Real Food Science

Category: Seed Oils & Inflammation

  • The Omega-6 Overload: Why Your Modern Diet Is Fuelling Chronic Inflammation

    If there is one nutritional shift that explains more about the chronic inflammation epidemic — and the worsening of menopause symptoms in women eating modern Western diets — than almost any other, it is this: the collapse of the omega-6 to omega-3 ratio.

    For most of human evolutionary history, people consumed omega-6 and omega-3 fatty acids in roughly equal amounts — a ratio of approximately 1:1 to 4:1. Today, the average Western diet delivers a ratio somewhere between 15:1 and 20:1 in favour of omega-6. That shift — driven almost entirely by the industrialisation of seed oils and the displacement of traditional whole food fats — has happened within the last 100 years. Our inflammatory biology has not caught up.

    For women in perimenopause and menopause, where the protective anti-inflammatory buffer of oestrogen is already withdrawing, this omega-6 overload does not merely contribute to background inflammation. It amplifies the hormonal transition itself — worsening hot flashes, intensifying joint pain, deepening brain fog, disrupting sleep, and accelerating the gut permeability changes that drive a cascade of further symptoms.

    Understanding the omega-6 to omega-3 ratio is not advanced nutritional biochemistry. It is one of the most practical and immediately actionable areas of nutrition science available to women in midlife — because shifting the ratio is largely a matter of swapping a handful of everyday foods.

    [Podcast Player Block — Episode: “The Omega-6 Overload — Why the Modern Diet Is Making Menopause Worse” — Real Food Science Podcast]

    Key Takeaways

    • The omega-6 to omega-3 ratio in the modern Western diet sits at approximately 15-20:1 — far above the 1:1 to 4:1 ratio at which human inflammatory biology evolved
    • Omega-6 and omega-3 compete for the same enzymes — when omega-6 dominates, the balance of inflammatory versus anti-inflammatory signalling molecules shifts decisively toward inflammation
    • For women in perimenopause and menopause, where oestrogen’s anti-inflammatory protection is declining, the omega-6 overload amplifies every inflammation-driven symptom
    • The primary driver of omega-6 overload is seed oil consumption — in cooking oils and throughout packaged foods
    • Shifting the ratio requires both reducing omega-6 intake and increasing omega-3 intake — the two levers work together
    • Measurable changes in the omega-6 to omega-3 ratio in cell membranes occur within four to eight weeks of sustained dietary change

    What Omega-6 and Omega-3 Fatty Acids Actually Are

    Before getting into the ratio and its consequences, it helps to understand what these fatty acids actually are and why the body needs both.

    Omega-6 and omega-3 are polyunsaturated fatty acids — fats with multiple double bonds in their carbon chain. They are classified as essential fatty acids because the human body cannot synthesise them and must obtain them from food. Both are required for normal biological function. Neither is inherently bad.

    The primary dietary omega-6 fatty acid is linoleic acid (LA) — found in high concentrations in seed oils (sunflower, corn, soybean, rapeseed), nuts, and to a lesser extent in animal products. The body converts linoleic acid into longer-chain omega-6 fatty acids, most significantly arachidonic acid (AA).

    The primary dietary omega-3 fatty acids are alpha-linolenic acid (ALA) — found in flaxseed, walnuts, and chia seeds — and the long-chain EPA and DHA found in oily fish and algae. The body can convert ALA to EPA and DHA, but this conversion is inefficient — typically only 5-10% — which is why direct dietary sources of EPA and DHA from oily fish are so important.

    The critical point is what each fatty acid is converted into. Arachidonic acid — the downstream omega-6 product — is the precursor for a family of pro-inflammatory signalling molecules called eicosanoids: prostaglandins, thromboxanes, and leukotrienes that drive inflammation, pain signalling, blood clotting, and immune activation. EPA and DHA — the downstream omega-3 products — are converted into a different family of eicosanoids that are anti-inflammatory, vasodilatory, and pro-resolving.

    Both families are necessary. The balance between them determines your inflammatory tone.

    The Enzyme Competition — Why the Ratio Matters More Than Absolute Amounts

    The reason the ratio between omega-6 and omega-3 matters so much is the enzyme competition that sits at the centre of both pathways.

    The enzymes that convert linoleic acid to arachidonic acid — delta-6-desaturase and delta-5-desaturase — are the same enzymes that convert ALA to EPA and DHA. When omega-6 massively dominates the diet, these enzymes are almost entirely occupied processing linoleic acid. Very little capacity remains for omega-3 conversion.

    The consequences are twofold. First, arachidonic acid accumulates — providing more raw material for pro-inflammatory eicosanoid production. Second, EPA and DHA production is suppressed — reducing the availability of anti-inflammatory and pro-resolving mediators. The inflammatory balance tips in both directions simultaneously.

