
Cooking Oils to Avoid (and What to Use Instead)
Cooking Oils to Avoid (and What to Use Instead for Better Gut & Overall Health)
There’s a lot of confusion around cooking oils — which are healthy, which are not — and if you’re struggling with gut issues or other health challenges, this is something to take seriously.
For years, we’ve been told to ditch saturated fats and replace them with “heart-healthy” vegetable oils like sunflower or rapeseed. But the truth is, many of these widely used oils can actually harm your health — especially your gut. So, which oils should you avoid, and what are the healthier, safer alternatives?
Let’s break it down.
🚫 Cooking Oils to Avoid
The most commonly used oils that are best left on the shelf include:
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Vegetable oil
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Sunflower oil
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Rapeseed oil
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Palm oil
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Rice bran oil
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Any blends of the above
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Margarine (often made from a mix of these)
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Processed products containing vegetable oil (like salad dressings, sauces, snacks)
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It’d be impossible to include all you need to know in one blog, but the programme will have all you need to know to ensure you’re soothing your digestive system, whilst eating delicious and filling foods.
❗ Why These Oils Aren’t as Healthy as You’ve Been Told
1. They’re Highly Processed
Despite their natural-sounding names, most vegetable oils are ultra-processed. Unless it says “cold-pressed” on the label, the oil was likely extracted using harsh chemical solvents, then refined, bleached, and deodorised.
2. They May Contain Trans Fats
Some oils are chemically altered through a process called hydrogenation, which turns them solid at room temperature. This extends shelf life, but it also creates trans fats — widely known to increase the risk of heart disease and inflammation.
3. They’re High in Omega-6 (aka Inflammatory)
Vegetable oils are loaded with omega-6 fats. While we do need small amounts of omega-6, most people eat far too much — and not nearly enough omega-3, the anti-inflammatory kind. The result? A major imbalance that fuels chronic inflammation in the body.
4. They Oxidise Easily
When heated, many of these oils become unstable, breaking down into harmful compounds and increasing the production of damaging free radicals. This can irritate the gut lining and contribute to wider health problems.
✅ Better Choices for Cooking & Gut Health
Here are the oils and fats I recommend instead:
🫒 Extra-Virgin Olive Oil
Best for drizzling and salad dressings. Rich in heart-healthy oleic acid and antioxidants. Avoid using it at high heat due to its lower smoke point.
🥥 Coconut Oil
Great for high-heat cooking like stir-fries. It’s stable at high temperatures and packed with medium-chain triglycerides (MCTs) that support metabolism and brain function.
🥑 Avocado Oil
Another excellent choice for cooking. It has a very high smoke point and is loaded with monounsaturated fats and antioxidants.
🧈 Grass-Fed Butter or Ghee
If you eat dairy, these are nutrient-dense, flavourful options. Grass-fed varieties contain more omega-3 and CLA (conjugated linoleic acid), which supports metabolic and gut health.
🦆 Animal Fats (e.g., Goose Fat, Lard, Tallow)
For non-vegans, traditional fats like goose fat are incredibly stable at high heat and often better tolerated by the gut than processed oils.
💬 Want Personalised Advice?
If you’d like help improving your gut health — from what you eat to how you cook it — I’d love to hear from you.
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