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http://www.diabetes.org/diabetes-research/summaries/lee-caffeine.jsp
"The researchers found that, in all groups, taking a pill with the same amount of caffeine as 2-3 cups of coffee resulted in a significant decrease in glucose uptake, which caused a rise in blood glucose levels. After exercise, glucose uptake was slightly better, but eating or drinking caffeine was still linked with a significant decline in glucose uptake.
...
Caffeine is linked with a decline in the body's ability to turn glucose into energy, regardless of exercise, obesity, or type 2 diabetes."
Could there be a link between that and a decline in cycling performance? Other reports speak of less muscle pain because of caffeine. So what is it?
Also, how much caffeine is illegal/doping and how can you tell what your body's limit is?
"The researchers found that, in all groups, taking a pill with the same amount of caffeine as 2-3 cups of coffee resulted in a significant decrease in glucose uptake, which caused a rise in blood glucose levels. After exercise, glucose uptake was slightly better, but eating or drinking caffeine was still linked with a significant decline in glucose uptake.
...
Caffeine is linked with a decline in the body's ability to turn glucose into energy, regardless of exercise, obesity, or type 2 diabetes."
Could there be a link between that and a decline in cycling performance? Other reports speak of less muscle pain because of caffeine. So what is it?
Also, how much caffeine is illegal/doping and how can you tell what your body's limit is?