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Kate Upton's bikini body secret is a low-carb gluten-free diet

Kate Upton's trainer reveals her bikini-body secrets: Low-carb, sugar free diet
Kate Upton's trainer reveals her bikini-body secrets: Low-carb, sugar free diet
Walker, Kempin/Getty Images

Supermodel Kate Upton has a hot bikini body, thanks to a low-carb, gluten-free diet that's low in sugar, said her trainer David Kirsch. Kirsch, who also trains Heidi Klum, said Upton is very disciplined about her diet and workout regimen.

"Everyone wants to know if Kate is disciplined with her diet and exercise, and the answer is that she is amazing about her diet," Kirsch told Elle. "She does a few egg whites with spinach for breakfast, and when she wants to, she does a 48-hour cleanse."

Low-Carb Diet and Circuit Training Are Kate's Secrets

David is a proponent of a gluten-free diet, saying eliminating gluten not only enhances weight loss, but improves mood. "It's sugar, alcohol, and processed carbs that we avoid," said Kirsch, author of the book, The Ultimate New York Body Plan.

"I don't have Kate on a specifically gluten-free diet, but by the nature of what she eats, it is gluten free. I have both my daughters on gluten-free diets and you can see the difference."

Kirsch, who whipped Upton into shape for her two Sports Illustrated swimsuit cover shoots, said intense circuit-training workouts are the foundation of their exercise sessions.

We do extreme, intense circuit training. We do three or four circuits and change them up a lot. There's lots of core, butt and thigh-shaping and toning. We work with resistance bands, stability balls, do lateral lunges for the inner thighs and for arms we do boxing. It's a very efficient way to work out and get your cardio in."

Kirsch said everyone can benefit from fat-blasting circuit-training workouts in as little as 10 minutes. "Make time for one or two circuits first thing in the morning," said Kirsch, creator of The Ultimate New York Body Plan workout DVD.

"No one can tell me they don't have 10 or 15 minutes extra minutes a day. I don't believe it. You don't have to do 90 minutes.

Gorgeous Blonde Was Called a Lardy Cow With Common Looks

Despite having made the cover of the Sports Illustrated swimsuit issue two years in a row, Upton has been widely criticized for being too meaty to be a supermodel.

Kate, who has been been called a "lardy, fat pig" and a tacky-looking bimbo, is shocked that her weight is such a hot topic, but has answered the criticism by proclaiming that she embraces her body just as it is.

“It’s kind of funny to think, 'The news is talking about whether I’m fat or not," she told Vogue. “It was hard at first. You sit there and you’re like, ‘Is something wrong with me?’ I can work out and I can stay healthy, but I can’t change some things. I really just live my life. I love my body."