It's official. That tub of ice-cream really can control your brain and say "eat me."

    A U.S. study by UT Southwestern Medical Center at Dallas has found that fat from certain foods such ice-cream and burgers heads to the brain.

    Once there, the fat molecules trigger the brain to send messages to the body's cells, warning them to ignore the appetite-suppressing signals from leptin and insulin, hormones involved in weight regulation -- for up to three days.

    "Normally, our body is primed to say when we've had enough, but that doesn't always happen when we're eating something good," said researcher Deborah Clegg in a statement.

    "What we've shown in this study is that someone's entire brain chemistry can change in a very short period of time. Our findings suggest that when you eat something high in fat, your brain gets "hit" with the fatty acids, and you become resistant to insulin and leptin.

    "Since you're not being told by the brain to stop eating, you overeat."

    The researchers also found that one particular type of fat -- palmitic acid which is found in beef, butter, cheese and milk, -- is particularly effective at instigating this mechanism.

    The study was performed on rats and mice but the scientists say their results, published in The Journal of Clinical Investigation, reinforced common dietary recommendations to limit saturated fat intake as "it causes you to eat more."

    The study was conducted by exposing rats and mice to fat in different ways -- by injecting various types of fat directly into the brain, infusing fat through the carotid artery or feeding the animals through a stomach tube three times a day.

    The animals received the same amount of calories and fat and only the type of fat differed. The types included palmitic acid, monounsaturated fatty acid and unsaturated oleic acid which is found in olive and grapeseed oils.

    "The action was very specific to palmitic acid, which is very high in foods that are rich in saturated-fat," said Clegg.

    官方的研究表明：一杯冰激凌確實能夠控制你的大腦活動。它說：吃了我吧。

    美國達拉斯UT西南醫(yī)學中心的一項研究發(fā)現(xiàn)，某些食物，如冰激凌和漢堡包，其中所含的脂肪直接刺激人的大腦。

    當人攝入了哪些食物，脂肪分子就開始刺激大腦向體細胞發(fā)送消息，警告它們忽略那些由瘦素、胰島素以及用于體重控制的荷爾蒙所產(chǎn)生的控制食欲的信號，這種刺激可長達三天的時間。

    研究者Deborah Clegg在一次陳述中說道，"正常來說，當我們飽食時，我們的身體最先有反應。但是，當我們正在吃一些好的食物時，情況往往就不是那樣了。

    "在這項研究中，我們所要表明的是一個人大腦的全部化學成分能夠在非常短暫的時間內發(fā)生變化。我們的發(fā)現(xiàn)成果表明，當你攝入了富含脂肪的食物時，你的大腦受到脂肪酸的刺激，隨之你的身體也開始抵制胰島素和瘦素。

    "因為大腦沒有告訴你停止攝入食物，你就會過量飲食。"

    研究者們也發(fā)現(xiàn)了一種富含于牛肉、黃油、干酪和牛奶的特殊脂肪--棕櫚酸，對促成這種機制有專門的功效。

    這項研究是用白鼠和黑鼠做實驗的，而這些科學家說，他們的科研成果被刊登在《臨床研究期刊》上，該成果證實了公認的飲食規(guī)定建議來限制飽和脂肪攝入量，因為飽和脂肪可以讓你吃得更多。

    研究者們是通過用不同途徑給白鼠和黑鼠攝入脂肪來進行這項研究的。他們直接把不同種類的脂肪注射進大腦里，或通過解剖頸動脈注入脂肪，或者通過胃管給動物喂食物，一日三次。

    這些動物攝入了等量的卡路里和脂肪，并且其中只有一種脂肪是不同的。這些脂肪種類中包括棕櫚酸、單不飽和脂肪酸和富含于橄欖油和葡萄油中的不飽和油酸。

    Clegg說："這項研究可以具體到棕櫚酸，這種酸在富含飽和脂肪的食物中含量非常高。"