Rather the opposite: Being underweight would affect your immune system, by definition: any person below 70% of his/ her expected body weight is immune compromised, primary immune deceficiency diseases that cause malnutrition due to severe infections are rare and mostly in infancy, see an allergist/immunologist to check on your immune system if you wish, look up aaaai.org or acaai.org to locate an allergist in your area
Answered 10/5/2015
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