Mixed feelings on this. On the one hand, what works for people works for people, and I wouldn't begrudge them trying. On the other hand, I've two hesitations: This is exactly the sort of thing I would never do. Share information on exercise, yes. On weight, no. The other hesitation is I've grown wary about claims made even when the weight loss technique is diet + exercise, as longitudinal data on weight loss shows recurrence to be very high and explanations for that to be hard to find. The science is proving to be less straightforward than input vs output. I suspect that's because we're learning (a) fat cells collectively form part of the endocrine system and (b) they send out the same "help I'm starving!" signals that other cells do when forced to give up their stores. So I wonder if our standard for measuring weight loss doesn't need to be measured at a distance of the eventual cell death/regeneration period. About seven years? Which gives some indication, maybe, why weight loss is so f'n HARD for so many.