Non-medical use of at least two components selected from the group of: (i) nucleoside equivalents, (ii) n-3 polyunsaturated fatty acids selected from the group of DHA, DPA and EPA, (iii) vitamins B, (iv) phospholipids, (v) antioxidants and (vi) cholines - with the proviso that at least one (i) nucleoside or at least one (iii) vitamin B is present - for increasing or maintaining the body weight, for improving the ability to perform an activity of daily living of a mammal, for maintaining the ability to perform an activity of daily living of a mammal, or for reducing a deterioration in the ability to perform an activity of daily living of a mammal.