Former Florida Gov. Jeb Bush says he's lost 40 pounds in the past six months as he runs for the GOP presidential nomination.

Bush, 62, said in a Sunday interview at a Dairy Queen with CBS affiliate KCCI in Iowa Falls that he shed the weight through exercise and a paleo-style diet of meats and vegetables.

The former governor said in February that he was on the trendy diet, which avoids refined sugar, dairy, grains and processed foods.

"I am always hungry," Bush lamented in late April, according to The New York Timeswhich reported at the time that he had lost around 30 pounds since December.

Bush, who officially launched his White House bid in mid-June, currently polls second in the extremely crowded GOP field, behind businessman Donald TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for ‘serious case of amnesia’ after testimony Skier Lindsey Vonn: I don’t want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE, based on a Monmouth University survey out Monday.