It depends on what you mean by shredded? If you’re talking about competition-state bodybuilders they starve and dehydrate themselves to get that look just before competition, which is certainly not healthy.
Professional athletes aren’t going to those extremes, but do live and breathe fitness for their jobs. That’s generally not dangerous because their diet and exercise forms are carefully managed and damage tends to build up in competition, where you don’t get to do things in perfect form.
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