Chapter 36 — Self-Check Quiz

20 questions. Answers with explanations at the end. Aim for 16+.

⚠️ This quiz closes Part VI. Questions 12, 15 and 20 are the ones Part VII depends on.

Questions

1. The cheapest calories in a shop are refined grain, oil, sugar and starch because:

• a) Consumers demanded them
• b) Agricultural support concentrated on storable commodities, processing is where the margin is, shelf life is a logistics problem processing solves, and scale compounds all three
• c) They are the most nutritious to produce
• d) Of a deliberate conspiracy

2. Removing agricultural subsidies would:

• a) Make lentils competitive with biscuits at the till
• b) Have modest effects on retail prices — the raw commodity is a small fraction of a processed product's price
• c) Have no effect at any point in the chain
• d) Immediately raise fruit and vegetable consumption

3. The best-established finding in environmental food accounting is:

• a) Local food has a lower footprint
• b) Ruminant meat has substantially higher impact per unit protein or calorie than plant sources, and the ordering is robust to methodological choices
• c) Packaging dominates food's footprint
• d) Organic farming is always lower impact

4. Within-category variation between producers:

• a) Is negligible
• b) Is large — but the highest-impact plant producers are still typically lower-impact than the lowest-impact beef producers
• c) Means what you eat doesn't matter, only how it was produced
• d) Has never been measured

5. "Buying local substantially reduces your dietary footprint" is:

• a) ✅ Well supported
• b) 🟡 Unclear and usually overstated — transport is typically a small share; production dominates
• c) ❌ Not supported in any sense
• d) 🟢 Probably true

6. Per calorie, salad appears to have a high footprint because:

• a) It is grown badly
• b) It has almost no calories to divide by — an arithmetic artefact of the denominator
• c) It requires refrigeration
• d) It is usually imported

7. The practical rule for reading any environmental food comparison is:

• a) Trust the source
• b) Find the denominator before you read the ranking — if it isn't stated, the ranking is not information
• c) Prefer per-kilogram comparisons
• d) Prefer per-protein comparisons

8. Ultra-processed food is abundant primarily because:

• a) Consumers demanded it first
• b) It solves every problem a food business has — margin, shelf life, supply volatility, differentiation, repeat purchase, distribution and growth
• c) It is nutritionally superior
• d) Governments mandated it

9. Reformulation:

• a) Solves the problem Chapter 22 identified
• b) Genuinely works for the targeted nutrient AND does not address Chapter 22's finding — a reformulated Group 4 product is still Group 4
• c) Has never been achieved
• d) Only works voluntarily

10. In most high-income countries, what a shopper sees on the shelf is decided mainly by:

• a) Consumer demand alone
• b) A small number of retail chains and their buyers — with eye-level position frequently a purchased asset
• c) Government regulation
• d) Manufacturers alone

11. Marketing's effect on children's food preferences and consumption is:

• a) 🟡 Unclear
• b) ✅ Well supported and not seriously contested — and the marketing is overwhelmingly for Group 4 products
• c) ❌ Not supported
• d) 🟠 Probably false

12. The organizing principle of §36.7's intervention ladder is:

• a) Cheaper interventions work better
• b) Interventions that change the DEFAULT outperform interventions that require a decision
• c) Voluntary approaches outperform mandatory ones
• d) Local interventions outperform national ones

13. The weakest tier on that ladder, and the most often funded, is:

• a) Taxes
• b) Consumer education campaigns alone — because they require nothing of anybody except the individual
• c) Reformulation targets
• d) School food standards

14. Food waste in higher-income countries concentrates:

• a) At harvest
• b) Downstream — in retail and above all households
• c) In transport
• d) In processing

15. When the environmentally optimal and the nutritionally optimal diets are compared, they:

• a) Diverge sharply
• b) Converge substantially — less ruminant meat, more pulses, whole grains, vegetables, nuts, less waste
• c) Are unrelated
• d) Cannot be compared

16. Genuine divergences between the two include:

• a) Vegetables and whole grains
• b) Fish, sugar, and the needs of specific populations
• c) There are none
• d) All animal products

17. "Individual choices don't matter, only systems do" is:

• a) Entirely true
• b) Half right — the scale mismatch and responsibility-shifting are real, AND aggregate demand is what the system responds to, and the claim is frequently used to avoid easy changes
• c) Entirely false
• d) Untestable

18. The two highest-effect individual actions are:

• a) Buying local and choosing better packaging
• b) Reducing ruminant meat, and wasting less
• c) Buying organic and avoiding additives
• d) Eating seasonally and buying carbon-neutral labels

19. The historical record of successful food-system change shows that:

• a) Education campaigns drove the changes
• b) The changes that worked were structural — default changes, reformulation, price signals — and took decades against consistent opposition arguments
• c) Change happens quickly once evidence exists
• d) Industry cooperated voluntarily throughout

20. Part VI's 🧾 blocks have costed, in order:

• a) The same thing five times
• b) Opportunity, floors, delay, products, and externalities — and the price on the shelf is the smallest number of the five
• c) Only food prices
• d) Only environmental costs

Answers

1. b) Four mechanisms. ⚠️ Support concentrated on storable commodities for sound historical reasons — you cannot stockpile spinach — and the unintended consequence is that the inputs to ultra-processed food are the ones made most abundant and price-stable. §36.2.

