點解中國人成日打招呼時都問人食o左飯未?

有種種原因嘅
１．可能係上一代流傳落嚟
２．ｄ人唸唔到其他可以代替
３．呢個問題係好易回答　只有３個答覆（食左／食緊／未食）
４．唔使人地點唸點答
５．中國文化係咁掛
６．出於關心
不過點都好喇，都係一句姐！！

點解西人見人叫哈佬好嗎..仲會吻下臉？？？？？
表示習俗.禮貌.各處鄉村各處例？？？

My friend said I always ask this question on the phone. So I agree with the previous answer that dunno what to say to start a conservation, so ask other people eat yet is safe and no need to think much for other people to answer.

这是中国的文化，没有得问为什么。。可能是因为中国人以食为本或民以食为天等等有关吧。

是慣性問候, =english 問'How are you?'