    At a ratio of 4:1 or lower, these enzyme systems process both pathways adequately — producing a balanced inflammatory signalling environment. At the modern ratio of 15-20:1, the omega-3 pathway is effectively outcompeted. The result is a chronic pro-inflammatory state that is not driven by any acute immune challenge — it is simply the baseline of the modern dietary pattern.

    How the Omega-6 Overload Specifically Affects Menopause

    The omega-6 to omega-3 ratio influences inflammation throughout the body and across the lifespan. But for women in perimenopause and menopause, the effect is amplified through a specific interaction with declining oestrogen.

    Oestrogen has direct anti-inflammatory properties — it suppresses certain inflammatory cytokines, moderates immune cell activity, and reduces the conversion of arachidonic acid to pro-inflammatory prostaglandins. While oestrogen levels are adequate, the inflammatory consequences of a high omega-6 diet are partly buffered by this hormonal protection.

    As oestrogen declines during perimenopause, that buffering diminishes. The same omega-6 load that was producing manageable background inflammation at 38 now produces a more pronounced and more symptomatic response at 46. Women notice that symptoms they had barely registered — occasional joint stiffness, mild bloating after certain meals, a slightly slower cognitive recovery after poor sleep — suddenly become persistent, disabling, and disproportionate to any obvious cause.

    The omega-6 overload has not changed. The body’s ability to buffer it has.

    Specific menopause symptoms directly driven by the omega-6 to omega-3 imbalance include:

    Hot flashes. Prostaglandins derived from arachidonic acid — the downstream omega-6 product — directly modulate the hypothalamic thermostat. Elevated AA-derived prostaglandins narrow the thermoneutral zone, increasing the frequency of vasomotor responses. Multiple studies have found that women with higher blood omega-3 levels report fewer and less severe hot flashes compared to those with higher omega-6 levels.

    Joint pain and stiffness. Arachidonic acid is the direct substrate for the COX-2 enzyme — the enzyme that produces the inflammatory prostaglandins driving joint inflammation. This is the same pathway targeted by NSAIDs like ibuprofen. A diet chronically high in omega-6 provides the raw material for this pathway continuously. Shifting the ratio toward omega-3 reduces the substrate available for COX-2 and provides EPA and DHA as competitive inhibitors of the pathway itself.

    Brain fog and mood. DHA is a structural component of neuronal cell membranes — it makes up approximately 30-40% of the polyunsaturated fatty acids in the brain. When the omega-6 to omega-3 ratio is high, omega-6 fatty acids displace DHA from neuronal membranes, reducing membrane fluidity and impairing synaptic transmission. Reduced DHA availability correlates with worse cognitive performance, lower mood, and increased neuroinflammation — all contributors to the cognitive symptoms of perimenopause.

    Gut permeability. As covered in the leaky gut article, high omega-6 polyunsaturated fats — particularly their oxidation products produced under heat — directly disrupt tight junction proteins in the gut lining. EPA and DHA, conversely, support tight junction integrity and reduce the LPS-driven inflammatory signalling that follows gut permeability.

    Sleep quality. EPA and DHA influence the production of serotonin and melatonin through their effects on the tryptophan conversion pathway. Women with higher omega-3 status consistently show better sleep quality measures — earlier sleep onset, more restorative sleep, fewer wakings. The 2-3am waking pattern driven partly by nocturnal cortisol spikes is also moderated by omega-3’s direct cortisol-blunting effect at the pituitary level.

    The Two Levers — Reducing Omega-6 and Increasing Omega-3

    Shifting the omega-6 to omega-3 ratio requires working both levers simultaneously. Reducing omega-6 alone without increasing omega-3 improves the ratio but does not maximise the anti-inflammatory benefit. Increasing omega-3 without reducing omega-6 is partially effective but remains limited by enzyme competition.

    Lever 1: Reducing omega-6

    The primary omega-6 source in the modern diet is seed oils — used in everyday cooking and present throughout packaged foods. As covered in detail in the seed oils article and the hidden seed oils article, replacing seed oil cooking fats with olive oil, butter, and ghee produces the most significant single reduction in daily omega-6 intake available through dietary change.

    Packaged food audit comes second — most processed foods contain seed oils as a primary ingredient. Removing the highest-omega-6 packaged foods from your regular purchasing (granola made with seed oils, shop-bought hummus, flavoured crackers, processed dressings) makes a meaningful additional reduction.

    A typical woman eating a standard Western diet consumes approximately 20-30g of linoleic acid daily. Replacing cooking oils and eliminating the highest-omega-6 packaged foods can reduce this to 8-12g daily — approximately the level at which the ratio begins to approach a more physiologically appropriate range, assuming adequate omega-3 intake.

