It doesn't matter where the calories come from, so long as you're not consuming more than your calories out. I could eat 1500 calories worth of fries and be sedentary, every day, and not gain any weight. Though I wouldn't lose it either... if that's the goal, then you need less than what your body uses to function so it burns what it's storing. You probably wouldn't feel the greatest, might poop a lot, and retain fluid, and you'd probably need a multivitamin, but you could do it. I don't encourage it as a lifestyle, obvs. But if you want fries one day, have fries, you want the pizza, have pizza. Just make smarter choices to make up for it, like a brisk walk, no soda, or a healthier dinner for the day! Everything in moderation. ?