Diet and increased life span.
D000375:Aging; D000818:Animals; D002784:Cholesterol / Q000097:blood; D004032:Diet; D005247:Feeding Behavior; D006801:Humans; D008136:Longevity; D011506:Proteins / Q000378:metabolism; D014364:Tryptophan / Q000172:deficiency
D011506:Proteins; D014364:Tryptophan; D002784:Cholesterol