What does this study add?
It analyses data from the EPIC-Oxford study, a major long-term research project looking at diet and health. Half of participants, recruited between 1993 and 2001, were meat-eaters, just over 16,000 vegetarian or vegan, with 7,500 who described themselves as pescatarian (fish-eating). They were asked about their diets, when they joined the study and again in 2010. Medical history, smoking and physical activity were taken into account, Altogether, there were 2,820 cases of coronary heart disease (CHD) and 1,072 cases of stroke - including 300 haemorrhagic strokes, which happen when a weakened blood vessel bursts and bleeds into the brain. The pescatarians were found to have a 13% lower risk of CHD than the meat-eaters, while the vegetarians and vegans had a 22% lower risk. But those on plant-based diets had a 20% higher risk of stroke. The researchers suggested this could be linked to low vitamin B12 levels but said more studies were needed to investigate the connection. It is also possible that the association may have nothing to do with people's diets and may just reflect other differences in the lives of people who do not eat meat.So does it show vegan and vegetarian diets are unhealthy?
Dr Frankie Phillips, from the British Dietetic Association, says not - because this was an observational study. "They looked at what people ate and followed them for years, so it's an association, not cause-and-effect," she says. "The message, for everyone, is it makes sense to have a well-planned diet, and to eat a wide variety of foods. A varied diet is the key, not "meat and potatoes every night" "Meat-eaters don't necessarily have a varied diet, because they might live on meat and potatoes for dinner every night and not have any vegetables."Has what people eat changed since this study started?
Researchers did go back to participants in 2010 to ask them again about their diets. But Dr Phillips says vegan and vegetarian diets will have changed. "This is data that's been collected from a couple of decades ago," she says. "It might well be that the typical vegetarian diet today looks very different to a vegetarian or vegan diet from 20 or 30 years ago. "The range of vegetarian and vegan convenience foods has escalated massively. It's a lot more mainstream." And we know more about the health risks linked to eating too much processed and red meat, which has been linked to an increased risk of bowel cancer..So what should go on my plate?
The NHS's the Eatwell Guide sets out the balance of foods you need, whatever kind of diet you eat:- Eat at least five portions of fruit and vegetables a day
- Base meals around higher-fibre starchy foods such as potatoes, bread, rice or pasta
- Don't forget protein - from lean meat, fish, seafood, pulses, tofu or unsalted nuts
- Include dairy or dairy alternatives
- Foods high in fat, sugars or salt should be eaten less often and in small amounts
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