Gut-wrenching simulation video reveals impact of fasting on the body

It's a diet trend endorsed by everyone from Hollywood A-listers to .

But, to the dread of dietitians across the planet, there's an even more extreme version of 'intermittent fasting' being taken up by those wanting to lose weight—the OMAD diet.

An abbreviation for 'one meal a day', the trend does exactly what it says on the tin.

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