    Lever 2: Increasing omega-3

    The omega-3 target for meaningful anti-inflammatory effect in perimenopausal women is:

    • EPA and DHA combined: 2-3g daily — achievable through two to three portions of oily fish per week plus supplementation if needed
    • ALA: approximately 2g daily from plant sources as an additional contribution (walnuts, ground flaxseed, chia seeds)

    Oily fish is the highest-priority omega-3 source because it provides EPA and DHA directly — the biologically active forms that do not require the inefficient ALA conversion step. Salmon, mackerel, sardines, anchovies, and trout are the richest sources. Tinned sardines and mackerel are affordable, sustainable, and nutritionally equivalent to fresh.

    For women who do not eat oily fish, algae-based omega-3 supplements are the only direct plant-based source of EPA and DHA. These are produced from the same algae that fish consume — making them nutritionally equivalent without the fishy aftertaste.

    Ground flaxseed, walnuts, and chia seeds provide ALA — which converts to EPA at approximately 5-10% efficiency and to DHA at lower rates still. While these are valuable additions that contribute to overall omega-3 status, they should not be the sole omega-3 strategy for women seeking meaningful inflammatory benefit.

    Where Spices and Herbs Fit In

    Reducing omega-6 and increasing omega-3 addresses the fatty acid ratio directly. But there is a parallel dietary lever that works on the same inflammatory pathways through different mechanisms: the polyphenols and bioactive compounds in anti-inflammatory spices and herbs.

    Turmeric’s curcumin, ginger’s gingerol, rosemary’s rosmarinic acid, and the flavonoids in oregano and thyme all inhibit NF-κB — the master transcription factor of inflammatory gene expression — through mechanisms that overlap with and complement the omega-3 pathway. These compounds do not correct the fatty acid ratio, but they reduce the inflammatory signalling downstream of arachidonic acid regardless of the ratio — making them particularly valuable as a complementary strategy.

    For women working to shift their omega-6 to omega-3 balance, adding therapeutic amounts of anti-inflammatory spices to daily cooking provides an additional anti-inflammatory mechanism that compounds with the fatty acid rebalancing. The evidence behind the top ten anti-inflammatory spices and herbs — including specific effective amounts and the mechanisms behind each one — is covered in full in the Top 10 Anti-Inflammatory Spices & Herbs guide linked below.

    The Timeline — What to Expect as the Ratio Shifts

    The omega-6 to omega-3 ratio in cell membranes changes gradually rather than immediately — because membrane remodelling requires existing fatty acids to be replaced during normal cell turnover. Different tissues turn over at different rates:

    Red blood cells: 120-day lifespan — measurable changes in red blood cell fatty acid composition (the most reliable biomarker of dietary omega-3 status) occur over four to eight weeks of consistent dietary change.

    Neuronal membranes: Longer-lived — significant cognitive benefits from omega-3 rebalancing typically emerge over eight to sixteen weeks of consistent intake.

    Inflammatory signalling: More immediate — the reduction in arachidonic acid substrate for prostaglandin production begins within days of reducing omega-6 intake. Acute inflammatory markers can shift within two to four weeks.

    The practical implication is that the ratio shift is a sustained intervention rather than a quick fix — but one where most women begin noticing symptomatic improvements within two to four weeks, with deeper benefits continuing to accumulate over two to three months of consistent dietary change.

    Practical Weekly Omega-3 Target

    Here is a concrete weekly food plan that achieves the omega-3 target while contributing to omega-6 reduction simultaneously:

    Monday: Tinned sardines on rye toast with olive oil for lunch Tuesday: Salmon fillet for dinner — 100g provides approximately 2g EPA+DHA Wednesday: Ground flaxseed (2 tbsp) in morning porridge or yoghurt — approximately 3.2g ALA Thursday: Mackerel fillet for dinner — approximately 2.5g EPA+DHA Friday: Walnut handful with afternoon snack — approximately 2.5g ALA Saturday: Smoked salmon with eggs for breakfast Sunday: Sardine or tuna salad for lunch — or a second salmon dinner

    That weekly pattern delivers approximately 10-12g combined EPA and DHA across the week — well above the anti-inflammatory threshold — alongside a meaningful ALA contribution from plant sources. Combined with the cooking oil swap covered in the cooking fats article, this approaches the dietary pattern that research consistently associates with lower inflammatory markers and reduced menopause symptom severity.

    Free Resource: Identify Your Inflammation Triggers

    Before building out a full omega-3 strategy, understanding your personal inflammatory pattern helps you identify which symptoms are most directly driven by fatty acid imbalance versus other contributors.

    → Download the free Menopause Bloat Trigger Checklist — a five-minute checklist that identifies your personal inflammation and bloating triggers, including several directly linked to the omega-6 to omega-3 imbalance.

