Find some solutions in another topic of Solutionbay about eating disorders. It will be very helpful if you are trying to gain weight after long dieting.
If you were dieting for too long and now you want to stop, but you can't gain weight or you can't eat anyway, it might be anorexia nervosa which is a quite serious mental disorder. So you will need some help from a good psychologist. Find him or her in your area or online.
If you were dieting for a long time, you have a lot of dieting friends (online or offline). Try to communicate less with them at least for the first time, when it's hard yet for you to come back to normal diet.
If you were dieting for too long, your stomach shrank, so it's hard to eat a normal quantity of food for you. Don't torture yourself and add more food little by little every day or even every week. In some time, your stomach will get its normal size and you will have a normal appetite again and gain some weight.
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