The acid ash diet is not a fad, but rather a medically prescribed diet for those who suffer from kidney stones. An indication that the diet is needed is kidney stones.

An alkaline ash diet has plenty of fruits, milk and vegetables, but minimal fish, meat and cereals. Such a diet yields an alkaline waste product after digestion. An acid ash diet comprises of cereals, meat, fish and eggs but minimal vegetables and fruits. The excreted end products of digestion are acidic. An acid ash diet especially one with a lot of gluten predisposes an individual to health problems.

Milk and milk products, vegetables and fruits should be avoided when following an acid-ash diet because when they are metabolized, they leave acid residue in the body to be excreted in the urine. Acid-ash diets typically consist of large amounts of meat, fish, eggs and cereal.

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usually in the case of UTI