A no-carbohydrate diet (no-carb diet, zero carb diet) excludes dietary consumption of all carbohydrates (including dietary fiber) and suggests fat as the source of energy with sufficient protein. A no-carbohydrate diet may be ketogenic, which causes the body to go into a state of ketosis, converting dietary fat and body fat. the brain. Some bodily organs and parts of the brain still require glucose, which is tightly regulated by gluconeogenesis or by the conversion of glycerol from the breakdown of triglycerides. A no-carbohydrate diet may be used, but it is not prescriptive of the diet, which, by definition,
An early proponent of an animal-based diet was Icelandic-Canadian explorer Vilhjalmur Stefansson (1879-1962), who lived with the Inuit for some time and their diet, with very few carbohydrates-just berries during the summer. However, the accuracy of its analysis has been reduced to approximately 15-20% of its calories are from carbohydrates, largely from the glycogen found in the raw meats. Stefansson and a friend later volunteered for a one-year experiment at Bellevue Hospital Center in New York City to prove he could thrive on a diet of nothing but meat, fat meat, and international organs of animals. His progress was closely monitored and his experiments were conducted throughout the year. At the end of the year, he did not show any symptoms of ill health; he did not develop scurvy, which many scientists had expected to manifest itself only in the diet due to lack of vitamin C in muscle meat. However, Stefansson and his partner did not eat meat, but also fat, raw brain, and other types of offal. There is some question as to amount – if any – of raw brain, or other organ / offal eating by one or more of the mutton, with that being almost all fatty cuts. Carbohydrate-restricted diets gained great popularity, particularly in the Atkins Diet case, which emerged in 1972, thanks to Robert Atkins. While his diet is not a zero-carbohydrate diet, it does reduce carb intake to a ketogenic level in its initial stages (20 grams daily in induction, weekly increase of 5 grams thereafter), According to Atkins, this nutritional approach is more effective than low-fat, “high-carbohydrate diet”, which is highly controversial and much more controversial among healthcare professionals regarding drastic carbohydrate restriction.
* Not Eating Enough: Overcoming Underconsumption of Military Operational Rations (1995) “Chapter 16: The Functional Effects of Carbohydrate and Energy Underconsumption” Institute of Medicine (IOM)