The Obesity Crisis - NHS Hot Topics For Medicine Interviews in 2026

As potential future doctors, it's crucial to understand the depth of the obesity epidemic in the UK, its causes and effects, and the measures to address it.

This may be a hot topic which comes up in your medical school interviews. This article will provide an in-depth look at obesity in the UK - current statistics, definitions, factors driving the rise, health complications and public health strategies.

Want to boost your revision and maximise your chances of receiving a UK medical school offer?

Combine your reading here with medicine interview tutoring or 1:1 mock interviews to enhance your answers and delivery.

Obesity in the UK Summary - What Do I Need To Know?

1. Obesity Definition - Obesity is defined as a Body Mass Index over 30.
2. Obesity Rate - Around 64% of adults in England are overweight or living with obesity, and roughly 26.5% are obese (Health Survey for England 2023-24).
3. Causes of Obesity - Obesity is caused by the interaction of social, environmental and genetic factors.
4. Effects of Obesity - Obesity reduces life expectancy by up to 10 years through inflammatory and destructive processes.
5. Public Health Measures - The government has implemented strategies to reduce obesity levels, including putting calories on menus, introducing a sugar tax and public health campaigns.

Obesity: Definition & Meaning

Obesity describes the abnormal or excessive fat level that presents as a health risk.

In the UK, Body Mass Index (BMI) is used to classify the level of obesity.

BMI is calculated by dividing the patient’s weight in kg by the patient’s height (in metres) squared.

You might be asked to calculate a patient’s BMI in your MMI interview as part of MMI calculation stations.

👉🏻 Read more: Ultimate Guide To MMI Calculations

UK Obesity Statistics: How Many People Are Obese in the UK?

How Much Does Obesity Cost the NHS in the UK?

This is one of the most common questions applicants are asked, so have a figure ready. Obesity and excess weight are estimated to cost the NHS in the region of £11 to £12 billion a year in treating related conditions such as type 2 diabetes, heart disease and several cancers. When you widen the lens to the whole economy, a 2025 analysis by Nesta and Frontier Economics put the total annual cost of obesity and overweight to society at around £126 billion, including roughly £31 billion in lost productivity.

In my GP clinics, very little of that cost is the headline drug bill. It is the slow accumulation of appointments, medications and complications across a patient's life. That framing matters in an interview: obesity is not one disease but a driver of many, which is exactly why it strains a system already trying to clear its backlog.

1. Obesity Rate - Around 26.5% of adults in England are classified as living with obesity (Health Survey for England 2023-24), with men and women affected at broadly similar rates.
2. Overweight or obese - In total, about 64% of adults in England are overweight or living with obesity, up from roughly 53% in the early 1990s.
3. Age-related Obesity - ¾ of 45 - 74-year-olds are overweight or obese
4. Childhood Obesity Rate - In 2024/25, 10.5% of Reception children (age 4-5) and 22.2% of Year 6 children (age 10-11) in England were living with obesity (National Child Measurement Programme).
5. Increasing Rates - Rates of obesity in both adults and children are increasing, and are predicted to continue to increase.

What Are the Causes of Obesity in the UK?

The increasing obesity rates in the UK stem from the interaction of behavioural, environmental and biological factors.

For your UK medical school interviews, you should be able to discuss a few of these factors:

Behavioural

• Increasing culture of fast, processed food intake
• Decreasing culture of fruit, fibre and vegetable intake
• Increase in sedentary lifestyles - desk jobs, longer working hours
• Increase in non-active hobbies - gaming, watching TV etc.

Environmental

• Increased access to motorised transports
• Increased availability of ultra-processed, high-calorie foods
• Increased labour-saving technology, reducing activity levels

Obesity follows a steep social gradient, and framing it purely as individual choice will usually get you challenged in an interview. Our guide to health inequalities and the Marmot Review explains the mechanism behind that gradient, including why the cheapest and most available food is so often the least healthy.

Biological

• Genetics
• Increasing incidence of hereditary conditions with a high risk of obesity e.g. Prader Willi Syndrome
• The cascading effect of obesity - 80% chance of the children of obese parents also becoming obese
• Increasing incidence of endocrine disorders which contribute to obesity e.g. PCOS

The interaction of these behavioural, environmental and biological drivers explains the considerable rise in obesity seen in the UK.

