Cystine Stones contain cystine, a product of the amino acids cysteine and methionine. Amino acids are the building blocks of proteins. Thus the simplest way to reduce the amount of cystine in the body is to limit your intake of protein.
Certain foods may be chosen or avoided based on their methionine content. Fish and grains contain proteins that are high in methionine. Protein from pulses is low in methionine.
Excessively acidic urine encourages cystine stone formation. Raising the pH of the urine (or making it alkaline ) helps to dissolve a cystine stone.
Foods which help to raise the pH of the urine include vegetable juices, fresh vegetables and many fruits.