Why Is Coke So Addictive?

Caffeine acts as a major appetite suppressant, meaning that it suppresses your body’s ability to produce or respond to hunger hormones. It also increases heart rate and blood pressure, which is why some people experience headaches when they drink caffeine for the first time–their digestive systems are already tuned in to their habitual slow heart rates! Caffeine doesn’t have any direct effects enhancing pleasure, but many adenosine receptors are located on nerve cells associated with relieving pain, so by blocking cortisol receptors there is often relief from headaches. This also desensitizes the receptor cells to adenosine over time, which means that someone who previously experienced nausea would drink more coke before feeling nauseous because their neurons are bored.

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