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science of fitness
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All humans have to eat food for growth and maintenance of a healthy body, but we humans have different requirements as infants, children (kids), teenagers, young adults, adults, and seniors. For example, infants may require feeding every four hours until they gradually age and begin to take in more solid foods. Eventually they develop into the more normal pattern of eating three times per day as young kids.
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How active do adults need to be to gain some benefit?
Physical activity does not need to be hard to provide some benefit. Participating in moderate-intensity physical activity is a vital component of a healthy lifestyle for people of all ages and abilities. There is no demographic or social group in America that could not benefit from becoming more active.