    Go Deeper: Top 10 Anti-Inflammatory Spices & Herbs

    The Top 10 Anti-Inflammatory Spices & Herbs guide covers the ten spices and herbs with the strongest evidence for reducing inflammatory signalling in perimenopausal and menopausal women — including the specific compounds, effective amounts, and how to incorporate each one into everyday cooking to complement your omega-3 strategy.

    FAQ

    Do I need to take fish oil supplements or can I get enough omega-3 from food alone? Two to three portions of oily fish per week provides approximately the same EPA and DHA as a daily 1-2g fish oil supplement. For women who eat oily fish regularly, food sources are sufficient. For those who eat oily fish rarely or not at all, a high-quality fish oil or algae-based supplement providing at least 1g combined EPA and DHA daily is a practical addition. Look for supplements with a third-party purity certification — omega-3 supplements vary significantly in quality and oxidation levels.

    Is the omega-6 to omega-3 ratio the same concern for vegetarians and vegans? Yes — and potentially more so, because plant-based diets often include significant amounts of omega-6 from nuts, seeds, and plant oils while relying on ALA for omega-3, which converts inefficiently. Vegetarians and vegans should prioritise algae-based EPA and DHA supplements, minimise seed oil cooking fats, and maximise ALA sources (ground flaxseed, chia seeds, walnuts, hemp seeds). The ratio concern is diet-pattern independent — it is the absolute balance that matters, not whether the foods are animal or plant based.

    What is the omega-6 content of olive oil — does it contribute to the overload? Extra virgin olive oil is approximately 73% monounsaturated oleic acid (omega-9) and approximately 10-11% linoleic acid (omega-6). While olive oil does contain omega-6, its content is significantly lower than seed oils (sunflower oil is 65% linoleic acid), and the oleic acid does not compete in the same enzyme pathways as omega-6. Olive oil does not meaningfully contribute to omega-6 overload when used as the primary cooking fat — which is why it is the recommended replacement in the cooking fat swap.

    How do I know if my omega-6 to omega-3 ratio is improving? The most accurate measure is an omega-3 index blood test — which measures EPA and DHA as a percentage of total red blood cell fatty acids. This test is available through several private health testing services and provides a baseline and progress measure. However, most women find that symptomatic improvement — reduced joint stiffness, improved sleep quality, better cognitive clarity — is a reliable proxy indicator that the ratio is shifting in the right direction, even without testing.

    Is there a point where omega-3 can be too high? Very high omega-3 intake — above 5g EPA and DHA daily from supplements — can have blood-thinning effects relevant to women on anticoagulant medications. At dietary levels from food (two to three portions of oily fish per week) and standard supplement doses (1-3g daily), there are no clinically significant adverse effects in otherwise healthy women. Discuss with your GP if you are taking blood-thinning medications.

    Sources

    • Simopoulos, A.P. (2016). An increase in the omega-6/omega-3 fatty acid ratio increases the risk for obesity. Nutrients, 8(3), 128.
    • Calder, P.C. (2017). Omega-3 fatty acids and inflammatory processes: from molecules to man. Biochemical Society Transactions, 45(5).
    • Lucas, M. et al. (2009). Ethyl-eicosapentaenoic acid for the treatment of psychological distress and depressive symptoms in middle-aged women. Menopause, 16(2).
    • Yehuda, S. et al. (2005). The role of polyunsaturated fatty acids in restoring the aging neuronal membrane. Neurochemical Research, 30(6-7).
    • Ramsden, C.E. et al. (2013). Use of dietary linoleic acid for secondary prevention of coronary heart disease. British Medical Journal, 346.
    • Blasbalg, T.L. et al. (2011). Changes in consumption of omega-3 and omega-6 fatty acids in the United States during the 20th century. American Journal of Clinical Nutrition, 93(5).
    • Peet, M. & Stokes, C. (2005). Omega-3 fatty acids in the treatment of psychiatric disorders. Drugs, 65(8).

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  • Seed Oils vs Olive Oil: Which Fats Are Actually Worth Cooking With After 40?

    The fat conversation has been confusing for decades. Low-fat was the answer, then it wasn’t. Saturated fat was dangerous, then maybe not. Olive oil is definitely good. Coconut oil is good, then bad, then complicated. Butter went from villain to acceptable. Vegetable oil was heart-healthy for thirty years before the research started pointing in a different direction.

    If you have been paying attention to nutrition advice over the past twenty years, you have almost certainly changed what you cook with at least twice — and you may still not feel confident you have it right.

    This article cuts through the noise. Not by giving you another opinion to weigh against the others, but by laying out the actual mechanisms — what specific fats do inside your body, under heat, and at the cellular level — so you can make decisions based on understanding rather than the latest headline.

