Why is my body rejecting weight loss?

Your body isn't rejecting weight loss, but it has natural mechanisms to maintain weight. Possible reasons for difficulty losing include not being in a true calorie deficit (underestimating food intake), metabolic adaptation where your body burns fewer calories, hormonal imbalances, insufficient sleep, high stress levels, medical conditions like thyroid issues or PCOS, certain medications, or you may have hit a plateau. Consult a doctor if you're doing everything right but seeing no results.