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August 11, 2007


Hormone Found to Govern Desire for Food


Leptin, a hormone that helps to control feelings of hunger, also appears to govern the desire to eat, British researchers report.


The finding could lead to new insights into obesity and how to treat the condition, the researchers said.


"This work shows that the rewarding properties of food have strong effects on brain areas concerned with liking and desire, and that the tendency for some people to overeat because they like food is influenced by specific hormones and chemicals in the brain," said lead researcher Paul C. Fletcher, a member of the Department of Psychiatry, University of Cambridge, Addenbrooke's Hospital.

「本研究は、食物の報酬特性が好みおよび欲求に関係する脳部位に強い影響を及ぼして、脳内の特異ホルモンおよび化学物資によって、食べ物が好きであるために一部の人々が過食になる傾向がありますと、アデンブルック病院、ケンブリッジ大学の精神科部員、主要研究者、Paul C. Fletcher,は述べた。

psychiatry :精神医学、精神科

Leptin is produced by fat cells and circulates in the bloodstream to reach the brain, where it acts to reduce hunger and increase the feeling of fullness, according to the report in the Aug. 9 issue of Science.


In the study, Fletcher's team studied two people with a rare genetic disorder and don't produce any leptin. They eat excessive amounts of food --even foods they don't especially like -- and are obese. However, when they were treated with leptin, they ate less and lost weight.


The researchers showed the two patients pictures of various foods while they recorded their brain activity. The scientists found that the pictures stimulated activity in the area of the brain called the striatal regions. These regions are associated with pleasant emotions and desires.


striatal regions 線条体の領域

One region in particular, the nucleus accumbens, was highly responsive to pictures of foods that the patients liked, the researchers found.


But when the patients were treated with leptin, the pictures of foods produced a reduced response in the brain. And the response was activated mostly by foods the patients liked and only when they hadn't eaten and were hungry, the researchers said.


"Understanding how brain systems interact with hormones that signal hunger and energy stores
will provide us with a more complete picture of factors controlling eating behavior and will hopefully take us beyond some of the prevailing and simplistic assumptions about why some people have difficulties in controlling how much they eat," Fletcher said.


"Such understanding will be a key step in the prevention and treatment of obesity. Importantly, the finding that the liking of food is biologically driven should encourage a more sympathetic attitude to people with weight problems," he added.


One nutrition expert doesn't think enough is known about how leptin works to change the way obese patients are currently treated to control their appetite.


"Such an extremely small study can't provide conclusive evidence, but it adds to the growing body of research in the area of leptin and appetite," said Connie Diekman, director of university nutrition at Washington University in St. Louis and president of the American Dietetic Association.

「そのような極めて小さい研究が決定的な証拠を提供することができないがレプチンおよび食欲の分野における研究機関の増大に追加することになるとセントルイスのワシントン大学の大学栄養学部の責任者およびアメリカ ダイエット協会の理事長、Connie Diekmanが述べた。

Studies continue to support the role of leptin in appetite regulation, but they have yet to determine the exact mechanism and how to modify the process, Diekman said. "Until more research is provided, the impact of research in the area of leptin doesn't change how patients are managed when it comes to appetite control," she added.


Another expert thinks the British study could lead to new obesity treatments.


"The reason we study leptin is because of the levels of obesity in society," said Michael A. Cowley, an assistant scientist in the Division of Neuroscience at Oregon Health and Science University. "This study is important, because it explains how and why people crave food."
「レプチンを研究する理由は社会における肥満度のためである」と、オレゴン健康科学大学神経科学部、科学助教授、Michael A. Cowleyは述べた。「この研究は如何にしておよび何故人は食物を切望するかを説明しているため重要であります。」

Cowley thinks this knowledge will lead to new therapies for obesity. "We become obese, because we really like hamburgers or can't stop eating doughnuts. We become obese, because we obsess about food," he said.


This study shows that leptin can help control that obsession, so it can become a new therapeutic target, Cowley said. "This study shows that craving is modifiable by leptin," he said.



空腹ホルモン レプチンと記憶の関係




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