IB Psychology SLTopic 2 — Health ProblemsPaper 1 & 2Sociocultural approach~9 min read
Why Obesity Rates Differ Between Cultures
Nobody eats in a vacuum. What lands on your plate, how much of it there is, who you eat it with and whether you would ever refuse a second helping are all decided long before you get hungry. This page is about how culture sets those defaults.
📚 What you need to know
Hofstede surveyed over 60,000 IBM employees in 50+ countries (1971–1973) using questionnaires on cultural attitudes.
The dimension you need is individualism vs collectivism.
Individualistic cultures may treat eating habits as personal choice, even against health advice.
Collectivist food choices reflect group norms — shared meals and traditional foods.
Group norms can build cohesion and reinforce unhealthy habits. They cut both ways.
Obesity prevalence here is measured with BMI, with all the flaws that carries.
Masood et al. (2019) is the study: 156,192 adults from 53 countries.
The two pathways
Individualistic cultures focus on “I/me” and value independence, competition and personal achievement. Members enjoy freedom and choice, but risk isolation and lack of support. Collectivist cultures focus on family, colleagues and community, and value interdependence, cooperation and group harmony. Members enjoy belonging, but may feel reduced personal identity and autonomy.
Applied to food, those two starting points lead somewhere quite different.
The right-hand fork is the part worth writing about. A group norm is only healthy if the tradition it protects happens to be a healthy one — and the same social pressure that protects it will also defend an unhealthy one.
Individualistic cultures
People may view their behaviour, including eating habits, as a personal choice even when it goes against health advice. That can contribute to higher obesity prevalence, because convenience or preference gets prioritised over group or health norms. There is nobody to answer to.
Collectivist cultures
Food choices reflect group norms — shared meals, traditional foods. This encourages cohesion, but it can also reinforce unhealthy habits. Obesity may be shaped by group expectations, with individuals less likely to go against family or cultural eating traditions. Refusing a third helping at a family meal is not a nutritional decision in that context. It is a social one.
Use that last sentence idea in an essay. The mechanism is not really about food at all — it is about the cost of breaking a norm. In an individualistic culture the cost of eating differently is near zero, so nothing stops you either way. In a collectivist culture the cost is high, so the norm holds firmly in whichever direction it happens to point.
🔬 Masood et al. (2019)
Culture and BMI on a very large scale
AIM
To investigate the relationship between individualism versus collectivism and BMI.
PARTICIPANTS
156,192 adults from 53 countries, representing both individualistic and collectivist cultures.
PROCEDURE
Data was collected on each participant’s BMI, gender, age, marital status, education, occupation, socioeconomic status and rural or urban location.
RESULTS
Participants from individualistic countries such as the USA had higher BMI on average than those from collectivist cultures such as Vietnam.
CONCLUSION
National culture has a significant relationship with BMI, which helps explain cross-cultural patterns of obesity prevalence.
Look at the variables list. Masood collected socioeconomic status, education and rural or urban location alongside culture. That is deliberate — those are the obvious rival explanations, and collecting them is what lets the researchers argue that culture is doing work of its own. Naming that shows you understand why a study measures things it is not directly studying.
Evaluating cultural dimensions and obesity
Strengths
Limitations
Masood obtained a huge sample, so the results are robust enough to withstand statistical testing.
BMI is simplistic — it does not capture deeper cultural attitudes toward food, body image or obesity.
High external validity means findings are generalisable across cultures.
Replication on this scale would be difficult because of the time and cost involved.
A standardised BMI measure increases reliability and makes the research easier to replicate in principle.
Hofstede’s dimensions may be reductionist, forcing complex cultural behaviour into rigid categories.
Hofstede’s large global survey gives extensive quantitative data and is regularly reviewed, reducing temporal validity problems.
Sample bias in Hofstede: IBM employees were not equally representative, with more from the USA and developed countries.
Linking to the concepts
Responsibility: obesity research is socially sensitive and the results could be used to stereotype or discriminate against specific social or cultural groups. Findings in this field should be reported carefully, with researcher reflexivity as a priority.
Change: prevalence may shift with continuing globalisation. As access to fast, processed food increases, obesity rates are rising in collectivist countries such as India, where traditionally there was no real obesity problem.
That last point is quietly devastating for a simple version of the theory. If a country’s culture stays collectivist while its obesity rate climbs, then culture cannot be the whole story — the food environment changed, not the values.
EXAM ANSWER
Discuss one cultural dimension in relation to one health problem. [22 marks]
Set up the dimension with its evidence base
Hofstede’s individualism–collectivism, from over 60,000 IBM employees in 50+ countries.
Two mechanisms, not one
Individualism frames eating as personal choice so convenience wins. Collectivism binds eating to group norms, which can protect or entrench.
Evidence
Masood et al.: 156,192 adults, 53 countries; higher average BMI in individualistic countries.
Counter-argument that actually bites
Rising obesity in India shows a collectivist culture with a climbing rate, so the food environment may matter more than values.
Conclude: culture shapes the risk, globalisation is reshaping it nowusing change over time as your counter-argument feels much fresher than “correlation not causation”
💡 Exam tips
Explain the mechanism through norms, not through willpower. That is the sociocultural level of analysis.
Present collectivism as double-edged. Most candidates only argue one direction.
Reuse the BMI criticism from the prevalence page — it applies here too.
Name Hofstede’s dates (1971–1973) and then question whether findings from then still describe now.
The India example is a ready-made “change” paragraph. Learn it as one sentence.
This structure is nearly identical to the smoking page that follows, so learn one shape and adapt it.
⚠ Common mix-ups
Saying collectivist cultures are healthier. The evidence says lower average BMI in this research, which is a narrower claim.
Treating a country as one culture. Every country contains many, and Masood recorded rural and urban separately for exactly that reason.
Calling Masood an experiment. No variable was manipulated; it is correlational.
Forgetting BMI’s flaws once you leave the prevalence page. Every figure here rests on it.
Using judgemental language about either culture. Describe patterns, not virtues.
Mixing Hofstede up with Masood. Hofstede supplied the framework; Masood tested it against BMI.
Up next: Why Smoking Rates Differ Between Cultures — the same framework applied to a different behaviour, and it produces a result that flatly contradicts what you would predict from this page.
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