Some people think that it is even more healthful to restrict their diets to fruits.
They are worng. Foods contain nutrients, such as carbohydrates, proteins, fats, vitamins, minerals and phytochemicals that you need to remain healthy. You can't get all the nutrients that you need just from fruits. Fruits are loaded with carbohydrates and many different minerals, vitamins and phytochemicals, but they are relatively poor sources of vitamin D, protein and iron. Fruits, vegetables, whole grains and beans contain thousands of phytochemicals which help to prevent diseases.