The invention relates to a complete food product in the form of a powder or paste including proteins, lipids, sugars and minerals, having at least the following characteristics: a high energy value of at least 400 kcal/100 g, an osmolality greater than 100 mosm/kg, and the presence of monosaccharides amounting to at least 15% by weight of the total sugars present in the product. The invention also relates to a method for manufacturing said product and to the use of the same for fighting malnutrition.