Why is fasting considered healthy while sub-1000 calorie diets are considered dangerous?

I know there's a lot of debate around whether or not fasting is actually good for you, but there's a pretty massive community who support it and can show evidence of its benefits. But there's absolutely nothing of the sort for VLCD. Every time someone mentions that they're eating, say, 500 calories a day, the reactions are pretty intensely negative. Why is it worse for you to eat a small amount of calories per day than it is to eat no calories at all? I'd have thought you'd at least be getting some vitamins and energy out of the VLCD, and you could probably fit a fair amount of high volume food in there. Not condoning either diet as I've never done them, just curious about why one is so supported while the other is hated.

submitted by /u/nythwn
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