On Sunday's episode of "Kourtney & Kim Take Miami," we learned that Rob Kardashian has put on 40 pounds since his split from Rita Ora.
"All I did was waste a lot of money and gain 40 pounds," Rob, 25, told his sisters of the tumultuous relationship. "I need to focus on me. That’s all I wanna be about."
And now it looks as if Rob is determined to follow through with his weight-loss goal.
"Goodness I can cook! Swordfish, kale salad, asparagus," he tweeted Thursday, with an Instagram photo of his healthy dinner.
"Another fat boy breakfast. Let's go! 5 mile run next. 50 pounds gots to go!" he shared in another tweet, along with a picture of eggs and grapefruit.
Fortunately, he already has one strong supporter in his older sister Khloe, who replied, "I believe in YOU."
— KhloéKardashianOdom (@KhloeKardashian) February 21, 2013
Khloe, 28, recently opened up about her own weight, proclaiming that she's confident about her curvy figure.
"A few years ago I lost 30 pounds, and people still wanted to criticize. And honestly, I’m happy with myself if I’m a little heavier," Khloe told Glamour magazine. "I realized: 'Why am I trying to conform to someone else’s idea of beauty?' I think I’m beautiful either way."