Healthy foods are those that provide you with the nutrients you require to maintain your body's health and energy levels. A healthy, balanced diet includes the following key nutrients: water, carbohydrates, fat, protein, vitamins, and minerals. A healthy diet rich in fruits, vegetables, whole grains, and a moderate amount of unsaturated fats, meat, and dairy can help you maintain a consistent weight. Having a good variety of these foods on a daily basis leaves less room for foods high in fat and sugar, which is a leading cause of weight gain.