A modelling study on bmj.com suggests that a 20% tax on sugar sweetened drinks would reduce the number of obese adults in the UK by 1.3%, and by 0.9 for those who are overweight. The health gains are fairly similar across all income groups. Oliver Mytton, one of the study's authors, describes why a 20% figure was chosen and how the modelling was done. Also, liver function tests follow a different normal range during pregnancy. Catherine Williamson, professor of women’s health at King's College London, explains why. Read the articles: Overall and income specific effect on prevalence of overweight and obesity of 20% sugar sweetened drink tax in UK - http://www.bmj.com/content/347/bmj.f6189 Abnormal liver function tests in pregnancy - http://www.bmj.com/content/347/bmj.f6055

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