For today’s edition of Dear Mark, we’ve got a three-parter. First, I try to help out Karson, a guy who’s trying to convince his osteoporotic, sun-starved mother to try a few lifestyle interventions that may improve her condition without coming off as smug. Hopefully I’m persuasive enough. Next, is it really possible to gain body fat on a caloric deficit, or is something else going on? And finally, Dawn seems to be doing everything right, but she’s not losing any more weight — weight that she feels should be coming off. What can she try next?