in the region where you are forced down. A continued diet of rabbit will produce rabbit starvation -- diarrhea will begin in about a week and if the diet is continued DEATH MAY RESULT." Physiology The U.S. and Canadian Dietary Reference Intake review for protein mentions "rabbit starvation", but concluded that there was not sufficient evidence by 2005 to establish a tolerable upper intake level, i.e., an upper limit for how much protein can be safely consumed. According to Bilsborough and Mann in 2006, protein intake is mainly restricted by the urea cycle, but deriving more than 35% of energy needs from protein leads to health problems. They suggested an upper limit of 25% or 2-2.5 g/kg, "corresponding to 176 g protein per day for an 80 kg individual", but stated that humans can theoretically use much larger amounts than this for energy. For arctic hunter-gatherers, the amount can seasonally increase to 45%. Protein intakes above 35% of energy needs have also been shown to decrease testosterone and increase cortisol levels. This is thought to be part of the body's attempt to upregulate the urea cycle, and increase nitrogen excretion. See also Atkins diet Country food / Inuit diet – Traditional diet of the Inuit and First Nations Christopher McCandless - an assumed protein poisoning victim Dukan Diet Kwashiorkor – Disease resulting from sufficient caloric intake with very low protein content Low-carbohydrate diet Marasmus – Disease caused by inadequate caloric intake Montignac diet Protein Power Protein toxicity – Damage caused by buildup of protein metabolic waste products in the bloodstream Proteopathy – Damage caused by misfolded proteins Scarsdale diet Stillman diet Sugar Busters! Zone diet References Further reading Malnutrition Carnivory Survival skills Proteins as nutrients