And people with heart disease should avoid instant coffee because it contains high levels of potassium, which can cause dangerous changes in heart rhythm, says Dr Jackson. That first cup of the day can trigger a need for the loo. Caffeine also interferes with the absorption of iron, so avoid having it at the same time as iron-rich food, such as red meat. Contrary to common belief, coffee does not ease constipation. In fact, in the long term coffee can make constipation worse because caffeine can lead to dehydration, resulting in hard stools that are more difficult to pass.
And avoid drinking coffee without food. Too much coffee could raise your risk of crumbly bones or osteoporosis, because it may speed up bone loss.
Caffeine makes the osteoblasts — the cells involved in forming new bone —less efficient and may even kill them, according to a study published in the Journal of Orthopaedic Surgery and Research in Calcium is essential for strong bones. She advises no more than three cups a day and adding milk. You have to drink quite a lot of black coffee to stain your teeth — five to six cups a day, dentists say. Worried your morning espresso stains your teeth? Surprisingly, tea may be worse.
A good whitening toothpaste can remove up to 90 per cent of stains within 14 days, he says. If enamel is cracked or damaged, you might need professional help. In more good news for aficionados, Dr Druian says that coffee — including decaf — contains a chemical which effectively stops the tooth-eating bacterium Streptococcus mutans attaching to your teeth.
The same chemical is what gives coffee its sweet, earthy taste. A simple solution is to restrict coffee drinking and eat little and often to stimulate production of saliva. Drinking water with coffee can also help. Caffeine is also a bladder irritant, which can make an overactive bladder problem worse. The study found people who drank three to five cups a day were 20 per cent less likely to develop this form of dementia.
It also seems that both caffeine and the antioxidants in coffee reduce inflammation in the brain and can slow down the deterioration of brain cells, especially those found in the areas of the brain associated with memory. Coffee is a diuretic — it stimulates the kidneys to excrete more fluid, making you need the loo more often.
This is because caffeine interferes with the way fluid is reabsorbed into the blood, says Professor Chris Eden, a consultant urologist at the Royal Surrey County Hospital in Guildford.
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Caffeine is also a bladder irritant, which can make an overactive bladder problem worse, he says. Coffee is rich in oxalates, compounds that bind with calcium in the blood to create calcium oxalate, a major component of kidney stones. People with a history of kidney stones had increased levels of calcium in their urine after drinking two cups of coffee each day, according to a U. And coffee may be linked to a lower risk of skin cancer, thanks to its antioxidants. These are thought to mop up free radicals, the damaging molecules linked to cancer and other diseases.
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A study published in found that people who drank the most coffee were least likely to get malignant melanoma. Drinking coffee could give your muscles a boost.
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Caffeine appears to trigger the muscles to start burning up fat for energy once the energy from carbs has run out. There are plenty of studies suggesting that drinking plenty of coffee is linked to a lower risk of type 2 diabetes. Drinking coffee could give your muscles a boost and provide more staying power. Researchers at the Australian Institute of Sport found that a single cup of coffee helped athletes exercise for almost a third longer. Cyclists were either given water to drink as they pedalled, or coffee or cola, which also contains caffeine.
Those who drank coffee or cola were able to go on for longer. Studies have shown that people who regularly drink coffee to remain alert become tolerant to caffeine, so they are no more alert after drinking it than non-coffee drinkers. Caffeine also stimulates the release of feel-good hormone dopamine, temporarily reducing fatigue. And it works quickly — caffeine is absorbed quicker in liquid form, says dietitian Nigel Denby.
It takes around three to six hours for caffeine levels to drop back to half of what they were at their peak. Caffeine suppresses melatonin, the hormone that helps us relax and prepare for sleep, and interferes with a brain chemical, adenosine, which normally slows down nerve cells in the brain, making us drowsy. Then coffee can be a pleasure. The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline.
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