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A lot of it really depends on the amount of caffeine in the drink. If you read my comments below, you’ll see how much caffeine it takes to increase your cortisol by 30%. You have to remember that supplement companies, in general, don’t care about your health or even your performance. What they care about is that you “feel” something when using their product and therefore you “believe” it’s doing some good so that you come back and buy their product again and again. That’s not to say that caffeine doesn’t have performance benefits because the literature is very clear that it does, but it’s a double-edged sword. So you have to weigh the pros and the cons with it and decide for yourself if it’s worth it based on your own individual performance and body transformation goals.
Now imagine you’re a thirsty plant. It hasn’t rained in weeks and there is no moisture in the soil around your roots. You’re running dangerously low on water. What can you do to prevent yourself from losing any more precious H2O? Close the stomata! How do plants do it? Abscisic acid travels to the guard cells, sending a message that water is scarce. The guard cells spring to attention, and a rush of charged particles exit the guard cells, which subsequently triggers water inside the guard cell to leave, too. The guard cells shrivel and the stomata close! No more water is able to exit the plant through the stomata.