How long can it take to lose 30kg?

Answer 1

It takes approximately 3500 calories to equal one pound of fat. Multiplying that by 2.2 gives you 7700 calories to a kilogram. The average adult male ingests 2000-2500 calories while the average adult female ingests 1500-2000 calories. If you were to do it healthily, you'd reduce intake by 500 calories per day, or 3500 per week. That would be about half a kilogram (one pound). So in total it would take 60 weeks or just over a year. However, there are many other factors to take into consideration such as introduction of exercise to increase calorie lost and metabolic rates.