You were most likely underestimating your calorie intake at first, it is a common issue. See: https://www.ncbi.nlm.nih.gov/pubmed/1454084 https://www.ncbi.nlm.

You were most likely underestimating your calorie intake at first, it is a common issue. See: https://www.ncbi.nlm.nih.gov/pubmed/1454084 https://www.ncbi.nlm.nih.gov/pubmed/1454084 Discrepancy between self-reported and actual caloric intake and exercise in obese subjects. Also, switching to a diet higher in protein tends to make people eat less calories and consequently lose fat. https://www.ncbi.nlm.nih.gov/pubmed/16002798 https://www.ncbi.nlm.nih.gov/pubmed/16002798 An increase in dietary protein from 15% to 30% of energy at a constant carbohydrate intake produces a sustained decrease in ad libitum caloric intake that may be mediated by increased central nervous system leptin sensitivity and results in significant weight loss. This anorexic effect of protein may contribute to the weight loss produced by low-carbohydrate diets. So in reality, the reasonable explanation is that you decreased your calories involuntary by upping your protein intake.