Personalized methods of treating cancer

A method for treating a cancer in a subject in need thereof, the method comprising administering to the subject a therapeutically-effective amount of a dietary product, wherein the dietary product comprises at most about 0.5% (w/w) of cysteine or cystine, and wherein the dietary product comprises at least about 7.5% (w/w) of at least one essential amino acid selected from the group consisting of:

• methionine, histidine, isoleucine, leucine, lysine, phenylalanine, threonine, tryptophan, and valine, wherein the therapeutically-effective amount of the dietary product is from about 0.5 g/kg/day to about 1 g/kg/day,
• wherein the subject is undergoing a cancer therapy for the cancer,
• wherein the administering the dietary product to the subject increases efficacy of the cancer therapy in the subject by at least about 10% as compared to an efficacy of the cancer therapy in a comparable subject receiving the cancer therapy, but not the dietary product.