This invention provides a composition and method for providing nutritional support to obese patients. The composition has an energy density between 0.4 and 0.9 kcal/ml and comprises a protein source which comprises at least 30% by weight whey protein and provides at least 30% of the total calories of the composition. The composition may include a carbohydrate source and a lipid source. Preferably, at least 50% by weight of the protein source is whey protein. The invention further extends to use of the composition in the prevention or treatment of malnutrition in obese patients.