Proof, is where. I've seen a TON of studies showing caffeine induces insulin resistance, and there is no rebound within 30 or 45 minutes. That is ridiculous because of caffeine's half life
Fonz said:1. Caffeine increases FFA breakdown through an increase in c-Amp levels(Cyclic Adenosine Monophosphate)
2. It basically spares muscle glycogen in favor of an increase in FFA breakdown.
3. Caffeine IMO only raises blood sugar only when you have liver glycogen. Your liver basically dumps its glycogen(Glucose + potassium + water) into your bloodstream. This increases blood glucose levels.
4. Caffeine can cause REBOUND hypoglycaemia. But this largely depends on your insulin sensitivity. I never have, (I did use a BG monitor) but I have seen people who do.
And there is a difference between the caffeine in Coffee (No ergogenic effect seen) and that of Caffeine anhydrous tablets (Ergogenic effect definately seen). So if you want an added boost for your workouts/training, coffee won't cut it. You need caffeine tablets.