I felt like I have lost a few pounds... how do I get them back fast?

Even though I have gained 15 pounds recently I'm still a stick but I felt like I have lost five pounds. I need to get them back fast and gain extra ten pounds. I'm starting to look like my old self and I don't want that anymore... is there any food anyone can recommend to me?
I felt like I have lost a few pounds... how do I get them back fast?
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