The Classification
The Four Families of Dietary Fat
All dietary fats are made of fatty acid chains. Their chemical structure — specifically the number of double bonds between carbon atoms — determines how they behave in the body, how they affect your ldl receptors, and whether they end up protecting or damaging your arteries. Structure determines destiny.
⛔ Avoid entirely
trans fats
Industrially hydrogenated oils
Industrially hydrogenated oils
↑↑ LDL · ↓↓ HDL · ↑ Triglycerides
The only dietary fat with no safe level of consumption. Made by forcing hydrogen atoms into liquid vegetable oil — a process that creates misshapen fatty acid structures the body cannot handle. Raises ldl and simultaneously lowers hdl — the worst possible combination for cardiovascular risk.
Partially hydrogenated oils
Old margarines
Some imported biscuits
Fried fast food (outside EU)
⚠ Reduce significantly
saturated fat
No double bonds — solid at room temp
No double bonds — solid at room temp
↑ LDL · → HDL (slight rise) · → Triglycerides
The primary dietary driver of elevated blood LDL. Works by suppressing ldl receptor expression on liver cells, slowing the clearance of LDL from the bloodstream. Not every saturated fatty acid behaves identically — stearic acid (from dark chocolate) is notably more neutral — but as a category, reducing saturated fat is the most important dietary move for LDL.
Coconut oil
Palm oil
Coconut cream & milk (full-fat)
Hydrogenated vegetable fats
Processed baked goods
✓ Actively beneficial
monounsaturated fat
One double bond — liquid at room temp
One double bond — liquid at room temp
↓ LDL · → HDL (neutral / slight rise) · → Triglycerides
The fat family with the clearest evidence for benefit with minimal trade-offs. Lowers LDL when it replaces saturated fat, without reducing HDL. Extra virgin olive oil — the richest source — also contains polyphenols that directly reduce oxidised ldl, providing cardiovascular protection beyond what the lipid numbers alone reflect.
Extra virgin olive oil
Avocados
Almonds & cashews
Hazelnuts
Rapeseed oil
Peanut butter (natural)
★ Prioritise daily
polyunsaturated fat
Multiple double bonds — always liquid
Multiple double bonds — always liquid
↓ LDL · → HDL · ↓↓ Triglycerides (omega-3)
Divided into omega-6 fatty acids and omega-3 fatty acids. Both lower LDL when they replace saturated fat. Omega-3s additionally and powerfully reduce triglycerides, lower systemic inflammation and reduce platelet aggregation — making them the most cardioprotective fat family overall. The ratio between omega-6 and omega-3 intake matters — see below.
Walnuts (omega-3)
Flaxseed & chia (omega-3)
Hemp seeds (omega-3)
Algae oil (omega-3)
Sunflower seeds (omega-6)
Pumpkin seeds (omega-6)
The key nuance on coconut oil: heavily marketed as a
"healthy fat" due to its medium-chain triglyceride content,
coconut oil is approximately 90% saturated fat.
Multiple meta-analyses have confirmed it raises ldl significantly. There is no credible clinical evidence it is
cardioprotective. Use sparingly in cooking if you enjoy the flavour;
do not use it as your primary fat.
The Balance Problem
Omega-3 vs Omega-6 — Why the Ratio Matters
Both omega-3 and omega-6 fatty acids are essential — your body cannot make them and must obtain them from food. But they compete for the same metabolic enzymes, and their downstream products have opposing effects: omega-6 metabolites tend to be pro-inflammatory; omega-3 metabolites are anti-inflammatory. The balance between them shapes your baseline inflammatory state — which directly affects cardiovascular risk independently of cholesterol levels.
Omega-6 : Omega-3 ratio in the modern UK diet vs target
epa and dha (omega-3)
≥ 500mg / day
Daily algae-based EPA+DHA supplement — the direct plant source. Reduces triglycerides by 15–30% at therapeutic doses. The cleanest, most consistent way to meet this target on a plant-based pattern.
ala (plant omega-3)
≥ 1.6g / day (men) · 1.1g (women)
1 tbsp ground flaxseed, 1 tbsp chia seeds, or a small handful of walnuts daily. Contributes to total omega-3 intake; does not replace EPA/DHA.
