Briggs et al Overall and income specific effect on prevalence of overweight and obesity 0f 20% sugar sweetened drink tax in UK: econometric and comparative risk assessment.
2013 BMJ vol 347 pp 14
Leader on this topic
Block BMJ vol 347 p 7
In the United States 12-19 year olds ingest 300 cals a day in sweetened drinks.
Adults about 2/3 of this amount
Whilst substantial the figures for the UK are less.
Several European countries , eg Hungary, Finland and France have introduced a tax on sugared drinks.
The paper by Briggs suggest that such a tax would significantly reduce the consumption of such drinks and reduce the number of obese individual in the UK by 1.3%.
Statistics on the effect of the tax in Hungary, Finland and France would be a useful first step.