Human
In general, humans can survive for two to eight weeks without food, depending on stored body fat. Survival without water is usually limited to three or four days. About 36 million humans die every year from causes directly or indirectly related to starvation. Childhood malnutrition is also common and contributes to the global burden of disease. However global food distribution is not even, and obesity among some human populations has increased rapidly, leading to health complications and increased mortality in some developed, and a few developing countries. Worldwide over one billion people are obese, while in the United States 35% of people are obese, leading to this being described as an "obesity epidemic." Obesity is caused by consuming more calories than are expended, so excessive weight gain is usually caused by an energy-dense diet.
Hilton Hotema
In "Man's Higher Consciousness", Hotema wrote that man was designed to live 80,000 to 100,000 years, before his teeth and alimentary canal were subject to degeneration. It was published in 1952 as "Man's Miraculous Unused Power" using the pen name Kenyon Klamonti. George R. Clements (AKA Hilton Hotema, AKA Kenyon Klamonti) claimed he became a vegan at 9 years of age after reading a book about health at school. He said he lived as a breatharian-fruitarian for almost 80 years. He lived to 92 years of age." Hotema is documented in the book "The Struggle Between Religion & Science" by Marshall J. Gauvin.