医師の一分

アクセスカウンタ

zoom RSS 肥満の人は嗅覚も敏感

<<   作成日時 : 2010/11/16 20:06   >>

なるほど(納得、参考になった、ヘー) ブログ気持玉 1 / トラックバック 0 / コメント 0

 太りすぎの人は食物にたいしてより敏感な嗅覚を持っているという。スリムでいるには相当な努力が必要なのかもしれない。
 ニオイの情報を処理する脳の部分が、食事中枢ともつながっていることは既にわかっている。
 英国では成人の1/4が肥満であり、増加する一方である。研究者らは肥満の流行の原因を探っている。
 ゆがんだ嗅覚がその責任の一部かもしれないとしてロレンツォ・スタフォード博士らは研究を進めた。64人のボランティアに研究参加を依頼した。空腹の時よりも食後に食物のニオイに敏感になっている。鋭敏な嗅覚が満腹でも食事を続けるようにし向けているようだ。

-------------------------------------------------------
15 November 2010 Last updated at 12:53 GMT
Obesity's link to sense of smell
http://www.bbc.co.uk/news/health-11755995

画像People who are overweight have a greater sense of smell for food, a study has found.

Researchers from the University of Portsmouth say their early findings may go towards explaining why some people struggle to stay slim.

Experts already know that part of the brain that processes information about odour is also connected to the feeding centres of the brain.

The latest research is published in the journal Chemical Senses.

In the UK, a quarter of adults are obese and doctors fear that the incidence will only rise in the future as more and more people continue to pile on excess weight.

While too much food and too little exercise may be largely to blame, scientists have been searching for the underlying causes driving the obesity epidemic.
Continue reading the main story

To this end, Dr Lorenzo Stafford and his team set out to study if a skewed sense of smell could be partly to blame.

Heightened sense

His team asked 64 volunteers to take part in a series of experiments that tested their smelling ability.

Their study found that people appear to be slightly better at smelling food odours after they have eaten rather than when they are hungry.

Scientists do not yet know why this is, but Dr Stafford suspects that it could be the body's way of detecting and rejecting foods no longer needed in order to maintain the right energy balance and stop a person eating too much.

His team found that people who are overweight - those with a higher body mass index or BMI - have a far heightened sense of smell for food compared to slim people, particularly after they have eaten a full meal.

Dr Stafford believes this keener sense of smell might compel the individual to carry on eating, even when they are full.

He said: "It could be speculated that for those with a propensity to gain weight, their higher sense of smell for food related odours might actually play a more active role in food intake.

"Hopefully this research will stimulate more work in this area with the potential to help those who struggle with their weight and those who treat people with weight problems."

-----------------------------------------------------
Chem. Senses (2010) doi: 10.1093/chemse/bjq114 First published online: October 26, 2010

High Hunger State Increases Olfactory Sensitivity to Neutral but Not Food Odors

1. Lorenzo D. Stafford and
2. Kimberley Welbeck

+ Author Affiliations

1.
Department of Psychology, University of Portsmouth, King Henry Building, King Henry I Street, Portsmouth PO1 2DY, UK

1. Correspondence to be sent to: Lorenzo D. Stafford, Department of Psychology, University of Portsmouth, King Henry Building, King Henry I Street, Portsmouth PO1 2DY, UK. e-mail: lorenzo.stafford@port.ac.uk

* Accepted September 27, 2010.


Abstract

Understanding how hunger state relates to olfactory sensitivity has become more urgent due to their possible role in obesity. In 2 studies (within-subjects: n = 24, between-subjects: n = 40), participants were provided with lunch before (satiated state) or after (nonsatiated state) testing and completed a standardized olfactory threshold test to a neutral odor (Experiments 1 and 2) and discrimination test to a food odor (Experiment 2). Experiment 1 revealed that olfactory sensitivity was greater in the nonsatiated versus satiated state, with additionally increased sensitivity for the low body mass index (BMI) compared with high BMI group. Experiment 2 replicated this effect for neutral odors, but in the case of food odors, those in a satiated state had greater acuity. Additionally, whereas the high BMI group had higher acuity to food odors in the satiated versus nonsatiated state, no such differences were found for the low BMI group. The research here is the first to demonstrate how olfactory acuity changes as a function of hunger state and relatedness of odor to food and that BMI can predict differences in olfactory sensitivity.


テーマ

関連テーマ 一覧


月別リンク

ブログ気持玉

クリックして気持ちを伝えよう!
ログインしてクリックすれば、自分のブログへのリンクが付きます。
→ログインへ
気持玉数 : 1
なるほど(納得、参考になった、ヘー)

トラックバック(0件)

タイトル (本文) ブログ名/日時

トラックバック用URL help


自分のブログにトラックバック記事作成(会員用) help

タイトル
本 文

コメント(0件)

内 容 ニックネーム/日時

コメントする help

ニックネーム
本 文
肥満の人は嗅覚も敏感 医師の一分/BIGLOBEウェブリブログ
文字サイズ:       閉じる