2. b) Modest effects. ⚠️ The wheat in a box of cereal costs a few cents; processing, packaging, marketing, transport and margin are the rest. ⚠️ The subsidy story is real, upstream, and not a lever you can pull at the till. §36.2.

3. b) Ruminants highest, ordering robust. ⚠️ Life-cycle assessments across thousands of farms and dozens of countries converge on the same ordering across greenhouse gases, land, water and eutrophication. §36.3.

4. b) Large, but it doesn't close the category gap. ⚠️ Which means WHAT you eat matters more than HOW it was produced, for the highest-impact categories. §36.3.

5. b) 🟡 Usually overstated. ⚠️ Local has other genuine arguments — seasonality, economy, freshness — and greenhouse gases is a weak one. ⚠️ Air freight is the real narrow exception (🟢). §36.3.

6. b) An arithmetic artefact. ⚠️ The unit is a hidden claim about what the food is FOR. Per-calorie assumes the food's job is energy; per-protein assumes it is protein; per-kilogram assumes it is bulk. ⚠️ None is neutral. §36.3b.

7. b) Find the denominator first. ⚠️ The ✅ claims — ruminants highest, pulses lowest — hold under EVERY unit, which is what makes them robust. The 🟡 claims are 🟡 because the answer moves when you change the denominator. §36.3b.

8. b) It solves every business problem. ⚠️ Which reframes Chapter 22: these products are abundant because they are what a food system organized this way is best at producing — and demand was then cultivated, competently and legally. §36.5.

9. b) Works for the nutrient; doesn't address Chapter 22. ⚠️ Both halves. The near-elimination of industrial trans fat is one of the clearest public health successes in this book, and a reformulated Group 4 product is still Group 4. §36.5, and Case Study 1.

10. b) Retail chains and their buyers. ⚠️ A product not listed by the major chains is, for most of the population, a product that does not exist — and eye-level position is frequently a purchased asset rather than a signal of anything. §36.5b.

11. b) ✅ Well supported. ⚠️ Not seriously contested in the research literature. ⚠️ What is 🟡 is whether restricting broadcast advertising changes population diet, given displacement to unregulated digital channels. §36.6.

12. b) Defaults beat decisions. ⚠️ Which is Chapter 33 §33.4's finding arriving at population scale from a completely different direction — and it is the single most useful sentence in the chapter. §36.7.

13. b) Education alone. ⚠️ The weakest tier and the most funded, because it is the one that requires nothing of anybody except the individual. ⚠️ Case Study 1's Intervention A, and the distributional finding: it works best on the people who needed it least. §36.7.

14. b) Downstream, in households. ⚠️ Upstream in lower-income countries — a cold chain and capital problem. ⚠️ Which means "reduce food waste" is two entirely different interventions depending on where you are. §36.8.

15. b) They converge substantially. ⚠️ This is the SECOND CONVERGENCE. ⚠️ Chapter 35 found that sophisticated individual personalization converges on conventional advice; this chapter finds an entirely independent planetary analysis converging on approximately the same pattern. §36.9.

16. b) Fish, sugar, specific populations. ⚠️ Oily fish is nutritionally well supported and many fisheries are not sustainable; sugar has a modest footprint and is what this book has been most negative about; and an environmental optimum does not serve an iron-deficient adolescent or an undernourished patient. ⚠️ Nameable, which is different from embarrassing. §36.9.

17. b) Half right. ⚠️ The scale mismatch is real, and emphasizing individual footprints has been a deliberate strategy that moves the argument from regulation to personal virtue — Chapter 32 §32.11's "transfers the blame, not the resources," at planetary scale. ⚠️ AND aggregate demand is what the system responds to, and the two were never alternatives. §36.11.

18. b) Less ruminant meat, less waste. ⚠️ The steep part of the gradient, and the one place where household action is a meaningful share of the problem rather than a symbolic fraction. ⚠️ Both also save money (Ch 32). §36.8, §36.11.

19. b) Structural, decades, consistent opposition. ⚠️ Trans fat, salt, SSB reformulation, warning labels, folic acid — every one a default change, a reformulation or a price signal. ⚠️ And the five opposition arguments recur: nanny state, consumers won't accept it, jobs, the science isn't settled, educate instead. §36.13b.

20. b) Opportunity, floors, delay, products, externalities. ⚠️ And what the sequence says: the price on the shelf is the smallest of the numbers this book has costed, and it is the only one anybody is shown. §36.12, 🧾 §36.13.

Scoring

Three items worth checking regardless of score.

Question 12. ⚠️ Defaults beat decisions. It is the same finding as Chapter 33 §33.4, from a completely different direction.

Question 15. ⚠️ The second convergence. Chapter 37 is built on this and on Chapter 35 §35.10.

Question 20. ⚠️ Five 🧾 blocks, five different costs, and the receipt shows the smallest one.

⚠️ Part VI ends here. Part VII assembles it, and Chapter 37 carries this book's last threshold concept.