I lost a lot of weight due to surgery and im finding it hard to gain any, how can I start gaining weight?

Tiskins
I am 6ft and i used to weigh 124lbs and due to a major surgery i lost 20lbs and its really hard for me to gain any weight any tips haha i also plan to start working out so what can i eat that is healthy that will help me with exercise also? haha
I lost a lot of weight due to surgery and im finding it hard to gain any, how can I start gaining weight?
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