If you’re an adult over the age of 18, and not pregnant, then the safe daily amount is up to 400mg per day (about four mugs of instant coffee or five mugs of tea). The recommended daily amount of caffeine depends on a few things. How much caffeine should you have in a day? But more research is needed before doctors can be sure if caffeine lowers your risk of disease. These include type 2 diabetes and Parkinson’s disease. Some studies looking at tea and coffee intake (not caffeine specifically) have shown that drinking one to three cups of coffee a day may be linked to a lower risk of certain diseases. In 2016, the International Agency for Research on Cancer (IARC) confirmed that based on the current evidence available, caffeine is not thought to cause cancer. Researchers have also investigated the connection between coffee and cancer. But research shows that for most people, a moderate amount of caffeine (around four or five cups of tea or coffee per day) isn’t likely to influence your heart rhythm, cholesterol levels and overall heart health. You might have heard questions about whether caffeine can affect your heart health. These could include anxiety, restlessness, an irregular heartbeat, headaches or insomnia. Too much caffeine – either over the course of the day or in one large dose (like in some energy drinks) – can sometimes cause unwanted side effects. Too much can lead to unpleasant side-effects For example, some people with irritable bowel syndrome (IBS) report that caffeine is a trigger, leading to symptoms such as diarrhoea. If you have certain medical conditions, you may be particularly sensitive to the effects of caffeine. In fact, tea and coffee contribute towards your daily fluid intake. You might find yourself going to the loo more often, but there’s no evidence to suggest it actually dehydrates you. Make you urinate (pee) moreĬaffeine stimulates your bladder to produce pee (urine) more quickly than usual. A moderate amount is around 400mg of caffeine or four cups of instant coffee. But, if you regularly drink a moderate amount of caffeine, the effect is reduced. Increase your blood pressureĬaffeine can increase your blood pressure by a small amount for a few hours after you eat or drink it. So it’s no surprise that you might turn to a cup of coffee to get you through an afternoon slump or a long night shift. It’s well-known for its effect on your brain and central nervous system (CNS), helping to keep you alert and stopping you from feeling tired. What are the physical effects of caffeine? Stimulate your brain and nervous systemĬaffeine acts as a stimulant, which means it increases the activity of your body’s systems.
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