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Rob Kardashian steps up weight loss: Kim lost 56 lbs on low-carb ketogenic diet

Rob Kardashian amps up diet and workout as part of 100-lb weight loss plan
Photo by Alexander Tamargo/Getty

Following on the heels of sister Kim's 56-pound weight loss on a low-carb ketogenic diet, Rob Kardashian has been hitting the gym hard to lose weight. His trainer, Gunnar Peterson said Rob is extremely motivated to recapture his once-buff physique, and is confident he'll hit his weight loss goals.

"With 26 years of training experience of doing this, I can tell you without hesitation that Rob Kardashian will get back to his best shape ever," Peterson told E! "There's not one doubt in my mind."

'Rob Goes the Distance During Workouts'

Gunnar, creator of Core Secrets: 25 Minute Full Body Workout, helped Khloe lose 30 pounds last year. He also trains Kim Kardashian, who lost 56 pounds in six months on a ketogenic-style low-carb Atkins diet.

Peterson said Rob is a good athlete who's really disciplined during gym workouts. "Rob is such a solid guy, when he gets in here," said Gunnar. "He works like an athlete. He never tries to beg out of a set. He never tries to hop off the cardio a minute or two before. He goes the distance every time."

Peterson commended Rob for handling the constant media fat-shaming and paparazzi scrutiny as well as he has, and said he's disappointed by the negative comments people make over Kardashian's rumored 100-pound weight gain. The 5-foot-10 Rob, who reportedly weighs more than 260 pounds, has made no secret of his struggle to lose weight.

Prediabetic Rob: 'I've Never Been So Depressed'

Rob's weight loss struggles have been a running theme on Keeping Up With the Kardashians for the past three seasons. On the March 9 episode, Kardashian was devastated when blood tests revealed he was dangerously overweight and at risk of developing diabetes and kidney failure.

“Your liver is shutting down,” Rob's mother, Kris Jenner, told him. “This is life-threatening at this point. You can only sustain this level of being unhealthy for so long.”

Rob also confessed to Khloe that his weight gain has made him extremely depressed. "I've never felt so down depressed in my life," he said. "I'm trying to be in the fashion industry and I'm not going to be taken seriously when I'm overweight. It's embarrassing to the family."

Rob had a rippling physique when he first starred on "Keeping Up With the Kardashians" in 2007. He remained in phenomenal shape until 2012, when he went through a public breakup with singer Rita Ora.

His sisters Kim, Khloe and Kourtney have all expressed concern that Rob's weight gain has made him reclusive. Kourtney recently remarked that Rob's serotonin levels were dangerously low.

Kim Lost 56 Lbs in 6 Months on Low-Carb Ketogenic Diet

Rob recently made headlines after skipping out on Kim's star-studded wedding at the last minute. Multiple sources said Rob was embarrassed by his weight and did not want to be photographed alongside all the slim, attractive wedding guests.

Meanwhile, Kim Kardashian has been looking incredible since losing 56 pounds just six months after giving birth to daughter North. Kim, 33, followed a ketogenic-style low-carb Atkins diet that limited her daily carb intake to less than 60 grams.

The ketogenic diet is a high-fat, low-carb, moderate-protein diet that has been shown to produce rapid weight loss without hunger and fight disease. Kim's daily menu combined proteins like fish, chicken and meat; healthy fats like olive oil, avocados and nuts; low-starch vegetables, and some low-glycemic fruits like berries.

Focusing on healthy fats and limiting carbs promotes weight loss by inducing the body to burn body fat for fuel, said Maria Emmerich, author of Keto Adapted.

Kardashian also exercises almost every single day, combining rigorous cardio workouts with strength-training and lots of squats. She is proud of the hard work she has put in, and slammed rumors that she got weight-loss or other plastic surgery to slim down.