QUESTION: Hi Dr. Zac, After eating fast food, I often feel bloated and sluggish. I’ve been hearing a lot from wellness influencers blaming seed oils like canola for inflammation and poor digestion. Is there any science behind this, or is it just another internet trend? – Dani, 32, Albury NSW
ANSWER: Hi Dani, I appreciate your skepticism about what you see online! Seed oils are getting a lot of attention, so let’s break it down. It’s more complicated than just what’s in your cheeseburger or salad dressing.
What are seed oils?
Seed oils come from seeds like canola, soybean, sunflower, and corn. They contain a lot of omega-6 fatty acids, specifically linoleic acid. The belief is that too much of this could lead to inflammation and discomfort.
But the science isn’t straightforward. A recent study on the health effects of vegetable oils showed mixed results. The oil type, processing method, and individual diets all play a part in outcomes.
Another study reviewed in Frontiers examined those with diabetes and found that some seed oils, like canola and flaxseed, could improve health markers, but again, results varied.
A larger study involving nearly 1,900 people published in Science Daily found that higher linoleic acid levels were actually associated with lower inflammation and better overall health. This challenges the idea that seed oils are bad for everyone.
So, who do you trust? The evidence is divided. Some studies suggest seed oils are fine, while others raise concerns. It’s essential to look at the whole picture.
Why does fast food make you feel bad?
Seed oils aren’t the only reason fast food can leave you feeling awful. Fast food often consists of ultra-processed ingredients, high salt, and unhealthy fats, alongside reused cooking oils. All of these factors can create oxidative stress in your body, making you feel bloated and sluggish.
Some nutrition experts say focusing too much on seed oils distracts from the broader issue—our reliance on nutrient-poor, highly processed foods. It’s also worth noting that repeatedly heating oils can produce harmful compounds, which might irritate your body more than fresh oils.
Dr. Zac’s tips for better eating:
- Prioritize whole foods over fast food.
- Use stable oils like extra virgin olive oil or avocado oil at home.
- Include omega-3 sources like salmon or chia seeds to balance dietary fats.
- Watch for other inflammation triggers like sugar, processed meats, and stress.
- Consider consulting a dietitian to identify potential gut issues.
Stay healthy, Dr. Zac
Have a question? Email askdrzac@drzac.com.au
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