Read somewhere that a BMI of under 18.5 can lead to getting ill more often due to the immune system being less strong but how does weight contribute to your body being able to fight illnesses?
In: Biology
The causality is running the other direction. In general, you have to be malnourished or have some sort of illness in order to be that much underweight. The same thing that is making you underweight is compromising your immune system.
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