When, in the history of you, have you ever done anything for brevity's sake? Re: metabolism changes. I had to adjust at 25 and then again at 45. Luckily my metabolism was through the roof to begin with...but it was recognizing those changes shortly after they occurred that kept me from getting too far down the rabbit hole. Many of my peers haven't made than change so they still eat like we did at 25...and it shows.