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.
Famine events
During the event, for 30 hours, participants must abstain from eating food, and instead they typically drink water, fruit juices, or other liquids Games, fund raisers, and other events may also take place to help teach and educate the participants and others about world hunger all over the world. It is also a time for education and awareness of world hunger, and an understanding of how people go without food for long periods of time. This, however, does not exclude those unable to fast.