The invention relates to the technical field of foods capable of reducing weight, and provides a fully nutritive food capable of reducing weight. The fully nutritive food comprises six components of aprotein composition, a fat composition, a carbohydrate and dietary fiber composition, a vitamin and mineral composition, a food addition agent and flavoured composition, and a functional compositionin the proportion of 1 to 1 to 1 to 1 to 1 to 1. Compared with the prior art, the fully nutritive food has the advantages that rich and quality animal and plant protein, healthy fat, rich dietary fibers, and minerals and vitamins, which are required by daily life of human bodies, are added. Functional substances are added, so that the fully nutritive food has strong satiety, can improve the immunity, the antioxidant ability and the weariness resistance of crowds needing to reduce weight, and can relieve the symptoms of reduced immunity, dizziness, weakness, insomnia, anxiety and the like of crowds reducing weight while realizing part of meal replacement functions.