1 Nov 2013 --- A 20% tax on sugar sweetened drinks would reduce the number of UK adults who are obese by 180,000 (1.3%) and who are overweight by 285,000 (0.9%), suggests a study published on bmj.com. Although this is a relatively modest effect, people aged 16-29 years, as the major consumers of sugar sweetened drinks, would be impacted the most, say the authors.