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The average human body is roughly 60 percent water, 15 percent protein, and 15 percent lipid, with the remaining 10 percent comprised of various trace elements.
Dietary guidelines first published in 1945 by the National Academy of Sciences recommend a water intake of 2.5 liters per day, but while those figures are roughly estimated and widely disputed, thirst is an irrefutable indicator of personal hydration needs.
INFORGRAPHIC VIA STAYINGHEALTY.ORG
Personal dietary needs are more complex, and simple hunger will reveal little about specific nutritional requirements, but a better understanding of how essential nutrients function in the body can provide the backbones of a balanced diet and help to make sense of seemingly arbitrary cravings.