Abstract: Nutritious protein-containing foodstuffs can be prepared in the form of gels, including protein gel and fruit purees that contain all essential amino acids. A protein el for use as a foodstuff is prepared by heating an aqueous protein solution to between 160 and 185 degrees Fahrenheit at an acidic pH between 2.85 and 3.5, the protein solution having a viscosity greater than 100 centipoise and containing a protein at a concentration of 10-20% w/w, the protein being at least one of a whey protein isolate and a liquid soy protein isolate, the protein gel having a viscosity of between 10,000 and 1,000,000 centipoise.