在线国产一区二区_成人黄色片在线观看_国产成人免费_日韩精品免费在线视频_亚洲精品美女久久_欧美一级免费在线观看

  Home>News Center>World
         
 

Caffeine impairs sugar metabolism
By Anne Harding (Agencies)
Updated: 2005-03-20 14:24

Caffeine intake makes insulin more resistant to changes in blood sugar levels, Canadian researchers report. This effect was observed both in patients with and those without diabetes and could not be reversed with regular exercise or weight.

But before you throw away your coffee mug -- these results may not apply to the popular caffeinated beverage, the investigators note. In fact, previous research has suggested that drinking coffee may cut the risk of diabetes.

When sugar levels in the blood get too high, insulin is released, which brings the levels back down. With insulin resistance, also known as decreased insulin sensitivity, sugar levels need to get much higher before insulin release is triggered. Over time, this resistance can cause problems and lead to diabetes.

"Through mechanisms that have yet to be firmly established, caffeine attenuates any of the beneficial effects of exercise or weight loss on insulin resistance," Dr. Robert Ross of Queens University in Kingston, Ontario, told Reuters Health.

While the clinical implications remain unclear, Ross added, the findings are a "red flag" for doctors and are particularly important for obese patients and those with diabetes.

Ross and his team evaluated sugar metabolism in 23 men before and after a three-month exercise program. Before and during the exercise program, the men were given caffeine or inactive "placebo." The subjects included eight sedentary lean men, seven obese men with type 2 diabetes, and eight obese men without diabetes.

Before the exercise program, caffeine reduced insulin sensitivity by 33 percent in the lean and obese men and 37 percent in the men with diabetes compared to placebo. After the exercise program, insulin sensitivity fell 23 percent after caffeine intake in the lean men, 26 percent in the obese men, and 36 percent in the diabetic men.

Comparison of the two study phases, showed that exercise did not improve insulin resistance related to caffeine intake.

The findings, published in the medical journal Diabetes Care, seem to contradict recent reports that coffee intake may cut the risk of diabetes, Ross noted. However, coffee contains several other substances that may affect sugar metabolism, such as antioxidants, potassium and magnesium. "When you give somebody caffeine without all of the other substances that are in coffee you have a very different situation," he added.



 
  Today's Top News     Top World News
 

Death toll in Shanxi mine blast rises to 42

 

   
 

Thousands in Taipei protest shooting

 

   
 

China to implant ID chips in pandas

 

   
 

Pakistan explosion kills 27, injures 18

 

   
 

Rice to kick off whirlwind China tour

 

   
 

Protests in US, Europe as Bush defends war

 

   
  Rice presses Japan to end beef boycott
   
  Israel backs temporary Palestinian truce
   
  Russia, EU leaders reach agreements
   
  Car bomb wounds six in Lebanese capital
   
  Spain arrests Syrian man in train bomb probe
   
  Colombian congressman shot to death
   
 
  Go to Another Section  
 
 
  Story Tools  
   
  News Talk  
  Are the Republicans exploiting the memory of 9/11?  
Advertisement
         
主站蜘蛛池模板: 亚洲精品日韩精品 | 91精品国产日韩91久久久久久 | 91九色国产| 久久精品美女 | 日韩免费看片 | 超碰97在线免费观看 | 一级特黄妇女高潮 | 成人精品三级av在线看 | 欧美理论片在线观看 | 国产不卡视频 | 色综合99 | 色爱综合网 | 国产一级片网站 | 日本大尺度吃奶做爰久久久绯色 | 亚洲一区在线观看视频 | 一区二区日韩 | 成人羞羞国产免费游戏 | 久久久精品免费 | 国产三级视频 | 国产日韩在线播放 | 亚洲一区二区免费视频 | 色在线播放 | 国产一区二区视频在线播放 | 国产区视频在线 | 国产黄色大片 | 久久久精品免费 | 国产色站| 欧美做受 | 91久久久久久久 | 国精产品99永久一区一区 | 狠狠操狠狠爱 | a在线免费观看 | 野外(巨肉高h) | 中文字幕在线观看一区二区三区 | 一级免费黄色片 | 黄色一级毛片 | 亚洲精品影院 | 日韩一区二区在线观看视频 | 国产69精品久久久久久 | 国产又黄又粗 | 一区二区精品在线 |