A quarter of miscarriages may be preventable, research suggests.
Being underweight or obese before conception, working nights, drinking alcohol in pregnancy and lifting heavy loads could all increase the risk, experts said.
They said if women cut these risks to very low levels, 25% of miscarriages could be prevented. The large study of more than 91,000 pregnancies also confirmed that one of the biggest factors influencing miscarriage is the mother's age, with women over 30 having a higher chance of miscarrying.
However, other researchers warned the study did not show miscarriage was "caused" by any of the factors and pointed to other limitations.
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