Rob Kardashian Weight Loss: Lifestyle Comes Under Scrutiny in Weight Loss Struggle (VIDEO)

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(Photo: Reuters/Steve Marcus)Television personality Rob Kardashian arrives at the opening of the Kardashian Khaos store at the Mirage Hotel and Casino in Las Vegas, Nevada in this December 15, 2011 file photo.

Rob Kardashian's weight loss has become the target of speculation this week, as celebrity news sites and social media commenters have weighed on his struggle to lose weight.

Celebrity news website, TMZ, produced a video highlighting how Rob has spent the last few months running, hiking and trying to lose weight. However, after all his efforts they suggest he has not managed to lose anything.

TMZ staff can be heard urging that the problem must come from his lifestyle and wider changes are needed. Others said that "booze and food" are the culprits and that Rob would need to change things more to supplement his exercise efforts.

Rob's weight loss has been in the media a lot over recent months. Previously he had an altercation with a female photographer who took pictures of him after he came out from a Los Angeles gym.

However, Rob is not the only member of his family to come under the microscope for his weight, and sister Kim Kardashian, who is pregnant, has also had her weight highlighted continually over the past few months.

Pregnant Kim is just two months away from giving birth to her first child with partner Kanye West, however, that has not stopped celebrity mags highlighting her weight gain.

Even just this week photos emerged of Kim's feet, showing that they were severely swollen. The photos even led some to suggest the reality TV star was suffering from edema, which is a clinical term for swelling.

Edema during pregnancy is common, and occurs mostly in the feet and ankle area.

Kim meanwhile has spoken of the differences between her and West, telling Fabulous magazine: "We live different lives, but I love being open. That's who I've always been. That will never change because that is who I am. It does worry me when I think about it."

She continued: "I'm definitely more of a recluse since I'm pregnant but I haven't necessarily decided to hold myself back, it's just preparing myself for respecting the privacy of my child and my boyfriend."