For years now, you've likely heard that canola oil is a healthier fat to use for frying, the best oil to cook with because of its high smoke point, and a better oil option for weight management. You've probably also read the "heart-healthy" labels found on vegetable oils in the grocery store.
But there is growing concern among nutritionists and researchers about the effects of highly refined seed oils on health.
These processed oils are in nearly everything. From junk food to products marketed as "healthy," they have made their way into kitchen staples like bread, cookies, soups, crackers, sauces, salad dressing, and more.
What Exactly is Canola Oil?
Canola oil is a refined oil that comes from the rapeseed flower. The seeds of these plants are harvested. The oils are then extracted using high heat. During this process, omega-3 fatty acids may be transformed into less stable forms. They are then processed with chemical solvents [1]. These refined oils may become more unstable when heated at high temperatures during cooking or baking.
Concerns About Refined Oils
The process of chemically treating oils remains similar across many refined oil products. They are heavily processed and heated.
Some concerns associated with excess consumption of refined seed oils include:
High levels of omega-6 fatty acids. When the ratio of omega-6 to omega-3 fatty acids is significantly imbalanced, this may contribute to a pro-inflammatory state in the body.
Some research suggests that diets high in refined oils may be associated with markers of cardiovascular risk, though more research is needed in this area.
Refined oils are calorie-dense and often found in ultra-processed foods, which may contribute to excess caloric intake.
Supporting Weight Management by Reducing Refined Oils
When clients want to support their weight management goals, education about healthy and unhealthy fats is one of the first things I address. This is an integral part of the Skinny Method™ clean-eating guidelines.
The Skinny Method™ teaches you how to make more informed choices about fats in your diet. Part of the method encourages reducing inflammatory oils and incorporating an "eat light to heavy" approach throughout the day.
The Best Cooking Oil for Weight Management
When it comes to cooking oils and weight management, less is generally more. While healthy fats like extra virgin olive oil, coconut oil, avocado, raw nuts, and seeds offer potential health benefits, these benefits are best realized when the fats are consumed in their raw, unheated form.
When I create meal plans for my nutrition clients, I emphasize minimizing the use of oils during cooking. If you do cook with oil, choose minimally processed options and use them sparingly.
Tips for a Seed-Oil-Free Lifestyle
Check the labels of everything you eat.
Eat clean snacks with simple ingredients.
Meal plan as often as possible (restaurants and prepared food almost always use seed oils).
Consider minimizing deep frying, stir-frying, or sauteing in refined oil.
Consider avoiding peanut oil, canola oil, safflower oil, sunflower oil, cottonseed oil, soybean oil, and all vegetable oils as much as possible.
Purchase extra virgin olive oil and avocado oil in dark glass bottles (to help preserve freshness).
Drizzle EVOO on your salad as a dressing base.
Consider minimizing heating any oil or fat when you cook.
References:
[1] Zacchi, P. & Eggers, R. (2000). Physical Refining of Edible Oils. European Journal of Lipid Science and Technology, 102(7), 472-477.
Disclaimer: This content is for informational purposes only and is not intended as medical advice. Always consult with a qualified healthcare provider before beginning any new dietary program, especially if you are pregnant, nursing, or managing a medical condition.
