This type of diet can only be followed for a certain amount time before it starts taking it's toll on your system.
Coach,
How so? This type of diet is derived from the evolutionary diet of humans. It was also popularized in the mid 1800's, and was called the Banting Diet,
http://www.second-opinions.co.uk/banting.htmlA interesting study of the Inuits' (Eskimos) diet proved a high fat, high protein diet is all you need to live:
"Real-life tests
In 1906, Dr. Vilhjalmur Stefansson, a young Harvard anthropology teacher who later became a world-famous explorer and anthropologist, revolutionised polar exploration by crossing the Arctic alone and living off the land with the Eskimos. It was not quite what had been planned. Stefansson had gone on ahead of the Leffingwell-Mikkelson Expedition and had missed a planned rendezvous at Herschel Island. He was left to spend an Arctic winter with the Eskimos eating a diet composed only of meat and fish. Unlike the diet he had been brought up on, it contained no plant material whatsoever.
It was a golden opportunity for the young scientist to conduct an experiment into the effects of an Eskimo diet on a European unaccustomed to it. The usual Eskimo meal consisted of briefly stewed fish washed down with water. It was so different from what he was used to that at first Stefansson was repelled by it. To try to make the fish more palatable, he tried broiling it. This resulted in his becoming weak and dizzy, with other symptoms of malnutrition. Stefansson reasoned that with such a restricted diet the body had to have not just the fish but the other nutrients that had been leached out into the water. And so he tried harder. Eventually he became so accustomed to the primitive diet that, by the time he left the Eskimos, Stefansson managed as well as them. On this regime, Stefansson remained in perfect health and did not get fat.
The experience had a profound effect on Stefansson. Like Banting before him, he became interested in the possibilities of diets high in proteins and fats and low in carbohydrates. It seemed to him that a balanced diet in which there was relatively little meat, 'balanced' by larger amounts of potatoes, bread, rice and other starchy foods followed by sweet desserts and sugared coffee might be balanced in the wrong direction. And so, like Banting, Stefansson questioned the established ideas on diet. Unfortunately, he had no more success than Banting. Although he became famous and his position as an anthropologist was unassailable, still no one took any notice of his ideas on nutrition.
Some years after his first experience with the Eskimos, Dr. Stefansson returned to the Arctic with a colleague, Dr. Karsten Anderson, to carry out research for the American Museum of Natural History. They were supplied with every necessity including a year's supply of 'civilised' food. This they declined, electing instead to live off the land. In the end, the one-year project stretched to four years, during which time the two men ate only the meat they could kill and the fish they could catch in the Canadian Arctic. Neither of the two men suffered any adverse after-effects from their four-year experiment. It was evident to Stefansson, as it had been to Banting, that the body could function perfectly well, remain healthy, vigorous and slender if it used a diet in which as much food was eaten as the body required, only carbohydrate was restricted and the total number of calories was ignored"
