Chrissy Teigen poses naked and talks Kim Kardashian's email response time

Chrissy Teigen loves to keep it real, giving fans glimpses into her life with husband John Legend, behind-the-scenes shots from shoots, escapades in the kitchen and even stretch marks, but she bares more than her soul on the cover of Women's Health UK, stripping nude for the cover of the "Naked Issue." The Sports Illustrated model also opens up about her struggles with weight and her relationship with Kim Kardashian.

This past year, the 29-year-old made one of her longtime dreams come true, taking her love of food professional and penning a cookbook, but she reveals that it didn't help much where the scale was concerned. “Working on the cookbook, I put on around 11 lb in five weeks, despite doing regular workouts," she told the magazine.

CLICK PHOTO TO ENLARGE: Chrissy has made her love of food known and is releasing a cookbook. Photo: Instagram

She added: "Before, I was always thin and just had to tone up, but now I’m trying to keep that extra layer [of fat] off. I’m having a tough time getting back to my pre-cookbook weight. It’s only 5lb, but it’s frustrating… My tummy has always been my problem. I’ve never seen an ab, no matter how many crunches I do.”

Read More: Supermodel Chrissy Teigen reveals her stretch marks

The model's prowess in the kitchen - and love of delicious food - is well documented as she keenly shares photos with fans on Instagram, from hot and stretchy garlic bread to pasta in bed after a red carpet. While not the typical diet of a model, Chrissy says she has to work out extra hard to maintain her physique.

The model is baring all for the cover of Women's Health UK. Photo: Instagram

"I used to take pride in the fact I didn’t have to work out, and then I hit that age where you have to," she noted. " I want to drink champagne and have hearty dinners, so I would rather work out for an hour and be able to do what I want . I’ve always had to watch myself. My family is not naturally thin and we put on weight quickly. I find low-carb works for me.”

Read More: Workout secrets from Beyoncé, Chrissy Teigen and more

Aside from her love of food, Chrissy also opened up about her friendship with Kim Kardashian. “Kim is lovely," she noted. " I’ll email her and she gets right back to me. It makes me feel like garbage because I’m like, ‘I’m 10% as busy as you and I don’t get back to people.’ They are the most beautiful family. I look at them and think, ‘How do I get this?’”

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