The Importance of starch in the human diet is greatly underestimated by many advocates of living food lifestyle. Starch is definitely the staff of life. Fruit foods are not able to provide sustainable energy. They are body cleansers, not body builders.
Vegetable foods are the body builders.
The human body is not ideally suited to a predominately fruit diet, despite some theories to the contrary. Too much reliance on fruit foods can result in moderate to severe mood swings, mental disorientation, physical coldness, constant cravings and abnormal weight loss. Fruit foods temporarily elevate the blood sugar level and are easy to digest, they can provide the illusion of health and well being. The blood-sugar highs produced by excessive fruit consumption can become physiologically and psychologically addictive. Unfortunately, people who eat predominately fruit diets often suffer from progressive nutritional deficiencies which may not become evident for months or years.