    For women in perimenopause and menopause specifically, fat quality is not a peripheral consideration. The type of fat you cook with every day directly influences your inflammatory baseline, your oestrogen metabolism, your gut microbiome, and consequently the frequency and severity of almost every menopause symptom you are managing.

    Episode: “The Fat Conversation — What Actually Belongs in Your Kitchen After 40” — Real Food Science Podcast

    Key Takeaways

    • The critical distinction between fats is not saturated versus unsaturated — it is how stable the fat is under heat, and what it does to your omega-6 to omega-3 ratio
    • Seed oils are high in polyunsaturated omega-6 linoleic acid, which oxidises under heat and drives the omega-6 overload that amplifies menopause inflammation
    • Extra virgin olive oil is primarily monounsaturated oleic acid — stable under moderate heat, anti-inflammatory, and the best-studied fat in the world for long-term health outcomes
    • Butter and ghee are predominantly saturated fat — stable under high heat, no direct inflammatory effect, and rehabilitated by recent research
    • The smoke point of an oil matters less than its oxidative stability — a high smoke point seed oil is still producing aldehydes and oxidised lipids at lower temperatures
    • For women after 40, the fastest meaningful dietary change is replacing everyday cooking seed oils with olive oil, butter, or ghee

    Why Fat Type Matters More After 40

    In your twenties and thirties, your body had a robust anti-inflammatory buffer working largely behind the scenes: oestrogen. Oestrogen suppresses certain inflammatory cytokines, maintains gut lining integrity, supports joint lubrication, and moderates the HPA stress axis. Much of what the modern Western diet does badly in terms of inflammation was being quietly managed by this hormonal protection.

    As perimenopause begins — typically in the early to mid-forties — that buffer starts to withdraw. The same dietary inputs that produced manageable background inflammation in your thirties now produce a more pronounced response. The same omega-6 load that your body previously managed with modest symptoms now contributes to hot flashes, joint pain, brain fog, and gut permeability with greater frequency and intensity.

    This is why the fat conversation becomes specifically more important after 40. It is not that fat quality didn’t matter before — it did. It is that the consequences of poor fat choices are amplified in the absence of oestrogen’s protective effect, and the benefits of good fat choices are correspondingly more significant.

    What Happens to Fats Under Heat — The Mechanism Most People Miss

    The smoke point of a cooking oil — the temperature at which it begins to smoke and visibly degrade — is widely used as a proxy for cooking safety. High smoke point means safe for high-heat cooking. This is partly correct but significantly incomplete.

    The more important variable is oxidative stability — the resistance of a fat to chemical degradation when exposed to heat, light, and oxygen. Oxidative stability is determined primarily by the degree of saturation:

    Saturated fats have no double bonds in their carbon chain. No double bonds means almost nothing to oxidise. Butter, ghee, and coconut oil are extremely stable under heat — they can be used at high temperatures without producing significant oxidation products.

    Monounsaturated fats have one double bond. Extra virgin olive oil is approximately 73% monounsaturated oleic acid. One double bond means relatively low oxidation potential — olive oil is stable under moderate heat, though it degrades at very high temperatures over prolonged cooking.

    Polyunsaturated fats (PUFAs) have multiple double bonds. Sunflower oil is approximately 65% linoleic acid — an omega-6 PUFA with two double bonds. Each double bond is a site of potential oxidation. Under heat, light, and oxygen, PUFAs oxidise rapidly, producing a cascade of compounds: lipid peroxides, reactive oxygen species, and aldehyde compounds including 4-hydroxynonenal (4-HNE) and malondialdehyde (MDA).

    4-HNE and MDA are not benign byproducts. They are pro-inflammatory compounds that are absorbed from food, reach the systemic circulation, and directly drive oxidative stress and inflammatory gene expression. A 2015 study published in PNAS found that 4-HNE — produced in significant quantities when seed oils are heated — activates NF-κB, one of the primary transcription factors controlling inflammatory cytokine production.

    This is why the smoke point argument is incomplete. A refined sunflower oil has a smoke point of approximately 230°C. But at 180°C — the temperature of a typical frying pan — it is already producing meaningful quantities of 4-HNE. The smoke point tells you when the oil starts to look degraded. The oxidative chemistry begins at significantly lower temperatures.

    Extra Virgin Olive Oil — The Evidence Standard

    Extra virgin olive oil (EVOO) is the most studied fat in the history of nutrition research, and the evidence in its favour is among the most consistent in the dietary literature. Understanding what makes it different from both seed oils and other “healthy” oils matters for using it correctly.

    The fatty acid profile: EVOO is approximately 73% oleic acid (monounsaturated omega-9), 11% polyunsaturated (mostly omega-6 linoleic acid), and 14% saturated. The dominant oleic acid is stable under moderate heat and has no significant pro-inflammatory mechanism. More importantly, it does not contribute to the omega-6 overload that is the primary dietary driver of systemic inflammation.

