Can not eating eating enough/being underweight affect your breathing?!

Best Answer - Chosen by Voters

Yes, It can. I have had a lot of underweight friends who had breathing problems.

The simple answer is that it is possible. Malnutrition lowers your immune system, thus making it much easier for you to catch upper respiratory infections. In addition, the lack of nutrients slow your metabolism and mess with your heart rate. If it is severe enough, your muscles in your diaphragm will atrophy, which could also cause shortness of breath. If you are not breathing properly, it is serious, and you should seek medical attention.