Use of tryptophan rich protein hydrolysates

A method of increasing:

• a) a feeling of energy;
• b) cognitive functions selected from the group consisting of sustained attention, faster reaction times, and information processing;
• c) quality of sleep;
• or
• d) feelings of well-being and happiness in a healthy adult, wherein the method comprises administering to the healthy adult a pharmaceutical, food or food supplement comprising a hen egg lysozyme tryptophan-containing hydrolysate (Trp-containing protein hydrolysate) having a ratio (Trp/LNAA) of tryptophan (Trp) to large neutral amino acid (LNAA) of greater than 0.15, and wherein the dosage of the Trp-containing protein hydrolysate provides 10-100 mg of Trp per day.

A single dose composition which is a beverage, a beverage powder, a gel, or a sorbet comprising:

• a) less than 4000 mg per dosage of a hen egg lysozyme tryptophan-containing hydrolysate (Trp-containing protein hydrolysate) having a ratio (Trp/LNAA) of tryptophan (Trp) to large neutral amino acid (LNAA) of greater than 0.15;
• b) a sweetening agent;
• c) a flavoring agent;
• and
• d) optional extra nutritional ingredients.