Vegetarians claim that the body's requirements for vitamin A can be met with carotenes from vegetable sources, but many people — particularly infants,
children,
diabetics and individuals with poor thyroid function — can not make this conversion.7 Furthermore, studies have shown that our bodies can not convert carotenes
into vitamin A without the presence of fat in the diet.8 Dr. Price discovered that the diets of healthy isolated peoples contained at least ten times more vitamin A from animal sources than found in the American diet of his day.