Could rising obesity rates be linked to the increase in mental health issues?

👉🏻 Read more: NHS Mental Health Crisis

Obesity: Summary of the Physiological Effects Of Obesity

Obesity is a multi-system disease, with its effects spanning almost all of the body systems.

For your UK medical school interviews, it’s important to be able to name a few of the effects of obesity on the body. Below we have provided a few examples:

• Inflammation and oxidative stress - this causes cellular damage and increases the risk of developing long-term health conditions like diabetes and Alzheimer’s.
• Insulin resistance - Obesity causes impaired glucose uptake in tissues, leading to the development of insulin resistance and type 2 diabetes.
• Hypertension - inflammation, hormonal dysfunction, compressed blood vessels, and dyslipidaemia interact to raise blood pressure in obese patients.
• Osteoarthritis - excess weight in obesity subjects joints and bones to increased mechanical stress which increases the risk of developing osteoarthritis.
• Overall reduced life expectancy

👉🏻 Read more: Common NHS Hot Topics

Childhood Obesity

The latest National Child Measurement Programme figures for 2024/25 show a mixed picture: Year 6 obesity has eased back from its pandemic peak but remains above pre-pandemic levels, while Reception obesity has risen again to 10.5% (up from 9.6% the previous year), the highest rate since the programme began in 2006-07 once the pandemic peak is excluded.

In 2024/25:

• 10.5% of Reception children (age 4-5) are living with obesity
• 22.2% of Year 6 children (age 10-11) are living with obesity, and the gap between the most and least deprived areas (29.3% versus 13.5%) has widened since the programme began

These statistics are unfortunately still higher than ideal.

How Are Childhood Obesity Rates Measured?

The National Child Measurement Programme began in 2006 and annually records the height and weight of children aged 4 - 5 and 10 - 11 years old in state schools in England.

This data is published yearly with analyses of BMI rates by age, sex, ethnicity and geography.

How Is the UK Tackling Obesity? Public Health Policy for the Medicine Interview

So what is the government doing to tackle the UK obesity crisis?

The Sugar Tax

Introduced in 2018, the Soft Drinks Industry Levy (the sugar tax) applies to UK-produced or imported sugary drinks above a sugar threshold. At the Autumn Budget 2025 the government announced it would strengthen the levy from 1 January 2028 by lowering the threshold from 5g to 4.5g of sugar per 100ml and, for the first time, bringing milk-based drinks into scope. Revenue was originally intended for childhood obesity prevention schemes, though in practice it has not been ring-fenced for that purpose.

Evidence shows that the sugar tax has been successful, with fewer childhood tooth extractions and obesity levels decreasing in the 10-11 year-old age group since its introduction.

For a deeper dive into how the levy works, the evidence behind it and how to discuss it ethically, see our dedicated guide to the sugar tax as an NHS hot topic.

A Medical Research Council study found the tax may have prevented over 5,000 cases of obesity annually in year 6 girls alone, an 8% reduction compared to expected trends.

Notably, this benefit was strongest in girls from deprived households, highlighting the tax's potential to combat health inequalities.

However, no significant impact was seen on boys or younger children; overall sugar consumption across the UK rose slightly in 2023.

This underscores the need for a broader approach, including promoting healthier diets and exercise.

NHS Better Health Campaign

The NHS Better Health Campaign was developed during the lockdown to tackle the rising obesity rates, following the link between obesity and hospitalisation from COVID-19 being highlighted.

The campaign encourages healthy, evidence-based weight loss techniques using resources such as the free NHS Weight Loss Plan app.

This is especially important with the ageing population in the UK which is therefore likely to suffer from increased metabolic and obesity-related issues in the future, which will have a significant impact on the NHS, especially whilst we try to clear the current backlog in the NHS.

The campaign has contracts organised with nutritional and weight management companies to provide free or discounted resources and software to help patients lose weight.

👉🏻 Read more: MMI Prioritisation Tasks

Calorie Labelling

Weight-Loss Injections on the NHS

The newest, and most heavily examined, development is the arrival of GLP-1 weight-loss medicines. From 23 June 2025, tirzepatide (brand name Mounjaro) began to be made available for weight management through GP practices in England, following NICE approval. Because demand vastly outstrips capacity, the rollout is phased over several years: those with the highest clinical need are prioritised first, broadly people with a BMI of at least 40 plus weight-related health conditions, alongside wraparound diet and lifestyle support.

