This is true and is good advice in general, but we should not forget that we are finding more and more cases of sleep apnea in thin, (oftentimes young) Asian males. My husband, for instance, has a severe case of sleep apnea and his bmi is less than 21! He hardly needs to lose weight. This is not to say that those who are overweight and who have been diagnosed as having sleep apnea should not lose weight: they should and might find relief in symptoms, better quality sleep, etc. if they do. It is it to say, however, that those who have normal or low BMIs should not automatically assume they need to lose weight merely because they have sleep apnea. In some of the newer populations identified with sleep apnea (such as smaller people who have smaller airways, which is what is believed to be a contributing factor in the frequency with which the disorder occurs in small Asian men), weight loss is not always necessary or even prudent due to their already low BMIs.