My biggest concern is an oxygen saturation level in the 70’s while I sleep. It is normal while I am awake. I have just started oxygen therapy while sleeping. Would losing a significant amount of weight help? I am 6’ 2” and weigh 252 pounds, so I qualify as obese; but I routinely walk 3.5 miles with no problem. I am 65 and want to live as active life as I can for 15+ years.