I get this question all the time from just about everyone who learns I’m a dietitian. My first response always is that if you’re replacing saturated fats from butter with a liquid vegetable oil or trans-free tub margarine, you’re already ahead of the game. But, of course, you can take it a step further and ask which oils amongst the vegetable oils are best? Olive, canola, walnut, flax, peanut, corn, soybean, sunflower, safflower…. A new study is helping us get to the correct answer, especially when it comes to pregnant women. The study found that pregnant and lactating mice fed a diet rich in corn oil gave birth to female babies at a higher risk of developing breast tumors than those who ate a diet high in canola oil. The difference may be due to a higher proportion of omega-3 fats in the canola oil vs corn oil. Keep in mind this is one animal study, says nothing about the other types of oils and there are lots of other studies that show benefits of many of the other oils. So, how do I answer the question I am so frequently asked? I say ”I personally use canola oil in baking and other recipes where no flavor is desired and extra virgin olive oil in sauteeing, when I want the flavor to come through. And if you choose to use flaxseed, walnut or any other oil in cooking to impart a particular flavor, those are good too. Most importantly, remember that it is recommended that you stick to only 5-8 teaspoons of oil per day (this includes any added fats, in cooking, spread on, dipped in, etc). So, keeping portion size under control is the most important factor of all.”
Tags: breast tumors, butter, canola, corn, flaxseed, oil, olive, walnut