{"id":45049,"date":"2019-07-09T17:20:14","date_gmt":"2019-07-09T16:20:14","guid":{"rendered":"https:\/\/blogs.bmj.com\/bmj\/?p=45049"},"modified":"2019-07-16T14:43:00","modified_gmt":"2019-07-16T13:43:00","slug":"adam-briggs-sin-taxes-the-language-is-wrong-but-the-evidence-is-clear","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bmj\/2019\/07\/09\/adam-briggs-sin-taxes-the-language-is-wrong-but-the-evidence-is-clear\/","title":{"rendered":"Adam Briggs: \u201cSin taxes\u201d\u2014the language is wrong, but the evidence is clear"},"content":{"rendered":"

Boris Johnson has pledged to review the sugar levy on fizzy drinks if he becomes PM, but all that would prove is that the policy is right
\n<\/span><\/p>\n

Last week Boris Johnson suggested<\/a> that a good way to revamp politics after Brexit would be to base \u201ctax policy on clear evidence.\u201d<\/span><\/p>\n

He was referring to what he describes as \u201cstealth sin taxes\u201d\u2014taxes on unhealthy food and drink currently exemplified by the soft drink industry levy\u2014and pledged a review into their effectiveness. Aside from any of the potential politics or conflicts of interest underlying these claims, sugary drink taxes are an important piece of any evidence based public health policy.<\/span><\/p>\n

We all know about the obesity crisis: over a third of 10-11 year olds and two thirds of adults in England<\/a> are overweight or obese,<\/span> at an estimated cost to the NHS of \u00a36bn (\u20ac6.67bn; $7.47bn) in 2014<\/a>. <\/span>Reversing this crisis is hugely challenging. Crudely speaking, weight gain is caused by eating too much and moving too little, but our diet and activity levels are heavily influenced by social, environmental, and economic conditions<\/a>,<\/span> as well as the interplay between these and our genetics<\/a><\/span>\u00a0and our physical and mental health. Hence, my colleagues at the Health Foundation have called for cross government action<\/a> and investment<\/span> on the wider determinants that influence our health. This all amounts to a complex problem with no single, over-riding cause. And it needs a complex solution\u2014a key part of which should be a soft drink tax, the evidence suggests.<\/span><\/p>\n

So, why target just soft drinks? For a start, nearly all of us eat too much sugar<\/a>,<\/span> and drinks play a key role, particularly in children. Teenagers consume nearly three times their recommended amount of \u201cfree\u201d sugar\u2014any added sugar, including in juice or syrup\u2014over a fifth of which comes from soft drinks.<\/span><\/p>\n

These drinks are also associated with a range of poor health outcomes, having no nutritional benefit beyond their calories. Randomised controlled trials have shown how they can lead to weight gain in adults<\/a><\/span>\u00a0and children<\/a>,<\/span> and increasing numbers of studies associate them with diabetes<\/a>,<\/span>\u00a0tooth decay<\/a>,<\/span>\u00a0heart disease, and hypertension<\/a>.<\/span>\u00a0On top of this, it makes sense to focus on soft drinks because the Treasury can easily define them, and the drinks that people would switch to are generally healthier.<\/span><\/p>\n

Societal costs<\/b><\/p>\n

Taxes are often used to correct \u201cnegative externalities\u201d: the costly consequences of some products not borne in the original price but that are then \u201cinternalised\u201d by a tax. For example, taxes on tobacco don\u2019t just change behaviour<\/a><\/span>\u2014they internalise the health and societal costs of the resulting heart disease and cancers. The same is true of alcohol taxes and liver disease, and it also applies to soft drink taxes and obesity.<\/span><\/p>\n

Over 30 countries<\/span><\/a>\u00a0have implemented some sort of soft drink tax, and \u201creal world\u201d data increasingly show their effects on consumers. Mexico has been particularly well studied with its peso-per-litre tax\u2014a price increase of around 10%, resulting in an 8% reduction in purchases<\/a><\/span>\u00a0over the first two years. More recently, data from Philadelphia\u2019s tax of 1.5 cents per ounce showed a 40% reduction in sales<\/a>,<\/span>\u00a0and a meta-analysis of soft drink tax evaluations published just last month found that purchases fall by around 10% with a 10% price rise<\/a>.<\/span><\/p>\n

One of Johnson\u2019s main concerns was whether these taxes \u201cunduly hit those on lower incomes.\u201d Here, he has a point: soft drink taxes\u2014like National Insurance, VAT, or tobacco taxes\u2014are regressive. People with less money pay a higher proportion of their income.<\/span><\/p>\n

But evidence from a 2016 systematic review<\/a><\/span> and the more recent Mexican data<\/a><\/span> suggest greater levels of behaviour change, and therefore greater health benefits, among lower socioeconomic groups. Furthermore, population level interventions requiring lower levels of agency, such as taxes, are more effective and more equitable<\/a><\/span>\u00a0than interventions targeting the individual, such as gym or cookery classes. But, irrespective of these arguments, rather than scrapping a regressive tax aimed at improving population health, why not simply make the remaining tax system proportionately more progressive?<\/span><\/p>\n

Public support<\/b><\/p>\n

Taxes on sugary drinks are a key part of tackling obesity. They\u2019ve been reviewed and supported by Public Health England<\/a>,<\/span>\u00a0the Health Select Committee<\/a>,<\/span> the British Medical Association<\/a>,<\/span> and numerous medical royal colleges<\/a>.<\/span><\/p>\n

Johnson\u2019s pledge is likely to have as much to do with ideology as a desire for more evidence (of which plenty is forthcoming, from the UK\u2019s formal soft drink tax evaluation<\/a>).<\/span> The pledge has been cheered by some<\/a><\/span> in his party and abhorred by others<\/a>,<\/span>\u00a0but perhaps we needn\u2019t be concerned. Soft drink taxes have public support<\/a><\/span>: only last week a YouGov poll reported an approval rating of 55%<\/a><\/span>\u00a0for taxes on unhealthy food or drink, including 54% among Conservative voters.<\/span><\/p>\n

Note that the poll referred to taxes on unhealthy food and drink, not to \u201csin taxes\u201d: there\u2019s nothing immoral about consuming soft drinks or chips. What may be immoral is stigmatising and labelling people who are overweight as sinners, while not supporting us all to stay healthy against a tide of environmental triggers for overconsumption.<\/span><\/p>\n

So, in a week when the news is led by stories that obesity is now causing more cancers than smoking<\/a> in four subtypes,<\/span>\u00a0I think that we can all get behind basing tax policy on clear evidence.<\/span><\/p>\n

 <\/p>\n

\"\"<\/a>Adam Briggs<\/strong> is a public health specialty registrar based at the Health Foundation and an academic visitor at the Nuffield Department of Population, University of Oxford.<\/span><\/em><\/p>\n

Competing interests<\/strong>: I have read and understood BMJ policy on declaration of interests and declare the following interests: I am a member of the UK Faculty of Public Health and past member of the UK Health Forum, both of which have position statements supporting a soft drink tax. I am a co-applicant on the NIHR funded five year evaluation of the UK Soft Drink Industry Levy. I have written various research and commissioned articles on soft drink taxes.<\/span><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Boris Johnson has pledged to review the sugar levy on fizzy drinks if he becomes PM, but all that would prove is that the policy is right […]<\/p>\n

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