How to eat less and have better portion control

You can eat a Big Mac in 3 minutes, and then you have to go running for an hour to burn it. If we take a step further, 7,700 calories are roughly 1 kg of fat together with water (or 3,500 kcal equals 1 lb of fat). So if you eat 500 calories over your TDEE (Total Daily Energy Expenditure), you will gain 1 kg of fat in two weeks.