Emma,
First, you have to know the reason why you gained weight.
Is it because you are depressed and eat excessively?
Is it because you are tired constantly and opt to eat junk food?
Is it because you stopped doing exercises but continue eating the same amount of food that you usually burn when exercising?
When you know the real reason behind your weight gain, you will be able to know the steps needed to getting your old weight back.
Bottom line, you have to get enough rest, maintain a positive attitude, do exercises or sports, and be aware of your food intake. Everything should be in moderation.
I hope this helped! Good luck!
