I was told that when we have bronchiectasis, just breathing causes us to burn more calories. So we need more calories to survive. I lost almost 30 pounds in the last year. I felt lousy and lost my appetite and my stomach shrunk. I'm at BMI 20 and make myself eat through the day. We need the reserves to help us through any exacerbation that may come. I had stopped dairy and sugar before this. Now I use coconut milk, coconut milk cheese, and coconut milk ice cream sweetened with stevia, and I've added back more poultry and some meat. I'm also eating some gluten-free pasta with alfredo sauce. And all of this just keeps me maintaining weight, not gaining. It takes 3500 excess calories to gain a pound. I wonder if my body is fully processing the food I eat. Good Luck and keep eating.