I'm really confused about this one, does it mean "Stay healthy"? But if it does mean that shouldn't it be に instead of で?


健康 is a na-adjective, and ~でいる is the correct way to say "to stay [state]". でいられる is its potential form.

to be able to stay healthy

~にいる means "to be at/in [place]" (e.g., 日本にいる = "to be in Japan"), but 健康 is not a place.

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