Jeffrey Salazar
The taxation of sugary drinks, also known as soda taxes, is a matter of public debate in many countries. These taxes are designed to reduce the consumption of sweetened beverages by making them more expensive to purchase, with the aim of improving public health outcomes and reducing obesity and associated health issues such as diabetes and heart disease. While some jurisdictions only tax sugary drinks, others include artificially sweetened diet drinks in their taxation policies. For example, Philadelphia levies a tax on all sweetened beverages, including diet drinks, while California's four most populous states apply sales tax to sugary drinks but exempt diet soda. The decision to include or exclude diet drinks in such taxation policies is influenced by various factors, including health considerations, tax objectives, and potential substitution effects.
| Characteristics | Values |
|---|---|
| Purpose | Reducing consumption of sweetened beverages and improving health outcomes |
| Targeted Drinks | Carbonated soft drinks, sports drinks, energy drinks, fruit juices with added sugar |
| Exempted Drinks | Fruit juices without added sugar, dairy-based drinks, 100% fruit juice, bottled water |
| Implementation | Local, state, and national governments have levied excise taxes; varies by jurisdiction |
| Tax Structure | Based on volume, sugar content, or a mixed approach; tax rates range from 0.0716 euro to 2 cents per liter |
| Health Impact | Potential to reduce obesity, diabetes, and other health issues associated with sugar consumption |
| Diet Drinks | May be included in taxes due to potential health risks, but evidence is less certain |
| Revenue Impact | Varies, ranging from $1 million to $75 million annually in different cities |
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What You'll Learn
Are diet soft drinks harmful to health?
While diet soft drinks are often marketed as a healthier alternative to regular soft drinks, their health benefits are questionable. Diet soft drinks contain artificial sweeteners such as aspartame, acesulfame potassium, sucralose, and stevia, which are considered "non-nutritive," meaning they provide little to no nutritional value or energy when consumed.
Some studies have linked the consumption of diet soft drinks to negative health effects. For example, research suggests that even one or two diet sodas per day may increase the risk of cardiovascular problems, including irregular heartbeat and high blood pressure. Additionally, the artificial sweeteners in diet soda can trigger a response in the brain similar to that of real sugar, leading to potential weight gain and disrupted hunger signals. There is also evidence that artificial sweeteners may negatively impact the balance of bacteria in the gut microbiome, affecting blood sugar control and possibly inhibiting the immune system's ability to respond to infections.
The potential health risks of diet soft drinks have sparked debates about whether they should be included in sugary drink taxes, also known as soda taxes or sweetened beverage taxes (SBTs). These taxes are designed to reduce the consumption of sweetened beverages by making them more expensive. While some jurisdictions, like France, have chosen to include both regular and diet soft drinks in their taxation, others have excluded artificially sweetened drinks. The decision to include or exempt diet drinks from taxation often depends on the primary goal of the tax and the assessment of the relative health concerns posed by sugary drinks compared to their artificially sweetened counterparts.
While there is ongoing debate about the inclusion of diet drinks in sugary drink taxes, most healthcare providers would not recommend their consumption. However, they acknowledge that choosing diet soda over regular soda can have some benefits, especially for individuals who consistently consume regular soda and are not ready or willing to quit altogether. Ultimately, healthcare professionals advise that moderation is key, and it is better to quench your thirst with healthier alternatives like water, seltzer, or unsweetened tea or coffee.
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How do soda taxes work?
A soda tax is a tax or surcharge (food-related fiscal policy) designed to reduce the consumption of sweetened beverages by making them more expensive to purchase. It is a matter of public debate in many countries, with beverage producers like Coca-Cola often opposing it. Advocates such as national medical associations and the World Health Organization promote the tax as an example of a Pigouvian tax aimed at discouraging unhealthy diets and offsetting the growing economic costs of obesity.
Soda taxes are generally imposed as a per-ounce excise tax on drinks sweetened with sugar. No state currently levies taxes on soda alone, but a few localities do. While often called soda taxes, these sugar-sweetened beverage taxes also apply to iced teas, fruit drinks, sports drinks, and most other drinks with added sugar (with specific exemptions). Six localities levy this type of tax. Additionally, Philadelphia levies a per-volume soda tax on all sweetened drinks (i.e., Philadelphia also taxes diet soda).
