[Mase]

people who are sedentary do not use it up and it triggers an insulin response and yu will gain weight

Are you saying it's the insulin response that causes people to gain weight? If so, people who consume large amounts of caffeine would also be more likely to be overweight or obese. I've never seen anything correlating caffeine consumption with obesity.

[RaceBannon]

neither have I ever read that caffiene raises or lowers insulin, got a link?