Kim Kardashian, Mariah Carey, Blac Chyna and Khloe Kardashian have dispensed weight loss tips which they claim help them get skinny. But doctors reject their advice because they don't practice what they preach and their logic is flawed. Each of their trimmer figures are as much plastic surgery as diet and exercise. Their eating plans don't lead to healthy, sustainable weight loss. For that, obesity experts recommend a 90-10 ketogenic diet and counting calories using an 11-calorie-per-pound rule.

Kardashian pregnancy weight loss myths

You'd have to, like Alice in Wonderland, believe six impossible things before breakfast if you wanted to make the "Keeping up with the Kardashians" diet work. Both Kim Kardashian and Blac Chyna (ironically a fitness/weight loss guru) had a 70-80 pound weight gain in pregnancy. Both assumed they'd magically drop it and get the pre-baby body back quickly. When that didn't happen, they panicked. Doctors advise that pregnant women gain no more than 30 pounds in pregnancy and less if mom is already overweight or obese.

Kim, Khloe Kardashian serve mixed messages

The "KUWTK" sisters are always at the gym but rarely exercising, always talking diet while eating and drinking. Experts say to get pounds off you have to follow a 90-10 diet which means strictly following it 90-percent of the time. Kim Kardashian says she eats 1,800 calories a day which is far too much to maintain her boasted 124 pounds. 1,380 calories a day (goal weight times 11) is more like it.

Yet somehow these paragons flaunt impressive weight loss. Or do they? After nagging Rob Kardashian to lose, Blac Chyna found it wasn't so easy. At least when the baby mama failed to lose much pregnancy weight, she just got comfortable with obesity.

Mariah Carey dishes up strange fad diet

Mariah Carey offered her tip to looking skinnier (besides photoshopped pictures, breast implant surgery and tummy tuck).

Eat nothing but capers and smoked salmon. Dr Nowzaradan of "My 600-lb Life" would find 600 reasons to reject this crash diet. First, it's too restrictive and impossible to maintain. His pre-surgery diet includes fresh vegetables, whole grains, high protein dairy and meat. Patients must stay away from salty processed foods on which the "Mariah's World" diet relies. Even after gastric bypass, the bariatric surgeon advises a high protein ketogenic type diet.

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