Process for treating a food composition containing 0.01 to 15% w/w hydrophobin wherein a) the composition pH is first brought to between 1 and 4, preferably under 3.5 b) then the composition is heat treated at a temperature of at least 70° C. (preferably at least 100° C.) c) then the composition is brought to a pH of between 6 and 7.5.