A new study suggests that both low-carb and low-fat diets can be effective for heart health, as long as the diet is high quality. The study's findings indicate that the type of diet may be less important than the overall quality of the diet in reducing cardiovascular risk. The research appears to show that both low-fat and low-carb diets can lower the risk of heart disease, with the key factor being diet quality rather than the specific type of diet.