1 kg of fat is about 7700 calories. So if you are in deficit by 1100 calories per day, then you should lose about 1 kg of fat. Assuming that you have a base m

1 kg of fat is about 7700 calories. So if you are in deficit by 1100 calories per day, then you should lose about 1 kg of fat. Assuming that you have a base metabolism of 2000 calories per day (average for a male of average size), and say you did an hour of moderate aerobic exercise (like jogging) every day (600 calories per day), the with a diet of 1500 calories, you should find yourself losing about 1kg a week on average. If you are not losing any weight with the above, then the potential explanations are: - You are in ultra efficiency mode: In other words, you are burning only 900 calories a day. - You are not running an hour a day. - You are not eating 1500 calories a day. Let's say you are 70 kg. It takes 1 calorie of energy to raise 1 kg of water by 1 degree. You are roughly 15 degrees above ambient temperature. Thus it takes 1050 calories to raise your temperature from ambient to body temperature. It is highly unlikely that your body will be able to maintain body temperature for an entire day on 900 calories. Thus, the only other explanation are the other two.