FN20: Food Processing & Technology
Understanding primary and secondary food processing, food additives, fortification, and how technology has changed the way food is produced and preserved.
Food Processing & Technology
Understanding primary and secondary food processing, food additives, fortification, and how technology has changed the way food is produced and preserved.
Key Fact: Primary processing converts raw food materials into basic ingredients: milling wheat into flour, pasteurising milk, refining sugar cane, and slaughtering and butchering animals.
Key Fact: Secondary processing converts primary-processed ingredients into more complex products: making flour into bread, milk into cheese, flour and sugar into biscuits, potatoes into crisps.
Key Fact: Food additives are substances added to food for a specific purpose: preservatives (extend shelf life), colourants (improve appearance), flavourings (enhance taste), emulsifiers (mix oil and water), stabilisers (maintain texture).
Key Fact: Additives are given E numbers when approved for use in the EU; some consumers prefer additive-free foods due to health concerns (e.g. hyperactivity linked to some colourants).
Key Fact: Fortification adds nutrients to food to improve public health: folic acid in flour, vitamins A and D in margarine, calcium in plant milks, iron in breakfast cereals.
Key Fact: Genetic modification (GM) alters an organism's DNA to produce desired traits: pest-resistant crops, vitamin-enriched rice (Golden Rice), herbicide-tolerant soya. GM food is controversial.
Key Fact: Food irradiation uses ionising radiation to kill bacteria, insects, and parasites; it extends shelf life but is not widely used in the UK due to consumer concern.
Key Fact: Extrusion cooking forces food through a shaped opening under high temperature and pressure; used for breakfast cereals, pasta shapes, and snack products.
Key Fact: Modified atmosphere packaging (MAP) replaces air in food packaging with a gas mixture (typically nitrogen and carbon dioxide) to extend shelf life without preservatives.
Key Fact: Ultra-processed foods (UPFs) are industrially formulated products with many additives; linked to obesity, heart disease, and other health problems when consumed in excess.
📋 Key Vocabulary and Concepts
For Food Processing & Technology, you must know:
- Primary processing
- Secondary processing
- Food additives
- E numbers
- Preservatives
- Emulsifiers
- Fortification
- Genetic modification (GM)
- Food irradiation
- Extrusion
- Modified atmosphere packaging (MAP)
- Ultra-processed food (UPF)
❓ Practice Questions
Q: What is the difference between primary and secondary food processing?
Q: Name four types of food additive and their purpose.
Q: What is food fortification and give two examples.
Q: What are E numbers?
Q: What is genetic modification and why is it controversial?
Q: Explain how modified atmosphere packaging (MAP) works.
Q: What is extrusion cooking and what products does it produce?
Q: Why are ultra-processed foods a health concern?
✅ Answers
- Primary processing converts raw materials into basic ingredients (e.g. wheat to flour, milk to pasteurised milk). Secondary processing turns those ingredients into finished products (e.g. flour to bread, milk to cheese).
- Preservatives (extend shelf life), colourants (improve appearance), flavourings (enhance taste), emulsifiers (allow oil and water to mix), stabilisers (maintain texture), thickeners (add body) (any four).
- Fortification is adding nutrients to food to improve public health. Examples: folic acid in flour, vitamins A and D in margarine, calcium in plant-based milks, iron in breakfast cereals (any two).
- E numbers are codes for food additives that have been approved as safe for use within the European Union. They cover preservatives, colourants, flavourings, emulsifiers, and other additive categories.
- GM alters an organism's DNA to produce desired traits (e.g. pest-resistant crops, nutrient-enriched rice). Controversy centres on unknown long-term health effects, environmental impact (cross-pollination with wild species), and ethical concerns about altering nature.
- MAP replaces the air in food packaging with a controlled gas mixture (typically nitrogen and carbon dioxide). This slows bacterial growth and oxidation, extending shelf life without adding chemical preservatives.
- A process where food is forced through a shaped opening under high temperature and pressure, cooking and shaping it simultaneously. Used for breakfast cereals, pasta shapes, crisp snacks, and textured vegetable protein.
- UPFs contain many industrial additives, are typically high in fat, sugar, and salt, and are low in fibre and nutrients. Regular consumption is linked to obesity, type 2 diabetes, heart disease, and certain cancers.
🎯 Exam Tips
- Always distinguish clearly between primary and secondary processing with specific examples.
- When discussing additives, categorise them by function (preservatives, colourants, etc.) and give examples.
