Family fear star could suffer heart attack while battling weight loss

At this point when Rob Kardashian is struggling to lose weightand may have also shred some pounds, his family is now worried about the way he's choosing to do it.

The 28-year-old has not only been dropping weight at an alarming pace, but he's been yo-yo dieting for years. However an insider tells RadarOnline that the constant stopping and starting of it all is taking a real toll on his health… something his mother isn't feeling comfortable with.

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The source reveals that Kris Jenner's only son is currently doing a diet based on the Master Cleanse, but it's having a terrible effect on him.

“He’s dehydrated all the time, gets palpitations and it’s putting a lot of stress on his heart while his body goes into starvation mode. He should be taking the same time to lose this weight as he did to put it on, but now that he’s seeing results, you just can’t stop him," the insider shares.

But, in recent months, it's become apparent that the reality star is feeling better about himself. He posted his first selfie in over a year back in August.

Khloé Kardashian also confirmed an improvement in her younger brother. "He's been working out a little and trying to get his groove back," she previously explained to E!