I am a D.O. in the U.S. who practices Sports Med. However, even if I were a weekend athlete, I would/should know that tracking "weight" (often, BMI) is nearly useless and not that with which I am truly concerned. It's 2014, and the subject of "weight loss" has been written about and studied ad nauseum and the study leaders still track weight when - unless they are concerned about, e.g., knee pain 2/2 osteoarthritis - they mean to track and refer to FAT. It is absolutely incredulous that at this point these "weight loss" studies are still being done, and perhaps worse, being peer- reviewed and published. To add weight, in the form of muscle, at any time in life, particularly as we age, is almost invariably desired (to maintain quality of life in the form of function, staving off various morbidities, and cosmetics). So, if these participants were exercising (any is better than none!) and they were putting on muscle, the recommendations/conslusions of this study are misleading and maybe even discouraging for those who do not have time to do more exercise than cited in the study. I am truly appalled that doctors - I am a doctor so feel free to speak about us a group of which I am one - do not draw this very simple yet incredibly important distinction between "weight" and fat. It is shameful and irresponsible. Sincerely, Rand McClain, D.O.
Conflict of Interest: