The weight loss depends upon the number of factors.  Current weight, Age, metabolism, associated diseases- like thyroid issues, PCOD, etc to name a few. It also depends upon the number of weight-loss trials that one has made, before joining the diet program. So, if someone is trying to lose weight for the first time and is under the obese category ( as per the BMI standards) and also doesn’t suffer from any associated medical issue – he/ she can expect to lose at least 4 kilos in the first month.