    The polyphenol content: What distinguishes extra virgin olive oil from refined olive oil and from all other cooking fats is its polyphenol content — specifically oleocanthal, oleuropein, and hydroxytyrosol. Oleocanthal inhibits the COX-1 and COX-2 enzymes — the same enzymes targeted by ibuprofen — through an identical biochemical mechanism. A daily dose of 50ml of high-quality EVOO provides oleocanthal equivalent in anti-inflammatory effect to approximately 10% of the adult ibuprofen dose. This is meaningful cumulative anti-inflammatory activity from a dietary fat.

    Oleuropein and hydroxytyrosol are potent antioxidants that reduce oxidative stress, protect LDL cholesterol from oxidation, and support endothelial health — the health of blood vessel walls, which is directly relevant to the vascular component of hot flashes.

    The important qualifier — quality matters enormously: Not all olive oil is equal. The polyphenol content of olive oil degrades with refining, with age, and with poor storage. Refined olive oil — the kind sold in large, clear plastic bottles at the lowest price point — has had most of its polyphenols removed. Light olive oil has virtually none. The anti-inflammatory benefit of olive oil is primarily delivered by extra virgin, cold-pressed oil with a high polyphenol count.

    How to identify high-quality EVOO: look for a harvest or press date (not just a best-before date), dark glass or tin packaging, a country of origin (single-origin is generally higher quality than blended), and a peppery, slightly bitter finish when tasted — the bitterness is the oleocanthal.

    Butter and Ghee — The Rehabilitation

    For decades, butter was dietary public enemy number one — saturated fat, heart disease risk, avoid at all costs. The evidence that underpinned this position was the diet-heart hypothesis, promoted primarily by Ancel Keys’ Seven Countries Study from the 1960s, which showed a correlation between saturated fat intake and heart disease mortality.

    What subsequent decades of research showed is considerably more nuanced. The relationship between saturated fat intake and cardiovascular outcomes is far weaker in properly controlled studies than the original hypothesis suggested, and the replacement of saturated fat with polyunsaturated vegetable oils — the dietary intervention that followed — may have introduced a new problem rather than solving the original one.

    For the purposes of cooking fat and inflammation specifically, butter and ghee have three relevant properties:

    Thermal stability. Butter is approximately 65% saturated fat. Ghee, which is clarified butter with the milk solids and water removed, is approximately 62% saturated fat. Both are extremely stable under heat and produce minimal oxidation products even at high cooking temperatures. Ghee in particular — with its higher smoke point of approximately 250°C — is one of the most stable fats available for high-heat cooking.

    No omega-6 contribution. Butter and ghee contain minimal linoleic acid (approximately 2-3%) and therefore do not contribute meaningfully to the omega-6 overload. In a diet already managing omega-6 intake from packaged foods, this matters.

    Butyrate production. The short-chain fatty acid butyrate is found in butter and is also produced by gut bacteria fermenting fibre. Butyrate is the primary fuel source for colonocytes — the cells lining the gut — and directly supports gut lining integrity. For women with gut permeability concerns, dietary butyrate from butter is a useful adjunct to the fibre-based microbiome support covered in the 30-plants article.

    The nuance: dairy intolerance is common in perimenopausal women. If butter triggers digestive symptoms, ghee — which has the milk proteins and lactose removed — is usually well tolerated even by those sensitive to dairy. If both are problematic, olive oil covers the anti-inflammatory cooking fat needs adequately.

    Coconut Oil — The Complicated Middle Ground

    Coconut oil sits in a genuinely complicated evidence position and deserves an honest assessment rather than either uncritical promotion or reflexive rejection.

    Coconut oil is approximately 82% saturated fat — which makes it thermally stable and non-inflammatory in the omega-6 sense. Its primary saturated fatty acids are lauric acid and medium-chain triglycerides (MCTs), which are metabolised differently from the long-chain saturated fats in butter — absorbed more directly into the portal circulation and used preferentially for energy rather than stored.

    What coconut oil does not have is the polyphenol content that makes EVOO specifically anti-inflammatory. It is a stable neutral fat rather than an actively anti-inflammatory one. The research on coconut oil is genuinely mixed — some studies show favourable effects on HDL cholesterol, others show LDL elevation that some researchers find concerning.

    The practical position for women in perimenopause: coconut oil is a reasonable high-heat cooking option and a better choice than seed oils — but it should not replace olive oil as the primary everyday fat. Use it for baking, for high-temperature cooking where olive oil’s moderate smoke point is a limitation, or for flavour in dishes where its taste works. Use extra virgin olive oil as your primary cooking and dressing fat.

