No single diet plan will work for everyone. Commonly, the first thing wrongly do is cut out carbohydrates from their diet, they stop eating bread, potatoes, pasta etc. Thinking that it was all the carbohydrates that they consumed did cause the weight gain. But in reality, weight loss/weight gain is all about ENERGY BALANCE
Energy in < Energy out = weight loss.
Energy in > Energy out = weight gain.
Energy in = Energy out = no change in weight.