Is there a term for people who feel better when underweight that is not connected to an eating disorder?

I feel better when I am underweight, and have put on muscle mass to get to normal weight but hate the extra weight nontheless. I want to be slender and light, and always underweight, but am highly into nutrition and vitamins and overall health. Is there a term to describe someone who is uncomfortable being anything but underweight, but is not eating disorder related?

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