A few months ago a study titled “Effects of n−6 PUFAs compared with SFAs on liver fat, lipoproteins, and inflammation in abdominal obesity: a randomized controlled trial” was published in the American Journal of Clinical Nutrition. This study compared the effects of polyunsaturated fat, in the form of sunflower oil, with saturated fat, in the form of butter on various markers of health. The results of this study seem to indicate that saturated fat produces higher insulin, higher levels of inflammatory mediators, a worse lipid profile, and greater accumulation of liver fat. Ouch.
Still, I think there are some problems with this study that weakens it as evidence that saturated fat is bad and polyunsaturated vegetable oils are good. Continue reading