The sugar tax is one of the most common public health questions at medical school interviews, usually asked as "discuss the pros and cons" and sometimes followed by "what else could be done?". It is a good question for interviewers because it has real evidence on both sides, it links obesity, inequality and government intervention in one topic, and it shows quickly whether an applicant can argue a policy question without just picking a side. This article goes through why schools ask it, how to structure a balanced answer, and an example of a strong one.
Discuss the pros and cons of a sugar tax.
- If a sugar tax is not used, what else could be done to address the issues it aims to tackle?
Why medical schools ask it
You don't need in-depth knowledge of NHS policy at interview. Interviewers want awareness and basic understanding, and a brief, reasoned answer. Policy questions like the sugar tax test whether you can build that answer: name the relevant themes, give two or three points under each, and reach a balanced conclusion. They also test whether you see the ethical dimension, because any public health measure is a trade between autonomy on one side and beneficence and justice on the other.
The sugar tax in particular has become a standard example because the UK actually did it. The Soft Drinks Industry Levy came into force in April 2018, charging manufacturers per litre of drinks above a sugar threshold, and the main effect was reformulation: most big brands cut sugar to get under the threshold before the tax even started, so sugar sold in soft drinks fell sharply while sales did not. Knowing that one fact separates an applicant who has read about the topic from one who is guessing.
What interviewers are looking for
Across NHS and topical questions, interviewers mark for:
- A definition. What the tax is and what it is trying to achieve: reduce sugar intake, push manufacturers to reformulate, and lower rates of obesity, diabetes and tooth decay.
- Genuine arguments on both sides, two or three each, rather than a list of pros with one token con.
- Awareness of equity. The regressive effect on lower-income households is the con that interviewers most want to hear, and the answer to it (pair the tax with affordable healthy alternatives) is the point they most want to hear next.
- A conclusion. Your own view, with the reason, and an acknowledgement that the tax is one measure among several.
How to structure your answer
The general approach for most NHS and topical questions is to state three or four first-level themes, break each into two or three points, and reflect. The model answer below does the pros and cons first, then uses the same method for the second part of the question, what to do instead:
Part 1: Pros and cons of a sugar tax
1. Define the sugar tax
A sugar tax aims to reduce sugar intake, encourage industry changes, and lower rates of obesity, diabetes, and other health conditions.
2. Pros of a sugar tax
3. Cons of a sugar tax
Part 2: Alternatives to a sugar tax
Approach
1. First-level buckets
2. Approach each bucket with insight
A. Product and pricing
B. Marketing and labelling
C. Access and affordability of healthy options
D. Education, healthcare, and community support
Reflection on options
Example answer
A spoken answer to the pros and cons, about ninety seconds:
- Define
- A sugar tax puts a charge on high-sugar products, usually drinks, to cut how much sugar people consume and to push manufacturers to take sugar out. The UK has had one since 2018, the Soft Drinks Industry Levy, charged on manufacturers per litre above a sugar threshold.
- Pros
- The strongest argument for it is that it worked in a way nobody quite expected: most manufacturers reformulated to get under the threshold before the tax started, so the sugar in soft drinks fell a lot without people having to change what they bought. Higher prices also reduce consumption most among the groups who drink the most, which is children and teenagers. The money raised can be ring-fenced for school sport and breakfast clubs. And a tax sends a signal that high sugar is a health risk, which shifts norms over time.
- Cons
- Against it, the cost falls hardest on lower-income households, who spend a bigger share of their income on food and drink, so on its own it is regressive. People can substitute, switching to untaxed sugary snacks or to alcohol. And it only covers drinks, when a lot of sugar comes from food, so it cannot be the whole answer.
- Conclusion
- On balance I think it is justified, mainly because of the reformulation effect, but it should be paired with measures that make healthy options cheaper rather than only making unhealthy ones dearer, so that the people it bears on hardest also get the benefit.
Practise this question out loud
Try answering it with the AI interviewer: it asks the question, follows up on what you say, and marks you against the points above.
Common follow-up questions
The sugar tax sits inside the wider obesity debate, and the follow-ups move there: what else the government should do, whether intervention is ethical at all, and whether the NHS should treat conditions it sees as self-inflicted.
If a sugar tax is not used, what else could be done?
The second part of the Birmingham station. Four buckets: product and pricing, marketing and labelling, access to healthy options, and education and healthcare. Two or three points under each.
What should the government do to tackle obesity, and what are the ethical issues with intervening?
Asked at Birmingham. Education, regulation, access and healthcare on one side; autonomy, stigma and economic cost on the other.
Should selling sugary snacks and drinks be banned in hospitals?
Asked at Hull York. A proportionate policy (healthy defaults, sugar thresholds, clinical exemptions, affordable options 24/7) beats an outright ban.
Why should bariatric surgery be funded by the NHS when obesity is often viewed as self-inflicted?
Reported at Bristol, Imperial and Southampton. The NHS does not ration by blame; the same logic would deny care for smoking, sport injuries and most of medicine.
Discuss two arguments for and two against the NHS providing a hip operation to an obese patient.
Reported at Liverpool and Manchester. Justice and best value against beneficence and the clinical risk of operating.
Common pitfalls
Things to avoid when answering the question:
- One-sided answers :
- Three pros and "some people say it's unfair" is not a discussion. Give the cons the same weight.
- Not knowing the UK has one :
- The Soft Drinks Industry Levy has been in force since 2018. Treating the sugar tax as hypothetical suggests you have not read about it.
- Missing the equity point :
- The regressive effect is the central objection. If you do not raise it, the interviewer will.
- Sitting on the fence :
- After both sides, say what you think and why. "It depends" is not a conclusion.
- Treating it as the whole solution :
- It covers drinks only. The best answers say what sits alongside it.
- Moralising about individuals :
- Obesity is strongly linked to deprivation. Answers that frame it as personal weakness lose the justice marks and the compassion ones.
Which schools ask it
The two-part sugar tax station is reported at Birmingham, which also asks the broader obesity question. The related questions above are reported at Hull York, Bristol, Imperial, Southampton, Liverpool and Manchester.
Reported at Birmingham.
Frequently asked questions
What is the UK sugar tax?
The Soft Drinks Industry Levy, introduced in April 2018. Manufacturers pay per litre on drinks with more than 5g of sugar per 100ml, with a higher rate above 8g. Pure fruit juice and milk-based drinks were exempt at launch.
Did the sugar tax work?
Partly, and not in the way expected. The total sugar sold in soft drinks fell by about a third, almost all through reformulation rather than people buying less. Studies have linked it to fewer hospital admissions for tooth extraction in children. Its effect on obesity rates is harder to show, because drinks are only one source of sugar.
Is the sugar tax regressive?
In price terms, yes: lower-income households spend a larger share of income on the taxed products. The counter-argument is that those households also carry more of the disease burden, so they gain most from reduced sugar intake, and that the revenue can be spent on them. A good answer gives both halves.