    Avocado Oil — The Practical High-Heat Option

    Avocado oil has emerged as a strong practical option for high-heat cooking specifically. It is approximately 70% monounsaturated oleic acid — similar to olive oil in fatty acid profile — with a smoke point of approximately 270°C. This makes it stable at higher temperatures than olive oil and significantly more stable than any seed oil.

    Its anti-inflammatory properties are less studied than EVOO’s but the fatty acid profile is genuinely comparable. For recipes requiring high-heat frying or roasting where olive oil’s lower smoke point may be a concern, avocado oil is the cleanest high-heat option available.

    The practical limitation is cost — avocado oil is significantly more expensive than olive oil or butter. For everyday cooking at moderate temperatures, olive oil and butter remain more economical choices.

    The Fats to Avoid — And Why

    Sunflower oil, rapeseed oil, corn oil, soybean oil, vegetable oil blends: These are all high in polyunsaturated omega-6 linoleic acid, oxidatively unstable under heat, and directly contribute to the omega-6 overload driving systemic inflammation. As covered in both the seed oils article and the hidden seed oils article, these oils are pervasive in packaged foods, restaurant cooking, and everyday kitchen oils. Replacing them with olive oil, butter, and avocado oil is the single highest-impact fat swap available.

    Margarine and vegetable spreads: Even those marketed as “heart-healthy” or “cholesterol-lowering” are predominantly seed oil blends — often partially hydrogenated, which produces trans fats — with added emulsifiers, colourings, and flavourings. They offer none of the anti-inflammatory properties of butter and all of the omega-6 burden of seed oils.

    “Light” or “refined” olive oil: As covered above, refined olive oil has had its polyphenol content removed. It behaves more like a neutral fat than an anti-inflammatory one. The extra virgin qualifier is not a marketing distinction — it is the difference between an oil with measurable anti-inflammatory properties and one without them.

    Vegetable shortening: Almost universally hydrogenated seed oil. Associated with all the concerns of seed oils plus the additional risk of trans fatty acids from the hydrogenation process. No redeeming properties for cooking.

    Practical Guide: What to Use When

    Cooking methodBest fatWhy
    Salad dressings, drizzling, finishingExtra virgin olive oilMaximum polyphenol delivery; no heat degradation
    Sautéing, everyday pan cooking (under 180°C)Extra virgin olive oil or butterStable at these temperatures; anti-inflammatory
    Roasting vegetables (180-200°C)Extra virgin olive oil or butterBoth stable at roasting temperatures for normal durations
    High-heat frying (200°C+)Ghee, avocado oil, or coconut oilHighest thermal stability; no degradation at high temperatures
    BakingButter or coconut oilSaturated fat stability; appropriate flavour profiles
    Cold applications (dips, raw sauces)Extra virgin olive oil or flaxseed oilMaximum polyphenol and omega-3 delivery without heat

    The Omega-6 to Omega-3 Ratio — The Bigger Picture

    Individual fat choices exist within the context of your overall omega-6 to omega-3 ratio — and that ratio is the primary dietary determinant of your inflammatory baseline. As covered in detail in the seed oils article, the optimal ratio is approximately 4:1 (omega-6 to omega-3) or lower. The modern Western diet delivers approximately 15-20:1.

    Cooking oil choices directly affect this ratio — replacing sunflower oil with olive oil reduces daily omega-6 intake significantly. But cooking oil alone does not complete the picture. The other side of the ratio — increasing omega-3 intake — requires regular oily fish consumption, ground flaxseed, walnuts, and potentially fish oil supplementation.

    The Quick Guide to Healthy Fats below covers the full omega-6/omega-3 picture, including the specific foods and amounts needed to shift the ratio meaningfully, alongside the complete fat-by-fat breakdown of every major cooking and dietary fat.

    Free Resource: Start With Your Personal Triggers

    Understanding which fats are working against your inflammation is most useful when you already have a clear picture of your personal symptom triggers. Some women respond most strongly to the seed oil swap; others find gut permeability or stress more significant. Identifying your pattern first helps you prioritise.

    → Download the free Menopause Bloat Trigger Checklist — five minutes to identify your specific triggers so you know exactly where to focus.

    Go Deeper: Quick Guide to Healthy Fats

    The Quick Guide to Healthy Fats gives you the complete fat-by-fat breakdown — every major cooking fat, dietary fat, and supplement fat, with the mechanism of action, the evidence quality, and the practical application for women in perimenopause and menopause specifically. Including the omega-6/omega-3 ratio explained, the hormonal fat section covering oestrogen and cell membrane health, and a definitive cook-with/don’t-cook-with guide.