All per-unit soda taxes in the United States are based on an eligible drink’s volume and not its sugar content. That is, an eight-ounce drink with two teaspoons of sugar (e.g., iced tea) is taxed the same rate as an eight-ounce drink with seven teaspoons of sugar (e.g., soda). This tax is simple and allows distributors to collect a set amount based on sales. It also works well if the government’s primary goal is raising tax revenue. Notably, Philadelphia’s tax, which taxes all sweetened beverages, including diet drinks, is specifically designed to generate revenue: the tax was sold as a means of funding education programs and not primarily for improving health outcomes.
If the primary goal of the tax is improving public health by reducing sugar consumption, governments should consider taxing a beverage's sugar content. Taxing sugar content could encourage consumers to choose lower-sugar options and possibly encourage manufacturers, distributors, and retailers to stock and market these products.
Some tax measures call for using the revenue collected to pay for relevant health needs: improving diets, increasing physical activity, obesity prevention, nutrition education, advancing healthcare reform, etc. However, these taxes must either be focused on raising revenue or decreasing soda consumption; they cannot do both. Soda taxes are an unstable source of revenue because if the tax is successful at deterring consumption, the decline in consumption will result in a shrinking revenue stream for the programs it is meant to fund.
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Should diet drinks be included in soda taxes?
The inclusion of diet drinks in soda taxes is a complex issue that requires careful consideration of various factors. One of the primary objectives of soda taxes is to improve public health by reducing sugar consumption and lowering the incidence of obesity, diabetes, and other related health issues. While sugary drinks have been associated with higher rates of chronic diseases, the evidence of harm from diet drinks is less certain. Some studies have shown potential benefits of diet drinks, such as short-term weight loss, while others have suggested possible associations with adverse health effects like diabetes, high blood pressure, and stroke.
One key consideration is the potential impact on consumer behaviour. Excluding diet drinks from soda taxes may strongly incentivize their consumption as they are often marketed as healthier alternatives. For example, in the UK, sales of low- and zero-sugar drinks rose significantly in the years following the announcement of the Soft Drink Industry Levy, indicating that consumers may switch to these options when faced with higher prices for sugary drinks. On the other hand, including diet drinks in soda taxes could discourage their consumption, especially if the tax leads to a notable price increase.
Another factor to consider is the composition of diet drinks. Many diet drinks contain artificial sweeteners like aspartame, which has been classified as 'possibly carcinogenic to humans' by the International Agency for Research on Cancer (IARC). However, the evidence for the carcinogenic effects of artificial sweeteners is limited and not universally accepted. If governments choose to tax diet drinks, they must carefully evaluate the latest guidance and research on artificial sweeteners to make an informed decision.
Additionally, the design of the tax itself is important. Most soda taxes are based on a drink's volume, with some variations in tax rates per ounce or liter. However, if the primary goal is to reduce sugar consumption, a tax based on sugar content could be more effective. This approach would encourage consumers to choose lower-sugar options and might incentivize manufacturers to reduce the sugar content of their products. A mixed tax structure could also be considered, with drinks containing artificial sweeteners taxed based on volume.
Ultimately, the decision to include or exclude diet drinks in soda taxes should be based on a comprehensive assessment of the available scientific evidence, the intended objectives of the tax, and the potential impact on consumer behaviour. While there are valid arguments on both sides, prioritizing public health and carefully monitoring the effects of diet drinks may provide a stronger basis for effective policy decisions.
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What are the objectives of soda taxes?
The primary objective of soda taxes is to reduce the consumption of sugary drinks, which have been linked to various health issues such as obesity, type 2 diabetes, and dental caries. By increasing the price of these drinks through taxation, the demand for them is expected to decrease, leading to potential improvements in public health. This approach has been compared to the successful implementation of tobacco taxes, which have effectively reduced tobacco consumption. Additionally, soda taxes are intended to generate revenue, which can be used to fund relevant health initiatives, such as improving diets, increasing physical activity, obesity prevention, and advancing healthcare reform.
