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.
Blood &amp; Water
Adam's best friend of five years, Joshua, and his lover, Nicole, tell him that they are vampires, and want to turn him into one to save his life. Adam is frightened, but they explain that vampires are not villains who attack innocent humans, and only drink animal blood, because human blood turns vampires into irreversible psychotics that the vampire community must then "take out". Although crosses and daylight are not fatal to them, they are sensitive to light, and wear sunblock and sunglasses regularly. They are immortal (Nicole is 278 years old), never become sick, and have five times the strength of humans, though they can die if they bleed to death or experience massive tissue loss.