The invention relates to a nutritional composition comprising dietary fibre, a peptide having 7 or more amino acid units, the nutritional composition comprising a tryptophan source, which may be said peptide or different there from, for use in the treatment of a negative emotion or introvert behaviour. The invention further relates to a combination of dietary fibre, a peptide having 7 or more amino acid units, the nutritional composition comprising a tryptophan source, which may be said peptide or different there from, and optionally one or more other components, for use in the treatment of a negative emotion or introvert behaviour.
