9 months ago
Last edited at 3:11AM on 3/28/2013
I've never heard that, who has said that? I think it's because it would mean you didn't enjoy the food, and found the meal boring, so it's an insult to the chef. It's like Italian people clearing their plates to show they appreciated the meal, and Japanese people making slurping noises while eating to show they are enjoying the meal. What culture is this you are talking about? Added note: look at NorahKee88's answer, she seems to know what she's talking about more than I do.
Most of the elders believed that if you yawn after eating you may have a reflux or may cause a headache. Different cultures have different superstitions, so this may be one of them. However, according to the scientific research, there is no problem with yawning after or before food as it helps balance the air in the ear track.
9 months ago
Last edited at 3:18AM on 3/28/2013
Never heard that one either. In fact, it's very common that a person may feel tired and sleepy after a big meal. There is tons of research about it.
Turkey, for instance contains L-tryptophan, an essential amino acid with a documented sleep inducing effect. L-tryptophan is used in the body to produce the B-vitamin, niacin. Tryptophan also can be metabolized into serotonin and melatonin, neurotransmitters that exert a calming effect and regulates sleep.