Is it haram to complain about food?

No, it isn't haram to dislike a food, but criticizing food is against the sunnah. The Prophet ﷺ never insulted any food: if he liked it he ate it, and if not, he simply left it. Honest feedback given kindly is fine; mocking or grumbling about a meal is poor manners.
The Prophet's ﷺ example
Abu Hurayrah said the Prophet ﷺ never found fault with any food. If he liked it, he ate it, and if he disliked it, he left it (Sahih al-Bukhari 5409). He didn't pull faces, make comments, or spoil the meal for others.
He even had personal dislikes. When a roasted lizard (dabb) was served, he didn't eat it and explained that it wasn't eaten in his people's land, so he found himself not wanting it. Yet he didn't forbid it, and Khalid ibn al-Walid ate it in front of him (Sahih al-Bukhari 5391). So having taste preferences is completely normal.
He also found good words for simple food. Once, when only vinegar was at home, he ate it with bread and said, "What an excellent condiment vinegar is" (Sahih Muslim 2052).
Why criticizing food is discouraged
- Gratitude. Every meal is a gift from Allah. Many people in the world have nothing.
- Kindness. Someone spent time and money cooking it. Harsh comments hurt them.
- Contentment. Constant grumbling builds an ungrateful heart over time.
What's allowed
Not every comment counts as complaining. These are fine:
- Saying "I'm not a fan of mushrooms" without insulting the dish.
- Kindly telling your spouse "a bit less salt next time" in private.
- Sending back a wrong or undercooked order at a restaurant politely.
- Writing an honest, fair review of a restaurant.
Just watch the line: sharing a real problem is not the same as being ungrateful. See Is it complaining against Allah to share my struggles?
When family cooks for you
For converts, this often comes up at a parent's dinner table. If you can't eat something for halal reasons, explain gently and thank them for the effort, rather than criticizing what they made. See Can I eat food my non-Muslim mom cooked? Ending the meal with thanks to Allah and to the cook goes a long way. See What does "Alhamdulillah" mean and when do I say it?
- Disliking a food is not a sin; the Prophet ﷺ had dislikes too.
- He never criticized food: he ate it or quietly left it (Sahih al-Bukhari 5409).
- Polite, honest feedback and fair reviews are fine.
- Thank Allah and the cook; gratitude brings more blessing.
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