FIELD: medicine; pharmaceuticals.SUBSTANCE: invention relates to the pharmaceutical industry, namely to a method for alleviating the symptoms of damage to beta cells of the pancreas in a subject. Said method for alleviating the symptoms of damage to beta cells of the pancreas of a subject, wherein the method comprising identifying a subject exhibiting symptoms caused by damage to the beta cells of the pancreas, wherein the subject has a normal calorie intake; and administering multiple cycles of a diet protocol to the subject, where in each cycle a fasting mimicking diet is provided during the first period of time from 2 days to 6 days, and a re-feeding diet is provided during the second period of time from 7 days to 85 days, while the fasting mimicking diet provides less than about 50 % of the normal caloric intake of the subject, both with protein restriction and with sugar restriction, includes at least 60 % of calories from fatty acids, 2-5 % of calories from glycerin, up to 5 % of calories from veget
