1. A Harvard anthropologist lived with and studied the Inuit people from 1905-1917, finding that their diet consisting primarily of meat and fat did not make them ill. 2. In 1928, the anthropologist underwent a 12-month experiment where he only ate meat and fat to prove it was healthy, and remained healthy. 3. A ketogenic diet high in fat and low in carbs (under 50g per day) can put the body into a state of ketosis, burning fat for energy, without negative health effects.