To obtain a nutriment absorption promoter that promotes intake of nutriments in foods through the alimentary canal by its oral administration, thus significantly increases the body weight, and is of high safety.

This nutriment absorption promoter comprises, as active intredient(s), a liposome that contains sterol and/or sterol glucoside. In this promoter, the sterol is one or more kinds selected from citosterol, campesterol, stigmasterol and brassicasterol, and the sterol glycoside is selected from sitosteryl-D-glucoside, campesteryl-d-glucoside, stigmasteryl-D-glucoside, and brassicasteryl-D-glucoside.