"Wine is not a meal."

Translation: Wino nie jest posiłkiem.

[deactivated user]

Why posiłkiem and not posiłek

[Jellei]

Grammar. It's either "Wino nie jest posiłkiem" ('jest' + Instrumental) or "Wino to nie posiłek" ('to' + Nominative).

[Sinfieldd]

But it can't be "wino nie to posiłek"?

[Jellei]

It can't. When you use the "to" construction, you can treat it as if the was an invisible "jest": "Wino to (jest) posiłek". In fact, using "jest" is also correct, just a lot less common. So then you can see more easily that as you need to negate 'being a meal', it has to be "Wino to nie (jest) posiłek".

[juanalcat]

Can it be Wino nie jest obiadem?

[4d1n]

Not, "obiad" means dinner. "Posiłek" is used while you're thinking about breakfast/lunch/dinner/supper, but don't precise it.

[silmeth]

Could be wino nie jest posiłkiem, but not obiadem when translating English ‘meal’.

[victor.pacanza]

I put 'Nie wino jest posiłkiem', why is this wrong?

[Jellei]

That's like "It is not wine that is a meal".

You tried negatine "wine", you should negate "being a meal".