because its nice and shiny because your eye changes in light pepoils and brain comes in because through your eye is your brain
The answer is: "social epidemiology" .
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" <u> Social epidemiology </u> i<span>s the study of the causes and distribution of health, disease, and impairment throughout a population."
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Malnutrition is not having enough of the needed nutrients (not having a good diet, eating a lot of unhealthy food but still eating) this could be from either under consumption or over consumption. While under-nutrition is when someone eats an inadequate amount of food for an extended period of time (not eating enough food in general).