I can't speak for anyone but myself, but here's my reasoning. I have a very hard time losing weight while eating a diet high in carbs- even really good carbs like brown rice, quinoa, etc. I can maintain weight loss on a high carb diet- and I eat primarily vegan when I'm maintaining- but I have found I really have difficulty losing weight unless I cut all grains, fruit, and starchy foods like potatoes out of my diet (I do not cut out leafy greens, zuchini, onions, mushrooms, peppers, broccoli, cauliflower, brussel sprouts, etc- those are allowed as much as I want). I can usually lose 3 lbs a week when following a diet like this. It's very difficult for me to maintain that strict a diet, however, and so I've been doing it twice a year for a month at a time. I'm actually just now going into a one month low carb cycle with a goal of losing 15 lbs. At that point, I will likely go back into maintenance mode for a while and do another cycle this fall. There is an actual definition for my metabolic type which my doctor explained to me and I have since forgotten but essentially it's a recognized metabolic issue for some people to have difficulty losing weight unless they cut carbs.
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