![]() We know age and tobacco consumption are causally linked to higher rates of miscarriage,” she says. “Women who drink coffee in pregnancy are likely to be older and are more likely to smoke. “The big concern is the possibility that caffeine consumption is linked to miscarriage, especially in the first three months,” she says.īut, she says, there isn’t much randomised data on this, and drawing conclusions from observational data isn’t reliable. ![]() This would suggest that if coffee does lower the risk of heart disease and cancer, it might be more powerful than we think – it’s overriding the effects of unhealthy behaviours.Įmily Oster, economist and author of the book Expecting Better, which explores the data behind around pregnancy recommendations, also found guidance around coffee to be inconsistent. Coffee-drinkers in Gunter’s study were more likely to smoke and had unhealthier diets than non-coffee drinkers. The potential benefit of coffee could go further. Gunter says there’s enough consensus across observational studies to confirm that people who drink up to four cups of coffee a day have fewer diseases compared to those who don’t drink any. These findings are consistent with research from other parts of the world, including the US. Those who drank more coffee had a lower risk of dying from heart disease, stroke and cancer. In 2017, Gunter published the results of a study that looked at the coffee-drinking habits of half a million people across Europe over a period of 16 years. Some studies have shown an association between coffee drinking and lower severity, and recurrence, of colon cancer in patients, for example. Not only that, but more research has found that coffee may actually have a protective effect. However, the IARC concluded in 2016 that coffee is not carcinogenic, unless it’s drunk very hot – above 65C (149F). But what does the research tell us – and is coffee consumption providing health benefits, or risks?Ĭoffee has been associated with an increased risk of cancer because it contains acrylamide, a carcinogenic substance found in foods including toast, cakes and chips. With more, larger-scale population studies emerging over the last decade, Gunter says, scientists now have data from hundreds of thousands of coffee-drinkers. ![]() “Research from the 1980s and 90s concluded that people who drank coffee had a higher risk of cardiovascular disease – but it’s evolved since then.” “Traditionally, coffee has been seen as a bad thing,” says Marc Gunter, head of the section of nutrition and metabolism at the International Agency for Research on Cancer (IARC). Humans have been drinking coffee, a natural source of caffeine, for centuries, but there have been mixed messages around its effect on human health for decades. Caffeine is the most popular psychoactive drug in the world.
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