This is fertile ground for ethical interview questions about fairness, cost-effectiveness and whether medication risks letting the obesogenic environment off the hook. We cover the arguments in detail in our guide to the ethics of NHS weight-loss injections.

In April 2022, the government introduced regulations requiring calorie information on menus in large food businesses (those with 250 or more employees). This means calorie information is no longer just available but hard to avoid. More recently, attention has shifted to the high in fat, salt and sugar (HFSS) advertising restrictions: a 9pm television watershed for less healthy food and drink, plus a total ban on paid-for HFSS advertising online, which became legally enforceable on 5 January 2026 (with many broadcasters and advertisers complying voluntarily from October 2025).

This policy, driven by concerns about rising obesity rates, aims to empower consumers with calorie awareness and nudge them towards healthier choices.

This policy was met with resistance and anger by eating disorder charities and parts of the general public, voicing that it encouraged unhealthy calorie counting and relationships with food.

Eating disorder charities and some citizens voice concerns about the potential harm, particularly for vulnerable individuals prone to unhealthy fixations on calorie numbers.

Studies published in 2023 by King's College London support these anxieties, suggesting a potential rise in disordered eating behaviours among young women exposed to calorie labelling.

However, overall takeaway and restaurant food purchases saw a modest increase, indicating that calorie information alone may not be enough to drive significant dietary shifts.

👉🏻 Read more: NHS Core Values 2024

Obesity Example Interview Questions and Answers

What do you think are the ethical considerations regarding adding calorie information to menus in UK restaurants?

There are some ethical arguments and considerations both for and against adding calorie information to menus in the UK.

On the one hand, displaying calorie information could help consumers make more informed choices and potentially reduce overconsumption and obesity rates. From an ethical standpoint, consumers have a right to know nutritional information that can impact their health. Restaurants must be transparent about serving sizes and calorie content.

However, there are also ethical concerns regarding calorie labelling. Detailing calorie counts could exacerbate disordered eating in vulnerable populations like those suffering from anorexia or bulimia nervosa. It places the burden entirely on consumers without requiring restaurants themselves to offer sufficient healthy options.

Overall, I think calorie labelling does have the potential to improve public health mildly. But it should not be the only approach. A more comprehensive strategy should include restaurants offering nutrition-focused menu items, advertising regulations, and public health campaigns to promote balanced diets and lifestyles.

👉🏻 Read more: Answering Medical Ethics Questions

How would you solve the obesity crisis in the UK? What are potential solutions to the obesity epidemic?

If I were addressing the obesity crisis in the UK, my approach would involve a mix of practical solutions and ethical considerations.

Firstly, it's essential to promote healthier lifestyles, focusing on the benefits of a balanced diet and regular exercise. However, this must be done respectfully, without stigmatising individuals struggling with obesity.

I believe in empowering people through positive messaging. It's about encouraging healthier choices while upholding the principles of respect and non-maleficence, ensuring that our interventions do no harm and maintain individual dignity.

When it comes to policy implementation, like taxes on unhealthy foods or restrictions on advertising, balancing public health goals with individual freedoms is crucial.

These policies should aim to benefit public health broadly but must be made to avoid unfairly burdening lower-income groups in the UK.

This approach aligns with the ethical principle of justice, ensuring fairness and equity in health interventions.

I think more can be done to promote physical activities through urban planning and community initiatives, I'd emphasise accessibility and inclusivity.

It's not just about creating opportunities for physical activity but ensuring these opportunities are available to everyone, regardless of their socioeconomic status.

In summary, whilst I can go on, ethically addressing the obesity crisis requires a sensitive, inclusive approach that respects the rights and dignity of all individuals across the UK.

👉🏻 Read more: Good Medical Practice 2024 Changes

More Obesity Interview Questions For Your Practice For Interview Preparation

1. Discuss the main causes of the high rates of obesity in the UK population.
2. How might the obesity crisis place a strain on the NHS?
3. From a public health perspective, what types of interventions do you think would help tackle the obesity crisis in the UK?
4. As a doctor, how would you sensitively broach the topic of weight management with an obese patient?
5. Childhood obesity rates have risen sharply in the UK in recent years. Why do you think this is?
6. Should patients with obesity be treated on the NHS?
7. How could conscious or unconscious biases about obesity affect patients and healthcare in the NHS?
8. Name a public health measure or policy change in the last 15 years aimed to tackle obesity in the UK.

