Introduced in Legend of Grimrock 2, several of the races are given a Favorite Food which grants permanent stat increases when eaten. Lizardmen have Turtle Eggs; Insectoids have Horned Fruits; Ratlings have Cheese; Humans and Minotaurs do not have any preferred food.
The first stat increase will occur after a character has eaten 3 pieces of their favorite food. After this, they will need to eat 4 pieces to gain a second stat increase. Each increase requires one more piece of food than the previous increase, and they eventually come to an end after the increase requiring 12 pieces, for a total of 75 pieces eaten. Although this could mean a total increase of 10 to a character's stats, the base game does not contain enough samples of any of the favorite foods for any character to reach this maximum.
Each stat increase is 1, and the stat increased is randomly selected. It is, however, impossible to save and restart for a particular stat to be increased; the selections are made upon character creation, and cannot be altered.