Tips on how to gain weight? Anorexia?

But in a healthy way.

I just got out of rehab for anorexia and I'm finding it hard to put the tips they told me into practice, I don't believe the place was right in telling me that I should like eat a slice of cake a day and all that. I want to be healthy not fat otherwise I will relapse, what's the best things to eat to maintain a healthy weight, what is a healthy weight?
Tips on how to gain weight? Anorexia?
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