iirc, it says it's not for people who have a bunch to lose, but only like 20ish pounds. I guess the "magic" is what kinds of foods to eat to help you keep lean mass whilst losing fat on such a deficit. There's been studies proving that low cal plans can maintain lean tissue based on what you eat and weight training as your workouts. So... it's doable and it's different from a starve yourself and eat shit while running marathons kind of fast weightloss.
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