A healthy adult without special training can endure complete deprivation of food for 25-30 days, provided that water is available and physical effort is saved. But, a 1973 study by doctors at the University of Dundee School of Medicine, published in the Postgraduate Medical Journal, described a 27-year-old "severely obese" Scotland starving for 382 days in an effort to lose weight, which is ten times higher than normal.
Amazingly, the man managed to reduce his weight from 207 to 82 kilograms and remain in surprisingly good health. 5 years after extreme starvation, his weight remained stable at 88 kilograms.
Throughout the hunger strike, the man did not eat any solid food, although he was given potassium and sodium supplements, vitamins, and a small amount of yeast (which contains protein). And if you are wondering about bowel movements, doctors note that he defecated once every 37–48 days.
The man regularly visited the hospital for blood and urine tests to check blood glucose levels and plasma electrolyte concentrations. Although these rates declined over time, he managed to maintain remarkably good health and a cheerful mood.
“Despite hypoglycemia [low blood sugar], the patient remained asymptomatic, felt good and walked normally,” the report said.
And here we come to the heart of my question: how should the human body be changed in order to be able to fully do without food (additives) for a long time, like this person?
So when we eat regularly throughout the day, our body gets most of its energy from glucose in the blood and liver. Cells use this glucose to synthesize ATP, a molecule that carries energy into cells.
If there is no glucose in the blood or in the liver, we can also make it from glycogen, a polysaccharide formed by residual glucose that accumulates in the liver and muscles until needed. In addition, the body can break down body fat into glycerin, which can eventually be converted to glucose, and free fatty acids, which can be converted to ketones.
Since the man had an extremely plentiful supply of glycerin in his body fat, he was able to survive this latter process for a surprisingly long time with a little help from supplementation.
The latter is precisely the problem, because if it were not for potassium, sodium and yeast supplements, which are necessary for the biological functions of the body. For example, potassium is absolutely essential for nerve impulses and muscle contractions, along with many other processes in the body (this just needs to be corrected somehow).
Note: a person should lead a relatively normal life, except, of course, large expenditures of energy, such as marophons and other sports activities.