Food is the building block of our bodies. We need proper nutrition through every stage of life to be at the best health possible. No matter what we eat, when we eat it, or how much of it we eat, all foods are broken down in the same way: into one of three major components. These components are protein, fats, and carbohydrates. It is a myth that calories from fat and calories from carbohydrates are different from each other – once the body breaks down foods, they are down to their basic components and will be used as energy immediately, stored for later use or stored as fat.

PKU is a genetic, metabolic disorder which prevents the body from oxidizing phenylalanine hydroxylase. As this chemical continues to build up, mental retardation, sometimes severe, may result, with very few of those with untreated PKU having an IQ over 50. It is important to have a low protein diet, which is the only way to remove the excess phenylalanine from the blood, and this diet should be started as early as possible to minimize the risk of mental retardation.