When you bake cakes for a living, it has to be nearly impossible to watch what you eat. But Ace of Cakes star Duff Goldman is doing just that—and his weight loss so far makes him look nearly unrecognizable.On Tuesday, Goldman posted a side-by-side comparison on Instagram, and the weight loss is striking. "Wow. It's been three months and I feel like these are photos of two different people," he wrote. The Food Network star said he has already dropped one T-shirt size:Goldman has been frequently giving fans updates on his fitness program, even lifting weights while on vacation in Israel. According to E! News, he told fans that he's losing weight "the old school way," focusing on "eating clean, riding my bike, and lifting weights."He's also focusing on eating clean, and even cut carbs on the Fourth of July:He has also been eating pre-portioned food from the Pro Train plan:It seems like sweets are his weakness, which is no surprise. He joked about "dreaming of candy" while working out:But despite the dramatic change so far, Goldman isn't done with his diet just yet. He told a fan on Twitter that he still has a "long way to go" until he meets his goals.