AceShowbiz -

Rob Kardashian is sticking to his strict diet thanks to his new girlfriend Blac Chyna, TMZ reports. According to his friends, the strict diet has helped the "Keeping Up with the Kardashians" star shed 40 lbs.

Rob reportedly cut out red meats and carbs while working out at the gym with a trainer five times a week. He also does working out with Blac. Sources say the couple made "no cheat days" vow and they are motivating each other to sticking to it. It seems the diet program is working as Rob did look healthier and skinnier in recent pictures.

Rob and Blac recently shared on Instagram bizarre videos of them giving a tour of their healthy pantry. Blac was seen questioning all the organic, healthy foods he's stocked up on lately. In one of the videos, the mom of one held some Raincoast Crisps and asked Rob, "Babe, what is this?" Kim Kardashian's younger brother replied, "What the f**k is this?" The couple both laughed before moving on to the next item, Sharon's Sorbet. "Nah," Blac said, "Are we supposed to eat this?"

Rob looked healthy when supporting Blac during a photo shoot in Los Angeles earlier this month. At the time, he was seen hitting the beach in a casual outfit consisting of a black oversized t-shirt and workout shorts complete with a baseball cap. He couldn't keep his eyes off his sexy girlfriend as he cheered on her during the warm sunny day.