Keep in mind that maintaining an appropriate body mass index (BMI) is one of the greatest way to help keep your lungs healthy - not that any of us here have healthy lungs...but it will help to maintain what health we have left. Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. You can Google "body mass index" and get yours calculated and/or find out what your ideal BMI should be. I had to gain weight to achieve the appropriate BMI. I hated doing it - no more flat tummy and couldn't fit into my clothes anymore, but I will trade that for maintaining what little health I have left in my lungs any day. Linda