I think you can just tell the guy . .. "Yo dude you are picking up some weight." Guys are easy.
With a girl. I can't see any polite way to tell her. Or any way to tell her that won't cause other long term problems.
So my advice with a girl would be to just not tell her and if you find her less attractive . . break up with her and give no reason.
I don't believe in changing people.
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