Let's be clear. Fat doesn't make you fat, and it doesn't make you sick. According to Walter Willett, M.D., M.Ph, Chairman of the Department of Nutrition of the Harvard School of Public Health, the percentage of fat in the diet has no relationship to any major health outcome (but the type of fat—and the type of carbohydrate—does!) As long as you eat the right fats, (which means a healthy balance of omega-3s, omega-6s and saturated fats from whole foods like eggs and butter, while avoiding trans-fats) you'll be fine!