Tue. Dec 1st, 2020

  Have you ever wondered why some days all you want to do is snack?


  Under normal circumstances, we feel hungry when we have burnt up the food we have eaten as energy and our blood sugar and insulin levels begin to drop. Ghrelin, a hormone connected to appetite, then communicates this to the brain, which is how we feel the need to eat.



  Ghrelin:/ ɡr l n/食欲刺激素

  But all sorts of things can interfere with this process.


  1 When you are tired

  According to a 2011 study by researchers at Columbia University in the US, those who are sleep-deprived eat almost 300 calories a day more than those who get enough sleep.


  This is because levels of the hormone ghrelin, which tells the brain we need to eat, increase when we don't get enough sleep.


  The Columbia researchers noted that the women who didn't get enough sleep took in more fat rising by around 30g on sleep-deprived days — four times as much as the average increase for men.


  2 Troubled times

  In a 2013 study, people who were primed to expect "tough times ahead" ate more food than people who listened to neutral messages.



  It's thought that hearing about troubled times causes a survival instinct to kick in, leading to cravings for high-calorie snacks such as chocolate.


  3 'Naughty' food cravings

  Tempted by that extra biscuit? Then just enjoy it — as researchers have found that when you feel guilty about a pleasurable experience, the guilt itself becomes pleasurable, so encouraging you to do it more.


  "If we consider something a naughty pleasure, it can psychologically drive the appetite and the guilt may make you want to eat more," says Cary Cooper, at the University of Lancaster.

  兰卡斯特大学的Cary Cooper说,如果我们认为某件事会带来不守规矩的快感,它会在心理上促进食欲,而这种内疚可能会让你想要吃更多。

  The appetite center of the brain also lies very close to the area governing mood — the limbic system — which is why changes in the way we feel may affect appetite.



  4 Mobiles' blue light

  The bright blue light emitted by devices such as smartphones and tablets may give an unwelcome boost to your appetite.


  Research this year found that your appetite continued to increase when you are exposed to the light.


  It also altered people's metabolism, as blood tests showed that the blue-light subjects had higher insulin and glucose levels.


  metabolism /m 't b l z m/:新陈代谢

  glucose /'ɡlukos/:葡萄糖

  One possible explanation is that bright blue light at night confuses our body clock, which has a role in controlling when we feel the need to eat.






文章标题: 为什么你明明不饿,却总想吃东西?科学解释来了!

By admin