What is a gaps diet? Oh! I just googled it and it says that there are several foods that are available in the gaps diet. The gaps diet is apparently a useful and well used diet. Many people around the world identify with the gaps diet. Some of the foods that are on the diet include yoghurt and kefir. the diet is does not include any extra ordinary foods and it is mainly made up of common foods that are ideal for losing weight. Moreover, it also depends on the age of the individual. Separate diets are available for kids and adults as well.