Practical priority: you do not need to track omega
ratios obsessively. Adding a daily algae oil supplement, switching your
cooking oil to rapeseed or extra virgin olive oil, and sprinkling ground
flaxseed or chia onto your breakfast will move your ratio in the right
direction faster than any other single change.
The Best Sources
Top Omega-3 Foods — EPA, DHA & ALA
epa and dha are the long-chain omega-3s with the strongest cardiovascular evidence. While they occur naturally in oily fish, fish obtain them by eating algae — making algae oil the direct, plant-based source of preformed EPA and DHA. ala from plant foods contributes to total omega-3 intake but converts to EPA and DHA inefficiently. The table below covers the best whole-food and supplement sources available on a whole-food, plant-based eating pattern.
| Food | Serving | EPA + DHA | ALA | Notes |
|---|---|---|---|---|
| Algae oil supplement | 1–2 capsules | 500–1,000mg | — | The direct plant source of EPA and DHA — where fish get their omega-3 from. Best way to meet daily targets on a plant-based pattern. |
| Ground flaxseed | 1 tbsp (10g) | — | ~2,300mg ALA | Must be ground for bioavailability — whole seeds pass undigested. Add to porridge, smoothies or salad dressings. |
| Chia seeds | 1 tbsp (12g) | — | ~2,100mg ALA | No grinding needed. Swell in liquid — great in overnight oats or as an egg replacer. Also provide soluble fibre and calcium. |
| Walnuts | 30g (small handful) | — | ~2,570mg ALA | Also rich in plant sterols and arginine — triple cardiovascular benefit. The most omega-3-rich nut by a wide margin. |
| Hemp seeds | 3 tbsp (30g) | — | ~2,600mg ALA | One of the best omega-6:omega-3 ratios of any seed (approx 3:1). Also a complete protein source. Sprinkle on salads, porridge or soup. |
| Flaxseed oil | 1 tbsp (14ml) | — | ~7,200mg ALA | The most concentrated plant ALA source. Use cold only — never heat. Refrigerate and use within 4 weeks of opening. |
| Rapeseed oil | 1 tbsp (14ml) | — | ~1,300mg ALA | The best everyday cooking oil for ALA. Heat-stable enough for most cooking. Good omega-6:omega-3 ratio (~2:1). |
| Edamame (cooked) | 100g | — | ~600mg ALA | Whole young soybeans — also provide plant sterols, fibre and complete protein. A well-rounded cardiovascular food. |
The Practical Kitchen
Which Fats to Cook With — and Which to Avoid
The best fat for your health profile is only useful if it survives the cooking process intact. smoke point matters — heating a fat beyond it creates harmful breakdown products. Here is a practical guide to the most common kitchen fats, what they do to your lipids, and when and how to use them.
Extra Virgin Olive Oil
Smoke point ~200°C
★ First choice
Lowers LDL, rich in polyphenols that reduce LDL oxidation. Suitable for sautéing, roasting and dressings. The evidence base is unmatched.
Rapeseed Oil
Smoke point ~230°C
✓ Excellent choice
High in monounsaturated fat and the best plant source of ala. Neutral flavour. Good all-rounder for higher-heat cooking where olive oil's flavour is not wanted.
Avocado Oil
Smoke point ~250°C
✓ Great for high heat
Very high in monounsaturated fat. Best used refined for high-heat cooking. More expensive but genuinely the most heat-stable of the heart-healthy oils.
Coconut Oil
Smoke point ~175°C
Limit use
~90% saturated fat. Raises LDL significantly despite marketing claims. Acceptable for occasional Thai or South Asian cooking where the flavour is integral — not as a daily fat.
Sunflower / Corn Oil
Smoke point ~230°C
Use in moderation
Lowers LDL but very high in omega-6 fatty acids with almost no omega-3 — worsens the omega-6:omega-3 ratio. Not harmful in small amounts; just not the optimal choice when rapeseed or olive oil is available.
