Caffeine is NOT insulogenic. I repeat caffeine is NOT insulogenic, and this is not a matter of opinion or interpretation, but it is a biochemical fact that caffeine actually OPPOSES the action of insulin. The only time you might want to avoid this is when you're trying to establish ketosis (because the caffeine increases preferential burning of fat over glucose therefore increasing the amount of time required to achieve ketosis). Once you're in ketosis, this preferential burning of fat if a desirable side effect of caffeine. The only other people who should go easy on the caffeine are type 2 diabetics or people with impaired insulin sensitivity. Again, this is not because caffeine is insulogenic, but merely because it IMPAIRS the action of insulin, which is already impaired in type 2's. Since I suspect a lot of folks on Atkin's diets are pretty insulin insensitive, the advice to avoid caffeine may be sound advice, at least until normal insulin sensitivity is retored. But if you're insulin sensitivity is good and you're in ketosis then ECA kicks ass!