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Ten therapeutic and surgical patients aged 19-30 received rations composed of food concentrates during 9 days, their state of health was satisfactory during the whole follow-up period. The palatability of the food was highly appreciated by all the patients at the initial period of their feeding with concentrates, and the food was eaten up completely, it was only on day 7-8 that the patients complained of the "monotony" of the dishes proposed to them, especially, of milk foods. The data of the medical follow-up and physiological examination of the patients revealed no functional changes in their body. No allergic reactions were recorded. The patients were discharged from the hospital in due time.

An experiment was carried out on the volunteers who received during 3 weeks dinners composed of canned foods containing milk and vegetable proteins. Canned beef and mutton contained 33% of casein and 8% of soybean protein, 50% of casein and 14% of soybean protein were included into canned pork. During the whole period of the experiment the volunteers felt well and did accept the repeated dishes. The medical and physiological investigations showed no changes in their health and body function. No allergic reactions were recorded.

During 3 days 8 young volunteers received briquet food concentrates ready for use. The concentrates made up the pocket diet to be employed on an individualized basis. The mass of the diet was 600 g. It included 118.4 g protein, 39.9 g fat, and 370.8 g carbohydrates. The test subjects ate up their food appraising the gustatory qualities of the diet constituents. The loss of the body mass amounted to 0.77 kg during the first day, 0.22 kg during the second, and 0.19 kg during the third day of being kept on the diet. Medical and physiological studies did not reveal any substantial alterations in body function of the test subjects during the entire observation period. No allergic reactions were recorded.

Five healthy trained men aged 27-46 with a body weight approximating an ideal one were kept on a diet containing 95.4 g protein, 552.6 g carbohydrates and 81.3 g fat for 3 days, whereupon they received 1/3 of the indicated diet for 20 days. Energy losses averaged 2913 kcal/day. As a result of receiving the low-caloric diet (LCD), the body weight of the examined dropped from 75.8 to 70 kg. central nervous system function and higher nervous activity remained the same as shown by the reflexometry data, digital and corrections tests; the heart rate was 8-12 beats per minute lower in all the examined throughout all the observation periods both at rest and during exercise as compared to the respective characteristics of the adaptation period. The PWC170 value increased by 12-17% on the average. According to subjective data body function of the examined did not change substantially as a result of being fed the LCD.

Ten male volunteers received a low-caloric diet (LCD) (under 1200 kcal) containing 49.4 g protein, 28 g fat and 181 g carbohydrates for 3 weeks, with energy expenditure amounting to about 2900 kcal/day. During the time indicated, the body mass of the test subjects dropped by 7.1%. According to subjective data the well-being, physical and mental working ability remained unchanged in the test subjects. During feeding with the LCD and making the active orthostatic test, the increment of the heart rate upon the change of the body position appeared the same as that during the comparison period. Meanwhile on the 6th day of the recovery period the increment was significantly higher than at the comparison period. The systolic, pulse and mean arterial pressure, with the test subjects fed the LCD being in the vertical position and at the recovery period, was lower than at the comparison period. The data obtained attest to a definite lowering of the orthostatic stability of man kept on the LCD for a long time and at the recovery period, with this lowering taking place chiefly at the expense of changes in the tone of peripheral blood vessels.

Rats weighing 290 g each were fasting for 12 days with no changes occurring in the weight of the testicles, total lipids, phospholipids, di- and triglycerides content therein. The cholesterol ethers level increased by 53 per cent and in the composition of di- and triglycerides and the cholesterol ethers the relative content of high-molecular polyunsaturated fatty acids was going up, while the fatty acids composition of the phospholipids remained the same.

Eight physically trained male volunteers living in tropical countries were examined. Being under high physical load they were given the diet (for 3 weeks) containing food concentrates and canned food with a caloric value of 3860 calories. Energy expenditures amounted to 3600-4100 kcal/day. According to the physiological data the central and peripheral nervous systems and higher nervous activity remained unchanged throughout the entire observation period. As shown by the PWC170 test, the orthostatic stability and exercise tolerance were lowered at the initial period of the living in hot climate. Subjectively this was manifested by excessive fatigue toward the end of the working day. All the characteristics under study returned to normal by the 10th day of living in hot climate. The data obtained indicate that under the conditions of hot climate and appreciable physical loading, it is necessary to take into account the changes in body function in order to improve the diet for the people to be able to get adapted to the conditions in question.