The inclusion of diet soft drinks in soda taxes is a complex issue. Some jurisdictions, like France, do include diet soft drinks in their taxation schemes, while others choose to exclude them. The decision often depends on the health effects associated with consuming artificially sweetened beverages. If these drinks are found to have significant health concerns, they may be included in soda taxes. However, if the primary goal is to improve health, and there is uncertainty about the health impact of diet drinks, they may be excluded from the taxation base.
The taxation of diet soft drinks also depends on the specific tax structure implemented. Some tax schemes, like the one in Poland, apply a base tax rate to all drinks containing added sugar or artificial sweeteners, with additional taxes based on the amount of sugar present. In such cases, diet drinks with low or no sugar but containing artificial sweeteners would be taxed at a lower rate compared to sugary drinks. This approach provides an incentive for manufacturers to reduce sugar content and promote healthier alternatives.
The debate around taxing diet soft drinks is further complicated by emerging research. For example, aspartame, a commonly used artificial sweetener, has been classified as 'possibly carcinogenic to humans' by the International Agency for Research on Cancer (IARC). This finding has raised concerns about the potential health risks associated with consuming artificial sweeteners. However, other organizations, such as the Food and Agriculture Organization/WHO Joint Expert Committee on Food Additives, have deemed the evidence for cancer in humans 'not convincing'.
Ultimately, the objectives of soda taxes are to improve public health by reducing sugar consumption and generating revenue to support health-related initiatives. The inclusion of diet soft drinks in these taxes varies depending on the jurisdiction and the evolving understanding of the health impacts of artificial sweeteners.
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How do consumers respond to soda taxes?
The consumer response to soda taxes is varied and complex, and the effectiveness of such taxes in reducing sugar consumption is still being evaluated. Soda taxes are designed to reduce the consumption of sweetened beverages by making them more expensive to purchase. The aim is to improve public health, particularly in relation to obesity and diabetes.
Some studies have shown that soda taxes do work in reducing consumption. For example, in Berkeley, California, a penny-per-ounce levy on sugary drinks was passed in 2014, and three years later, consumption of soda had halved. A study in Catalonia, Spain, also found that an SSB tax introduced there led to a 2.2% overall reduction in sugar purchases from beverages. In Hungary, a tax on sugary drinks and foods resulted in a 22% reduction in energy drink consumption and a 19% reduction in the intake of sugary soft drinks.
However, the effectiveness of soda taxes is contested. Some argue that consumers may simply switch to other unhealthy alternatives, such as beer or other high-calorie options, if soda becomes too expensive. There is also evidence that diet drinks, which are often exempt from soda taxes, see increased sales when soda taxes are introduced. This may be a healthier alternative, but there are also health concerns around the artificial sweeteners used in these drinks.
The impact of soda taxes on consumer behaviour is also uncertain due to the complex nature of consumer responses. While some studies show a reduction in purchases of taxed beverages, it is also found that consumers may substitute taxed beverages with untaxed, lower-sugar options. This could be a positive outcome, but it also means that the tax revenue generated may be lower than expected, creating a budget gap for policymakers.
Furthermore, soda consumption has already been steadily declining, so enacting a tax may only result in a temporary spike in revenue before a decline as consumers continue to shift their spending habits. There are also concerns about the potential job losses in the soda industry and related sectors due to reduced sales and profit margins.
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Frequently asked questions
It depends on the jurisdiction. Some places, like Philadelphia, do tax diet drinks, while others, like California, do not.
The decision to omit artificially sweetened drinks from taxation depends on an assessment of the health effects of consuming those drinks. If sugary drinks present much greater health concerns than artificially sweetened drinks, then a health-focused tax should only apply to sugary drinks.
There is strong scientific evidence associating sugary drinks with higher rates of chronic diseases such as type 2 diabetes, heart disease, high blood pressure, liver disease, and dental disease.
While the evidence is weak at this stage, the potential for consumption of artificial sweeteners leading to adverse health effects cannot be ruled out. For example, aspartame has been classified as 'possibly carcinogenic to humans' by the International Agency for Research on Cancer (IARC).
A sugary drink tax is designed to reduce the consumption of sweetened beverages by making them more expensive to purchase. It is also intended to decrease obesity and the health impacts associated with being overweight, such as diabetes and heart disease.
