I would like to add a few more remarks on this. This has been called 'rabbit starvation' and it is believed that eating only lean meats is detrimental to your health because:
- since there are no fats in your diet, you cannot get replenishments of the fat-soluble essential fatty acids (omega 3 and omega 6);
- proteins cannot provide enough calories for the body in harsh environments (such as when the climate is cold or when you are in a stressful/survivalist situation);
- the ammonia produced when breaking down proteins is toxic to the body and must be removed by taking in enough water, otherwise it won't be converted to urea.
So, even when you are experimenting in a simulated survivalist situation you still have to eat fat. Just mention this in case you become too venturesome...