Key Idea: Topic 12.1 is about how we measure food and health, and how both vary from place to place. It pulls together two ideas: 12.1.1 — measuring food and nutrition: food consumption (kcal/person/day) and diet quality; malnutrition covering both undernutrition and over-nutrition; and the indices that compare places — the food security index (affordability, availability, quality & safety) and the undernourishment rate. 12.1.2 — measuring health and disease: the health indicators (life expectancy, infant + maternal mortality, morbidity) that gauge a population's health, and how the pattern of disease shifts from infectious diseases of poverty towards chronic diseases of affluence as countries develop (the epidemiological transition). This is Option F (The geography of food and health), examined on Paper 1 — SL answers two options, HL three (same questions). Each option = a short data-response off a figure (a table, bar chart or choropleth map), a structured Outline/Suggest/Explain, and a [10] Examine extended answer.
🍽️ 12.1.1 — Measuring food and nutrition
Food consumption is measured by how much food people take in — usually the average daily calorie supply per person (kcal/day). Nutrition is about the quality of that diet, not just the amount. Malnutrition is the umbrella term: it covers undernutrition (too little food or too few nutrients) and over-nutrition (too much energy or an unbalanced diet) — so richer regions are not automatically well nourished. The skill examiners test is reading a table or bar chart of food supply and undernourishment by region (or a food-security score), then outlining a component or a human factor and backing it with a figure and its units.
Comparing food and nutrition between places
| Measure | What it captures | Pattern with development |
|---|---|---|
| Calorie supply (kcal/person/day) | How much food energy is available per person | Higher in richer regions |
| Undernourishment rate (%) | Share not getting enough calories to be healthy | Falls as a country develops |
| Food security index | Affordability + availability + quality & safety | Stronger in higher-income places |
| Over-nutrition (obesity) | Too much energy / unbalanced diet | Rises with affluence (nutrition transition) |
Key terms — food and nutrition
- Food consumption — the amount of food eaten, often measured as kcal per person per day.
- Malnutrition — the umbrella term covering both undernutrition and over-nutrition.
- Undernutrition / over-nutrition — too little food/nutrients vs too much energy or an unbalanced diet.
- Undernourishment rate — the % of a population not getting enough calories to be healthy.
- Food security index — three pillars: affordability, availability, quality & safety.
- Nutrition transition — as affluence rises, diets shift from staples to meat, dairy, sugar and processed food.
Tip: An Outline of the food security index wants the component AND what it measures. Affordability — whether people can afford to buy enough food. Name it, then say what it captures. On a table or bar chart, describe the pattern in words, then quote a figure with its unit (e.g. 2,300 kcal and 23% undernourished in sub-Saharan Africa vs 3,800 kcal and under 2.5% in North America).
🩺 12.1.2 — Measuring health and disease patterns
Health indicators are the numbers that measure how healthy a population is and let us compare places: life expectancy, infant and maternal mortality, morbidity (the amount of disease) and calorie intake. They vary with development — poorer places carry a heavier burden of infectious diseases of poverty (malaria, cholera, TB), while richer places see rising chronic diseases of affluence (obesity, type-2 diabetes, heart disease). The classic stimulus is a choropleth world map of a health indicator. The data-response asks you to identify the region in the highest band, read off a band for one place, or estimate a percentage change — always reading the key first, never inventing an exact figure.
Read the key first. Which region is shaded darkest (the highest band)? For a % change, do (new - old) / old x 100.
🔒 Interactive diagram
Explore the labelled diagram, charts and maps for this topic in study mode.
Diseases of poverty vs diseases of affluence
| Feature | Diseases of poverty | Diseases of affluence |
|---|---|---|
| Type | Mostly infectious | Mostly chronic / lifestyle |
| Linked to | Poverty, poor water, under-nutrition | Wealth, diet, sedentary lifestyle |
| Examples | Malaria, cholera, TB | Obesity, type-2 diabetes, heart disease |
| Trend with development | Falls as a country develops | Rises as a country develops |
Key terms — health and disease
- Life expectancy — the average years a newborn is expected to live; rises with development.
- Infant / maternal mortality — under-1 deaths per 1,000, and mother deaths per 100,000, live births.
- Morbidity — the amount or rate of disease (illness, not death) in a population.
- Disease of poverty — an infectious disease tied to deprivation (malaria, cholera, TB).
- Disease of affluence — a chronic / lifestyle disease tied to wealth (obesity, type-2 diabetes).
- Epidemiological transition — the shift from diseases of poverty to diseases of affluence as a country develops.
Whether you Suggest or Explain, don't just name a reason — show how it changes health. Rising wealth → energy-dense diet → excess calories → obesity → type-2 diabetes. A figure or named example (US obesity, the Middle East diabetes surge) lifts the answer into the top band. Population growth alone is not a credited reason for rising disease.
✍️ IB-style questions
Explain two reasons why rates of diseases of affluence tend to rise as a country becomes wealthier.
🔒 Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
Examine the view that differences in food consumption between places are the main reason for differences in life expectancy.
🔒 Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
✅ Quick self-check
Tap each card to reveal the answer.
What are the three pillars of the food security index? Affordability (can people afford food?), availability (is enough supplied?) and quality and safety (is the food nutritious and safe?).
Why is malnutrition not just hunger? It is the umbrella term for both undernutrition (too little food/nutrients) and over-nutrition (too much energy or an unbalanced diet) — so high-income regions can be malnourished too, via obesity and diet-related disease.
Disease of poverty vs disease of affluence? Poverty diseases are infectious and tied to deprivation (malaria, cholera, TB). Affluence diseases are chronic / lifestyle and rise with wealth (obesity, type-2 diabetes, heart disease).
What is the epidemiological transition? The shift in a country's disease pattern from infectious diseases of poverty towards chronic diseases of affluence as it develops — driven by richer diets, sedentary lifestyles and longer lives.
How do you read a value off a choropleth map? Take the band from the key the area is shaded with — not a made-up exact figure. For a percentage change, do (new − old) / old × 100.
🎯 Highest-yield exam reminders
Exam Tips
- Food consumption = kcal/person/day; malnutrition covers BOTH undernutrition AND over-nutrition.
- Food security index = affordability + availability + quality & safety. Outline a component = name it + what it measures.
- Reading a figure (table, bar chart or choropleth): quote the band/value WITH its units; for a % change do (new − old) / old × 100.
- Diseases of poverty = infectious (malaria, cholera, TB); diseases of affluence = chronic (obesity, type-2 diabetes) — they swap over with the epidemiological transition.
- Suggest/Explain: give the MECHANISM through to a health outcome and a named example; population growth alone is not credited.
- On Paper 1, the [10] Examine essay needs both sides developed (food AND non-food causes; under- AND over-nutrition), named examples with data, and a clear judgement.