It can make us more mentally alert – which is great if we need waking up – but it can also make it harder to get to sleep if we drink it too close to bed time.
Adenosine normally promotes sleepiness, which is why caffeine is a potent mental stimulant.
Here are some of caffeine’s lesser-known impacts on our physical health.
Medical fraility is a term used by doctors to mean that people have low muscle strength and may also have other conditions like vision or hearing problems that lead to a higher risk of becoming ill.
Not the only way to keep your strength up (Photo: Maskot/Getty)“These findings suggest that habitual daily coffee consumption may contribute to improved health in older individuals,” said the Dutch researchers. The results were published in the European Journal of Nutrition.
Heart health
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Coffee does have some noticeable immediate effects on the cardiovascular system in people who are not used to it. It can slightly raise heart rate and blood pressure.
If someone drinks much more than usual, though, caffeine may cause heart palpitations, when the heart beat becomes irregular. It can sometimes be noticed as a fluttering sensation in the neck or chest.
The largest study to investigate this question, in half a million Britons, found that having up to three cups of coffee a day is linked with lower rates of heart disease than drinking no coffee, and people with even higher coffee intakes had similar rates as abstainers.
As a stimulant, caffeine speeds up movement of food through the gut, and can trigger a bowel movement, especially when taken as a morning coffee. “In the morning our digestive system is more primed and ready to have a bowel movement,” said Rebecca McManamon, a consultant dietitian and spokesperson for the British Dietetic Association.
And as coffee is made from the beans of the coffee plant, it is a source of soluble fibre, which also helps promote regular bowel movements.
Source of hydration
Caffeine is known to mildly stimulate fluid output, so some people mistakenly think that tea and coffee shouldn’t be seen as a source of hydration – but that’s wrong, said McManamon.
So if you are trying to make sure you don’t get dehydrated in the hot weather, it’s fine to carry on drinking coffee and tea as usual for hydration. “Some people don’t enjoy drinking water,” she said. “If they do drink coffee, that’s going to help them drink enough in this warm weather, so that’s absolutely fine.”
Cheese is a good source of calcium (Photo: lechatnoir/Getty Images/E+)Reducing calcium levels
“In theory, this could lead to your bones losing strength if you don’t consume enough calcium to replace it,” says the Royal Osteoporosis Society.
Other sources of calcium include cheese and other dairy foods, as well as green leafy vegetables.
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