OCR GCSE Food Preparation and Nutrition (J309): Food, the science of cooking (Section C) overview
An overview of the food science content in OCR GCSE Food Preparation and Nutrition (J309), mapping why food is cooked and heat transfer, the cooking methods, the functional and chemical properties of proteins, carbohydrates, fats, oils, fruit and vegetables, and raising agents, and how they are examined.
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The food science content of OCR GCSE Food Preparation and Nutrition (specification J309) explains the chemistry behind cooking: why recipes behave as they do. It sits in Section C: Cooking and food preparation and underpins both the written paper and the Food Investigation Task. This page maps the topic and links to a focused answer page for each part.
The food science content
- Why food is cooked and heat transfer
- The reasons for cooking (safety, digestibility, palatability, variety, shelf life) and the three methods of heat transfer (conduction, convection, radiation). See Why food is cooked and heat transfer.
- Cooking methods
- The water-based, fat-based and dry methods, how each affects nutrients, flavour and texture, and how to choose one. See Cooking methods.
- Functional and chemical properties of protein
- Denaturation, coagulation, foam formation and gluten formation. See Properties of protein.
- Functional and chemical properties of carbohydrate
- Gelatinisation, dextrinisation and caramelisation. See Properties of carbohydrate.
- Fats, oils, fruit and vegetables
- Shortening, aeration, plasticity, emulsification, and enzymic browning. See Fats, oils, fruit and vegetables.
- Raising agents
- Biological (yeast), chemical (bicarbonate of soda, baking powder) and mechanical (air, steam). See Raising agents.
How this topic is examined
Food science is assessed on the written paper J309/01 (1 hour 30 minutes, 100 marks, 50%), through structured questions and six-mark extended responses that ask you to explain the science behind making a named product. It is also the backbone of NEA 1, the Food Investigation Task, where you test the working characteristics and functional and chemical properties of ingredients.
How to study the food science topic
- Pair every term with a food example. Gelatinisation with a sauce, denaturation with an egg, gluten with bread, shortening with pastry, caramelisation with toffee.
- Learn the heat transfer for each method. Convection for boiling, radiation for grilling, conduction for frying, all three for baking.
- Know the conditions. Gelatinisation needs liquid and heat; yeast needs warmth, moisture, food and time.
- Practise the six-mark questions. Explain the science of making a meringue, a white sauce or a loaf of bread.
For the official specification
OCR publishes the full specification, past papers and mark schemes at ocr.org.uk. Always revise from the current specification and OCR's own past papers, because question style is board-specific.