The article discusses dietary studies on the relationship between carbohydrate versus fat-based diets and their effects on heart disease and weight. The studies have inspired much controversy. A Harvard School of Public Health study says that low-carbohydrate diets do not increase the risk of heart disease. But other scientists dispute the finding. Neither diet was particularly healthful, with the women on the low-fat diets eating too much sugar and other refined carbohydrates, while the women on the low-carbohydrate diet ate too much animal fat.