You need calories to survive. However, people probably are wondering how many calories they should eat based on whether they want to gain weight, lose weight, or do neither.

 The frequently cited threshold is 2,000 calories for women and 2,500 calories for men per day to maintain the same body weight. 

However, this greatly oversimplifies the complexities of your body. The calories that you need depend heavily, no pun intended, on many factors, including your body size, your age, and your activity level.

Plus, all calories are not equal. Getting 2,000 calories from just eating sticks of butter or drinking soda is very different from getting the same number from a more balanced diet. Highly-processed foods may have different effects on your metabolism compared to natural foods. 

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