Home › Blog › AI Investigation #80: Why Fat Loss Must Be Science-Based - Energy Balance and Metabolism Explained AI Investigation #80: Why Fat Loss Must Be Science-Based - Energy Balance and Metabolism Explained 📚 AI Research 9/17/2025 Artificial IntelligenceCareer And GrowthProgrammer LifeCareer GrowthIndie Dev Zikang Wu · 1 min read AI Engineering & Backend Platform Developer 📖 This article is from CSDN original. Click to read the original for a better reading experience. Energy Deficit Every 7,700 kcal reduction = 1 kg of fat Daily deficit 300-500 kcal Energy Expenditure Basal metabolism: 60-75% Activity expenditure: 15-30% Thermic effect of food: 5-10% Influencing Factors Muscle mass Age Hormone levels