- For GM food, present both the potential benefits (nutrition, yield) and concerns (health, environment, ethics).
- Learn the definition of fortification and be able to give at least two real examples used in the UK.
📝 Exam Technique
Food Preparation & Nutrition Exam Tips — Food Processing & Technology:
1. For Food Processing & Technology questions, show every step of your working clearly — method marks count even if the final answer is wrong
2. Check your answer makes sense in context (estimation, units, reasonableness)
3. Use correct mathematical notation and state formulae before substituting values
4. If a Food Processing & Technology question asks you to 'prove' or 'show', write a logical chain of reasoning with a conclusion line
5. For problem-solving, identify the topic first, then recall the relevant method
1. For Food Processing & Technology questions, show every step of your working clearly — method marks count even if the final answer is wrong
2. Check your answer makes sense in context (estimation, units, reasonableness)
3. Use correct mathematical notation and state formulae before substituting values
4. If a Food Processing & Technology question asks you to 'prove' or 'show', write a logical chain of reasoning with a conclusion line
5. For problem-solving, identify the topic first, then recall the relevant method
⚠️ Common Errors
✗ All food additives are artificial and harmful. ✓ Many additives are natural (e.g. citric acid from citrus fruits, beetroot red colouring). All approved additives have been tested for safety, and are only permitted at levels far below any harmful dose.
✗ E numbers are all artificial chemicals. ✓ E numbers include natural substances too — E300 is vitamin C (ascorbic acid), E101 is riboflavin (vitamin B2). The E number simply means the additive has been approved for EU use.
✗ GM food is dangerous to eat. ✓ There is no consistent scientific evidence that approved GM foods are harmful to eat. Concerns focus more on environmental impacts (cross-pollination, biodiversity) and ethical issues rather than food safety.
✗ Fortification means the same as enrichment. ✓ Fortification adds nutrients that were not originally present in the food (e.g. folic acid in flour). Enrichment replaces nutrients lost during processing (e.g. adding back B vitamins removed during flour milling).
✍️ Model Answer
Full-Mark Response
Explain the difference between primary and secondary food processing, giving examples. Discuss the role of food additives and evaluate their use in processed foods. (8 marks)
Primary processing converts raw food materials into basic usable ingredients. Examples include milling wheat into flour, pasteurising raw milk, refining sugar cane into sugar, and slaughtering and butchering animals into cuts of meat. Secondary processing transforms these primary ingredients into more complex finished products: flour into bread, milk into cheese or yoghurt, potatoes into crisps, and cocoa beans into chocolate. Food additives are substances added during processing for specific purposes. Preservatives (e.g. sulphur dioxide in dried fruit) prevent microbial growth and extend shelf life, reducing food waste. Colourants improve visual appeal (e.g. annatto in cheese), flavourings restore taste lost during processing, and emulsifiers (e.g. lecithin) allow oil and water to mix in products like mayonnaise and ice cream. Additives have benefits: they make food safer (preservatives prevent food poisoning), more convenient (longer shelf life), and more appealing. However, there are concerns: some synthetic colourants have been linked to hyperactivity in children, excessive preservatives may cause allergic reactions, and the ease of using additives enables ultra-processed foods high in fat, sugar, and salt. All approved additives (given E numbers in the EU) have been safety-tested, and are used at levels far below harmful doses. A balanced view recognises that additives serve important functions but should be used judiciously, with consumers enabled to make informed choices through clear food labelling.
📊 AO Deep Dive
Assessment Objective Analysis
AO1 (Knowledge & Understanding): Demonstrate knowledge and understanding of food processing & technology, including nutritional principles, food science, and food safety regulations.
AO2 (Application): Apply knowledge and understanding of food processing & technology to practical cooking contexts, recipe adaptation, and food choice decisions.
AO3 (Analysis & Evaluation): Analyse and evaluate food processing & technology in relation to nutritional needs, food safety, sustainability, and cultural factors. Justify decisions with reasoned arguments and evidence.
📝 Exam Questions by Topic
- AQA Past Papers - Topic Questions -- AQA
- Edexcel Past Papers - Topic Questions -- Edexcel
- OCR Past Papers - Topic Questions -- OCR
- Eduqas Past Papers - Topic Questions -- Eduqas
🎬 Video Resources
Ready to ace your GCSE Food & Nutrition exams?
Get the best revision books and guides to boost your grades.