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The current issue of the Loma Linda support groups newsletter has two interesting commentaries by nutritional biochemist Dr. Richard Hubbard. first, he advocates that vegetable protein is preferable in PWP diet to animal protein because it contains less leucine which competes for absorption of levodopa. adequate intake of tryptophan or niacin is also mentioned. second, he states that excessively high levels of carbidopa can interfere with the body's ability to make niacin from the amino acid tryptophan. -- Ron Vetter 1936, '84 PD dz [log in to unmask] http://www.ridgecrest.ca.us/~rfvetter