A diet composition for managing body weight including effective amounts of Garcinia cambogia extract, Gymnema sylvestre extract, chromium picolinate, vanadium compound, L-carnitine, and conjugated linoleic acid. The daily effective amounts are administered in three approximately equal doses in conjunction with the daily meals. The diet composition is also administered in conjunction with a restricted-calorie diet. The diet composition optionally includes effective amounts of kola nut extract, dehydrated parsley, and lemon bioflavonoids.