👉🏻 Read more: More Medical School Practice Interview Questions

Obesity in 2025/26: The Latest Data and GLP-1 Weight-Loss Medicines

If you are preparing for interviews in the 2025/26 cycle, examiners will expect you to be current. The most recent measured figures (Health Survey for England 2023-24) put adult obesity at 26.5%, with 64.5% of adults either overweight or living with obesity. The 2024/25 National Child Measurement Programme, published in November 2025, showed 10.5% of Reception children and 22.2% of Year 6 children living with obesity - Reception obesity is now at one of its highest levels since the programme began, and the deprivation gap remains stark: obesity is roughly twice as common in the most deprived areas (29.3% of Year 6 in the most deprived areas versus 13.5% in the least). In my experience, quoting the deprivation gradient rather than just the headline rate is what makes an answer stand out.

On cost, the widely cited Frontier Economics work estimates obesity and excess weight cost the NHS around £11 billion a year, with the total cost to society (lost productivity, informal care and reduced quality of life included) running much higher. Whichever figure you use, attribute it and be ready to explain that most of the burden is indirect - the diabetes, heart disease, joint problems and cancers that accumulate over years rather than a single line on a budget.

The biggest recent development is the arrival of GLP-1 medicines in NHS primary care. From 23 June 2025, tirzepatide (Mounjaro) began being offered through GP practices in England after NICE approval, in a phased rollout expected to run over around three years and prioritising patients with the greatest clinical need first. These drugs are examined heavily, but this article is about the obesity crisis and how to frame it - for the detail on the medicines themselves, the evidence, the cost-effectiveness debate and the ethics of who gets them first, read our dedicated guide to weight-loss injections as a medical school interview topic. A strong candidate links the two: injections treat individuals, but without also changing the obesogenic environment we are treating the symptom, not the cause.

The other 2025/26 change worth knowing is that the HFSS (high in fat, salt and sugar) advertising restrictions became legally enforceable on 5 January 2026 - a 9pm television watershed and a total ban on paid-for junk-food advertising online. The government projects it could remove billions of calories from children's diets each year. As always, please double-check the latest headline figures on gov.uk or NHS England Digital before your interview, as these statistics are updated annually.

How to Structure an Obesity Answer in Your Medicine Interview

Knowing the facts is only half the task; interviewers are really assessing how you think. When obesity comes up, avoid reciting statistics like a textbook. A structure I coach students to use is: scale, causes, response, ethics.

1. Scale: open with one or two well-chosen figures (roughly a quarter of adults obese, nearly two-thirds above a healthy weight, and the deprivation gradient) to show you understand this is a population-level problem, not just a personal one.
2. Causes: reach for the obesogenic environment. Framing obesity as the product of cheap ultra-processed food, sedentary work and biology - rather than willpower - signals maturity and compassion.
3. Response: show you know that prevention (sugar tax, HFSS ad ban, calorie labelling) and treatment (GLP-1 medicines, bariatric surgery) both matter, and that neither alone solves it.
4. Ethics: finish on the tension between public health and personal autonomy, and on fairness - who bears the cost of levies, and who gets scarce weight-loss medicines first. Weaving in the four pillars (autonomy, beneficence, non-maleficence and justice) shows the examiner you can reason, not just recall.

One more point that consistently impresses: if you are asked how you would raise weight with a patient, describe person-first, non-stigmatising language and asking permission before discussing it. As a GP, I see how quickly a clumsy conversation about weight can damage trust - showing you have thought about that human side is often what separates a good answer from a great one.

Related NHS hot topics for your medicine interview

Strong interview answers connect the dots between current affairs. For the bigger picture, see our hub on NHS hot topics and wider reading for MMI interviews, then read these closely related guides:

• NHS Weight-Loss Injections (Ozempic, Wegovy & Mounjaro)
• The Sugar Tax & Soft Drinks Industry Levy
• The Mental Health Crisis in the UK