Weight gain refers to an increase in body weight. It can occur due to an increase in body fat, muscle mass, or water retention, and can be caused by a variety of factors including: 1. **Caloric Surplus**: Consuming more calories than the body burns can lead to weight gain, as the excess energy is stored as fat. 2. **Diet**: A diet high in processed foods, sugars, and fats can contribute to weight gain.
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