Tesla CEO Elon Musk tweeted over the weekend that he has lost 20 pounds and feels much healthier after he was trolled concerning his weight when photos surfaced of him relaxing on a yacht near Mykonos.

Musk, 50, has been using intermittent fasting to drop weight, according to the New York Post. He admitted Sunday on social media that he was “over 20 lbs down from my (unhealthy) peak weight.”

“On advice of a good friend, I’ve been fasting periodically & feel healthier,” Musk stated on Twitter.

Musk spoke about using the “Zero” fitness app. He called it “quite good.” The app claims to be a resource for users to “unlock the power of intermittent fasting to lose weight and improve your metabolic health.”