The alkaline diet (also known as the alkaline ash diet, alkaline acid diet, acid ash diet, and the acid alkaline diet) is a diet
based on the belief that certain foods, when consumed, leave an alkaline residue,
or ash, in the body. Elements such as calcium, iron, magnesium, zinc, and copper are
said to be the principal components of this "ash".
Alkaline-diet proponents thus classify foods as alkaline, acid or neutral according to the pH of the
solution created with its ash in water.