Flaxseed Oil
Smoke point ~107°C — do not heat
Dressings only
The richest plant source of ala. Use cold only — on salads, porridge or smoothies. Degrades rapidly at heat and once opened. Keep refrigerated and use within 4 weeks.
Partially Hydrogenated Oils
Any temperature
Avoid entirely
Industrial trans fats. Now largely phased out in the UK, but still present in some imported products. Check labels for "partially hydrogenated" — if you see it, put it back.
The Hit List
High-Saturated-Fat Foods to Reduce or Replace
Saturated fat in a whole-food, plant-based eating pattern comes mainly from tropical oils and highly processed products — not from wholegrains, legumes, nuts or seeds. These are the plant-derived foods most worth being aware of if your LDL is elevated.
Coconut Oil
Approximately 90% saturated fat — the highest of any commonly used plant oil. Despite widespread marketing as a "healthy fat", multiple meta-analyses confirm it raises LDL significantly. The medium-chain triglyceride benefit is real but modest compared to the LDL cost at typical culinary doses.
↔ Swap: extra virgin olive oil or rapeseed oil for everyday cooking
Palm Oil & Palm Kernel Oil
Palm oil is ~50% saturated fat; palm kernel oil is ~82%. Both raise LDL comparably to butter. Hidden in an enormous range of processed foods — biscuits, crackers, ready meals, plant-based meat alternatives and chocolate spreads. Check labels carefully.
↔ Swap: choose products made with rapeseed, olive or sunflower oil instead
Full-Fat Coconut Milk & Cream
A tin of full-fat coconut milk contains around 24g of saturated fat — more than most people's entire daily saturated fat budget. Light coconut milk dramatically reduces this (around 7g). Used occasionally in curries and sauces, fine; used daily as a cooking base, it adds up.
↔ Swap: light coconut milk, cashew cream, oat-based cream alternatives
Pastries, Croissants & Shop-Bought Baked Goods
Made with palm oil, hydrogenated vegetable fat or butter — often without transparency on labels. The worst combine saturated fat and residual trans fats. Regular consumption is consistently associated with elevated LDL in population studies regardless of other diet quality.
↔ Swap: oat-based breakfasts, rye bread with nut butter or avocado
Milk & White Chocolate
High in saturated fat from cocoa butter plus added dairy fat and refined sugar (which raises triglycerides independently). Stearic acid in cocoa butter is more LDL-neutral than other saturated fats — but the milk fat and sugar additions shift the overall profile unfavourably.
↔ Swap: dark chocolate (≥ 85%) — rich in heart-healthy polyphenols, far less sugar
Ultra-Processed Snack Foods
Crisps, crackers, biscuits and snack bars made with palm oil, coconut oil or partially hydrogenated fats. Often marketed with health claims that obscure a poor fat profile. The combination of saturated fat, refined carbohydrate and salt makes these among the most counterproductive snacks for cholesterol management.
↔ Swap: a small handful of walnuts, almonds or pumpkin seeds — genuinely heart-protective
🫒 The Takeaway — Section 03
- Trans fats are the only fat with no safe intake level — largely banned in the UK now, but check imported products for "partially hydrogenated oils"
- Saturated fat raises LDL by suppressing LDL receptors — on a plant-based pattern the main sources are coconut oil, palm oil, full-fat coconut products and processed baked goods
- Monounsaturated fat (olive oil, avocados, almonds) lowers LDL without reducing HDL — the most favourable dietary fat swap available
- Omega-3 fatty acids powerfully reduce triglycerides and inflammation — get EPA and DHA from a daily algae oil supplement, and ALA from ground flaxseed, Chia seeds and walnuts
- The omega-6:omega-3 ratio in most UK diets is around 15:1 — aim for 4:1 or better by adding algae oil and ground flaxseed, and reducing reliance on sunflower and corn oil
- Extra virgin olive oil is the first-choice cooking and dressing fat — its polyphenols reduce LDL oxidation independently of fat type effects
- Replacing coconut oil with olive or rapeseed oil is the single highest-impact kitchen swap for cholesterol on a whole-food, plant-based eating pattern