It is a well-known fact that Beyonce had a very short amount of time to lose the 57 pounds she gained while she was pregnant. The singer revealed to Self magazine that she made the mistake of booking a performance for just three months after she gave birth to her daughter Blue Ivy. 

"I ate a very low-calorie diet. I stayed away from red meat and ate a lot of fish, replaced pasta and rice in quinoa," Beyonce told Self. "I always have breakfast, say, scrambled egg whites, a vegetable smoothie, or whole-grain cereal with low-fat milk. For lunch and dinner, I eat a lot of fish and vegetables. And throughout the day, I try to stay hydrated." 

She also gave herself one cheat day a week, allowing herself to indulge on Sundays. 

"I always treat myself to one meal on Sundays when I can have whatever I want. Usually it's pizza, which is my favorite indulgence."