Is gaining healthy weight easy for you without just adding belly fat?

I find it too difficult, I get too much belly fat and nothing in my arms or legs. With healthy food.
But losing weight is too easy but losing that belly fat is not so easy.
So I gain all of it on my belly but when I am losing weight it cuts from my muscles more than the fat built up.
I know that is normal in some body's.
How does it work for you people
Is gaining healthy weight easy for you without just adding belly fat?
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