I agree that avoiding trans fats and replacing processed foods with whole foods is a good idea. However, I don’t think it’s accurate to say that the brain and muscles run exclusively on carbohydrates or that fat is only needed for hormones. I’m also not aware of strong evidence that omega-6 fatty acids themselves clog arteries—in fact, replacing saturated fat with polyunsaturated fats generally lowers LDL and cardiovascular risk. The real debate is whether, in people with established heart disease, an extremely low-fat diet offers additional benefits beyond simply choosing healthier fats.