Khloé Kardashian is looking extra-good lately – and there's a reason why. The reality star lost more than 40 lbs. with a dairy-free diet and a fierce commitment to the gym. "It really decompresses me," the 31-year-old author of Strong Looks Better Naked tells PEOPLE of her newfound appreciation of fitness. "I'm less combative and I have less anxiety." Read on to see what Kardashian eats in a day, and hear more from her in this week's issue of PEOPLE, on newsstands Friday.