    FAQ

    Is extra virgin olive oil safe to cook with, or does heat destroy its benefits? Extra virgin olive oil is stable for everyday cooking at temperatures up to approximately 180-190°C — the temperature range of most sautéing, pan cooking, and moderate oven roasting. At these temperatures it produces minimal oxidation products and retains meaningful polyphenol content. It begins to degrade at higher temperatures and over prolonged high-heat cooking. For temperatures above 200°C or extended high-heat applications, ghee or avocado oil are more appropriate. The idea that olive oil should never be heated is a myth — it is stable enough for all everyday cooking.

    What about the research saying saturated fat raises cholesterol and causes heart disease? The relationship between dietary saturated fat, LDL cholesterol, and cardiovascular outcomes is genuinely more complex than the original diet-heart hypothesis suggested. The most recent meta-analyses, including a 2020 review in the Journal of the American College of Cardiology, found that replacing saturated fat with refined carbohydrates or polyunsaturated omega-6 seed oils does not reduce cardiovascular risk and may worsen it. Replacing saturated fat with whole food sources of unsaturated fat — olive oil, nuts, fatty fish — does show cardiovascular benefit. The nuance matters. Butter is not the same as a diet of processed food high in both saturated fat and refined carbohydrates.

    I have been using cold-pressed rapeseed oil — is that the same as standard rapeseed? Cold-pressed rapeseed oil retains more polyphenols than refined rapeseed and has a better oxidative profile. Its omega-6 to omega-3 ratio is approximately 2:1, which is considerably better than sunflower oil. It is a better choice than standard vegetable oil but not equivalent to extra virgin olive oil, which has both superior polyphenol content and a more favourable fatty acid profile for inflammation specifically.

    Does the fat I use for cooking matter as much as what I eat overall? Cooking fat affects two distinct variables: the oxidised lipid load you consume with every cooked meal (directly inflammatory), and your daily omega-6 intake (cumulatively inflammatory over weeks and months). Both matter. Swapping cooking fat from seed oils to olive oil and butter is one of the fastest single dietary changes available because it affects both variables simultaneously, at multiple meals per day, every day.

    Sources

    • Cicerale, S. et al. (2012). Biological activities of phenolic compounds present in virgin olive oil. International Journal of Molecular Sciences, 13(1).
    • Beauchamp, G.K. et al. (2005). Phytochemistry: ibuprofen-like activity in extra-virgin olive oil. Nature, 437.
    • Grootveld, M. et al. (2020). Adverse toxic, oxidative and inflammatory effects of dietary lipid oxidation products. Antioxidants, 9(12).
    • Hamley, S. (2017). The effect of replacing saturated fat with mostly n-6 polyunsaturated fat on coronary heart disease. Nutrition Journal, 16.
    • Ramsden, C.E. et al. (2016). Re-evaluation of the traditional diet-heart hypothesis. British Medical Journal, 353.
    • Simopoulos, A.P. (2002). The importance of the ratio of omega-6/omega-3 essential fatty acids. Biomedicine & Pharmacotherapy, 56(8).
    • Guasch-Ferré, M. et al. (2014). Olive oil intake and risk of cardiovascular disease and mortality in the PREDIMED Study. BMC Medicine, 12.

    Related Articles

  • Are Seed Oils Inflammatory? What the Science Says

    Are Seed Oils Inflammatory? What the Science Says

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    Simple olive oil swaps

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    Are seed oils really as harmful as social media claims? In this episode, we cut through the noise and go straight to the science — because your health decisions deserve better than a viral post.

    Seed oils like sunflower, canola, and soybean have been called everything from “toxic” to the root cause of chronic inflammation. But a landmark 2025 study of nearly 1,900 people found the opposite: higher levels of linoleic acid — the key fat in seed oils — were actually linked to lower inflammatory markers and better cardiometabolic health.

    In this episode we cover:

    → What omega-6 fatty acids actually do in your body (and why the “pro-inflammatory” label is a misunderstanding)

    → What 15 randomised controlled trials consistently found about seed oils and inflammation

    → Why ultra-processed foods — not the oils in them — are the real concern

    → The omega-3 to omega-6 ratio debate, and the one simple shift that actually helps

    → Which oils are best for everyday cooking on an anti-inflammatory diet

    Whether you’re navigating perimenopause, managing your energy levels, or simply trying to eat in a way that supports long-term health — this episode gives you the clarity you need to make confident, evidence-based choices in the kitchen.

    📖 Read the full article with references at vitalityandwellness.com

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    Resources mentioned:

    • Frontiers in Nutrition systematic review (2025)

    • American Society for Nutrition NUTRITION 2025 conference findings

    • British Journal of Nutrition perspective on plant oils (2024)

    • Framingham Heart Study omega-6 analysis (2025)

    —

    🌿 Vitality & Wellness is hosted by Stephanie Johnson — helping women aged 35–55 eat in a way that reduces inflammation, supports hormonal health, and builds lasting energy. New episodes every week.

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    Read the full article:

    https://realfoodscience.com/are-seed-oils-inflammatory