I’m writing en route from Boston to Seattle, where I’ll be living for about a month, attempting to keep (well, return to) a regular work schedule while participating in a family member’s effort to regain health. As departures from routine often do, I’ve encountered a couple of surprises during the journey. The first one isn’t so surprising, actually, given the prevalence of overweight in America; for those of you keeping score, the estimate is 145 million American adults, two out of every three of us.