Alkaline Diet (also known as Acid Alkaline Diet, Alkaline Acid Diet, or Alkaline Ash Diet) is a dietary procedure based on the consumption of a selection of food, which burns in the body, and leaves ash. 

The incombustible ash or alkaline residue is composed of minerals rich in calcium, magnesium, iron, copper, and zinc. The burning, in comparison to the catabolism of food, produces waste.

There are three categories, in which the food is classified: alkaline, acid, and neutral. This is determined by the pH levels of the ash, when the diluted in water.

Alkaline Diets puts a large emphasis on eating a variety of fresh vegetables, citrus fruits, nuts, tubers, and legumes, and discourages the consumption of dairy products, grains, meat, and too much salt. The diet creates the minimal alkalinity in blood, ranging from 7.35 to 7.45.

This means the diet maintains the balance of acid-base homeostasis in the blood, which is the balance of acids and bases (commonly known as pH), in the body. Without this balance, the body is unable to sustain itself.