Thursday February 2 2012
Would you pay a tax on sugary foods?
“Sugar is so harmful that it should be controlled and taxed in the same way as tobacco and alcohol,” according to health experts quoted in today’s Daily Express. The researchers say that sugar indirectly contributes to 35 million deaths a year worldwide.
The news is based on a comment article by US health scientists, who argue that there has been a massive rise in diseases such as heart disease, cancer and diabetes since we began eating more sugar contained in processed food. The researchers argue that many of the health effects of excess sugar consumption are similar to those of alcohol, and that sugar should, therefore, be controlled and taxed in a similar way. They advocate introducing a tax on processed foods with added sugar, limiting sales during school hours and placing age limits on purchase. Interestingly, the authors rate sugar as more dangerous to health than saturated fat and salt, which they call dietary “bogeymen”.
It is important to highlight that the researchers’ article is a comment piece and, therefore, primarily reflects their views and opinions, rather than presenting direct research on the issue. While it is certainly an interesting concept, there is still a lack of evidence supporting the effectiveness of such measures and, crucially, whether the public would actually accept them.
Where did the story come from?
The article was written by researchers from the University of California. There is no information about any external funding. It was published in the comment section of the peer-reviewed scientific journal Nature.
The article was covered fairly by the papers, many of which included comments from UK experts including the UK Food and Drink Federation, which represents food manufacturers. The BBC also quoted an expert from the British Heart Foundation, who reportedly said that taxing salt and fat alongside sugar should also be considered.
What kind of article was this?
This was a comment piece in which experts discuss the global burden of general chronic disease related to sugar consumption and the need to regulate certain dietary items. In particular, the authors draw parallels between the health effects of sugar and the use of alcohol and tobacco, arguing that sugar should be regulated in a similar manner.
It is important to highlight that this was a comment piece only and, as such, it primarily reflects the views and opinions of the authors. A formal systematic review of the literature does not appear to have been conducted and, as such, it is not certain whether all relevant evidence and resources related to sugar consumption and its health effects will have been consulted.
Also, the short piece looks at the issue from a global perspective and, therefore, is not a direct commentary on sugar consumption in the UK. In fact, a map showing average added sugar consumption per day across different nations shows that people in the UK consume a relatively low amount of sugar, at least compared with the rest of the world. Much of the article’s content may be focused on policies suited to the US, which has by far the greatest per-head sugar consumption, at more than 600 calories worth of sugar per day.
What does the article say?
The article points out that, for the first time in human history, non-communicable diseases such as heart disease, cancer and diabetes, pose a greater health burden worldwide than infectious disease. While alcohol, tobacco and diet are all targeted as risk factors for these diseases by policymakers, only the first two – alcohol and cigarettes – are regulated by governments to protect public health. (Although, as the report points out, Denmark taxes food high in saturated fats and is now considering taxing added sugar.) The authors argue that fat and salt have become the current “dietary bogeymen” in the US and Europe, but that most doctors no longer believe that fat is the “primary culprit” of such disease. Doctors are apparently calling for attention to be turned towards the dangers of excess sugar consumption.
The authors estimate that over the past 50 years sugar consumption has tripled worldwide, mainly as a result of it being added to cheap processed foods. While excess sugar is thought to be a key cause of the obesity epidemic, they argue that obesity itself is not the root cause of disease but that its presence is a marker for metabolic damage. This, they say, could explain why 40% of those with metabolic syndrome (a collection of the key metabolic changes that lead to heart disease and diabetes) are not obese.
Why do they think sugar is dangerous?
The authors say that although sugar is described as “empty calories”, a growing body of evidence suggests that fructose (one component of table sugar) can trigger processes that lead to liver toxicity and a host of other chronic diseases. “A little is not a problem but a lot kills – slowly,” they say.
The authors argue that sugar meets all the four criteria used by health policy makers to justify the regulation of alcohol. These are:
- Unavoidability. While sugar was only available as fruit and honey at certain times of the year to our ancestors, it is now present in nearly all processed foods. In some parts of the world people are consuming more than 500 calories worth of sugar per day.
- Toxicity. There is growing evidence that excess sugar has an effect on human health beyond simply adding calories and can cause many of the same problems as alcohol, including high blood pressure, high blood fats, insulin resistance and diabetes.
- Potential for abuse. The authors argue that, like tobacco and alcohol, sugar acts on the brain to encourage dependence. Specifically, it interferes with the workings of a hormone called ghrelin (which signals hunger to the brain) and it also affects the action of other important compounds.
- Negative impact on society. The economic and human costs of these diseases place excess consumption of sugar in the same category as smoking and drinking.
What do they think should be done?
While the authors accept that sugar is “natural” and a “pleasure”, they argue that, like alcohol, too much of a good thing is toxic. Strategies to reduce consumption of alcohol and tobacco show that government controls, such as taxation and imposing age limits, work better than educating people. They make several proposals for controlling sugar, including:
- taxing any processed foods with added sugar, including drinks
- reducing the hours during which retailers can sell food containing added sugar
- tightening the licensing requirements on vending machines and snack bars selling sugary products
- controlling the numbers of fast food outlets and convenience stores
- limiting sales during school hours or imposing an age limit for drinks with added sugar
Finally, they argue that regulating sugar will not be easy, but it can be done with enough pressure for change, citing bans on smoking in public places as an example of what can be achieved.
What does this mean for me?
This article will be of interest to food scientists, health policy makers and the public alike, but the use of strategies to restrict the consumption of added sugar is complicated and, indeed, controversial. The implications of such moves would need to be considered in both medical and societal terms. They would need both medical evidence to support their effectiveness and assurance that the public would accept drastic changes, such as age limits on buying sweets. For example, in recent years, Denmark has imposed taxes on fatty foods, a move that has divided opinions greatly.
It is generally accepted that excessive sugar consumption is bad for health and dietitians advise restricting sugar intake to the occasional “treat”. However, to what extent sugar is directly to blame for the rise in chronic disease and how much is due to other dietary components, such as saturated fat and salt, is open to debate. The current article does not appear to be a formal systematic review of the literature, and it is not certain whether all relevant evidence and resources related to sugar consumption and its health effects have been consulted. As such, it should be considered primarily to reflect the views and opinions of the authors.
In the UK at present, policymakers generally favour encouraging healthier eating through education and the provision of healthier options. This is carried out through public health campaigns such as 5 A DAY or by introducing new food ranges to schools. Whether this approach alone is adequate and whether healthier eating patterns should be encouraged by government regulation, is a crucial area of debate.