We have been misguided about fat. More and more research shows that eating fat is actually healthy and it does not make you fat. A large new analysis in the medical journal The Lancet compared more than 135,000 people on low-fat and low-carb diets across 18 countries. The researchers found that low-fat diets were more likely to be linked with death from all causes, and found a higher likelihood of heart attacks and heart disease as well. People on low-carb diets, on the other hand, had significantly lower risk of both of these outcomes.