Morning sickness 'regulates diet'

Morning sickness might have evolved to ensure pregnant women do not digest too much unhealthy food, say scientists. They found evidence that nausea and vomiting in pregnancy is associated with high intake of sugar, alcohol, oils and meat. In contrast, cereals were least likely to trigger sickness. The University of Liverpool analysis of 56 previous studies in 21 countries appears in the Royal Society's Biological Journal. Morning sickness occurs in the first three months of up to 80% of pregnancies. Until recently, it was thought to be simply an unfortunate by-product of dramatic hormonal changes during early pregnancy. However, research has suggested that morning sickness might have positive consequences - such as a reduced risk of miscarriage.

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