See a doctor: It's more likely that you've have a lingering upper respiratory infection than 4 separate colds. Also, I believe you are calculating your BMI incorrectly. Nevertheless, if you are very under weight or anorexic, malnutrition can certainly contribute to a weakened immune system. If you are concerned about recurrent infections, you should get checked out by a medical provider.
Answered 1/10/2017
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