Caffeine triggers a range of unexpected effects in the body — from changes in gut function to an influence on how we perceive pain. That's according to a report published by SciTechDaily, infohub.kz reports.
The morning drink stimulates the release of gastrin, a hormone that prompts the stomach to produce more acid and speeds up contractions of the intestinal walls. That is precisely why a cup of coffee often sends people rushing to the bathroom. Caffeine also acts as a mild diuretic, boosting filtration in the kidneys and making the body need to urinate more often.
With regular consumption, the body adapts and becomes less sensitive to caffeine. The brain begins to offset the stimulant's effect by creating more receptors for adenosine, a substance that causes feelings of tiredness. As a result, the usual dose eventually stops delivering the same burst of energy, while suddenly giving up the drink leads to headaches and feeling run down.
Researchers also note caffeine's effect on sensory perception and sleep. Compounds in coffee can temporarily block sweetness receptors on the tongue, making ordinary foods taste less sweet. The drink also improves blood circulation and may enhance the effect of painkillers, but drinking coffee in the second half of the day disrupts circadian rhythms and interferes with a full night's rest.