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Ariana Grande wants to put an end to the chatter about her appearance for good ... sending a subtle reminder to gossipers that it's "dangerous" to speak about someone's body in all forms.

Check out her post -- the "Wicked" star shared her message on Instagram Saturday by reposting an interview from her promo days for the first film last year. During the interview, she says she's no stranger to comments about her physique, but says she thinks it's harmful for all involved.

She explains ... "In today's society, there is a comfortability that we shouldn't have at all -- commenting on others' looks, appearance, what they think is going on behind the scenes, or health or how they present themselves ... that I think is really dangerous."

She goes o

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