Key points from article :
Vegans and vegetarians have a lower risk of heart disease and a higher risk of stroke.
3 more cases of strokes per 1,000 people compared with the meat-eaters, a 20% higher risk of stroke.
Could be linked to low vitamin B12 levels but need to investigate the connection.
Best to have a well-planned diet with a wide variety of foods says British Dietetic Association.
48,000 participants took part in this observational study for 18 years.
Study by University of Oxford, UK, published in the British Medical Journal.
