What personal hygiene rules must a cook follow, and why does each one keep food safe?
Understanding and demonstrating knowledge of the importance of personal hygiene when preparing food, including handwashing, clean clothing and the rules for hair, jewellery and illness.
An SQA National 5 Practical Cookery answer on personal hygiene, covering handwashing, clean protective clothing, hair, jewellery, hand injuries and reporting illness, and explaining how each rule stops harmful bacteria reaching food.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
Jump to a section
What this dot point is asking
The SQA wants you to know the personal hygiene rules a cook must follow and, just as importantly, to explain why each rule keeps food safe. In the practical activity you have to demonstrate these rules; in the question paper you have to describe and justify them.
Why personal hygiene matters
Food poisoning is caused by harmful bacteria (and sometimes viruses) getting onto food, multiplying, and then being eaten. The human body is one of the main places these bacteria come from: they live on the skin, in the hair, in the nose and mouth, and in the gut. Personal hygiene is the set of habits that stops bacteria moving from the cook to the food.
Handwashing
Handwashing is the single most important personal hygiene rule, because the hands touch everything.
The reason handwashing is so effective is that bacteria from raw food and from the toilet sit on the skin and under the nails, and soap and water lift them off so they go down the drain instead of onto the next food you touch.
Clothing, hair and jewellery
What you wear and how you present yourself also carries bacteria.
- Clean apron or protective clothing. Outdoor and everyday clothes pick up dirt and bacteria. A clean apron worn only in the kitchen keeps these away from the food.
- Hair tied back. Loose hair carries bacteria and can fall into food. Tie long hair back, and in a professional kitchen a hat or hairnet is worn.
- No jewellery. Rings, watches and bracelets trap food particles and bacteria, and stones can fall into food. Remove them before cooking. A plain wedding band is sometimes allowed in industry, but at home the safest rule is to take rings off.
- No nail varnish or false nails in a professional kitchen, because chips can fall into food.
Cuts, illness and behaviour
The reason illness is so serious is that the symptoms of a stomach upset come from harmful bacteria in the gut, which end up on the hands and can be passed to food even after washing, spreading the illness to everyone who eats it.
Common mistakes
Examples in context
Example 1. Starting a practical exam. Before touching any ingredient, a candidate ties their hair back, puts on a clean apron, removes their watch and rings, and washes their hands. The marker can see good hygiene is in place from the start.
Example 2. A small cut while chopping. A candidate nicks a finger. They stop, wash the cut, cover it with a blue waterproof plaster, and if needed wear a disposable glove over it, then carry on. This keeps blood and bacteria out of the food and keeps the plaster visible.
Try this
Q1. Give two times during cooking when a cook must wash their hands. [1 mark]
- Cue. Any two of: before starting, after handling raw meat, after the toilet, after touching the bin or face.
Q2. Why are cuts covered with a blue plaster rather than a skin-coloured one? [1 mark]
- Cue. Blue is not a natural food colour, so the plaster is easy to spot if it falls off into the food.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA N5 style4 marksDescribe two personal hygiene rules a cook should follow when preparing food, and for each explain how it helps keep the food safe.Show worked answer →
A 4-mark describe-and-explain answer needs two rules, each with a clear food-safety reason, so plan two description marks and two explanation marks.
Rule 1. Wash your hands thoroughly with soap and warm water before starting, after handling raw meat, and after using the toilet or touching the bin. This is important because hands carry bacteria such as those from raw chicken, and washing removes them so they are not transferred onto ready-to-eat food.
Rule 2. Wear a clean apron and tie long hair back. A clean apron stops dirt and bacteria from outdoor clothes reaching the food, and tying hair back stops loose hairs, which carry bacteria, falling into the dish.
Other rules that would score include covering any cuts with a blue waterproof plaster, removing rings and watches that trap food and bacteria, and not coughing or sneezing over food.
Markers reward each correct rule (1 mark) and each correct food-safety reason (1 mark). Just listing rules with no reason caps the answer at 2 marks.
SQA N5 style3 marksExplain why a cook who has a stomach upset should not prepare food for other people.Show worked answer →
This question tests the idea that an ill cook is a source of harmful bacteria, so the answer must link the illness to food poisoning.
A stomach upset such as diarrhoea or vomiting is usually caused by harmful bacteria living in the gut. These bacteria are present on the hands and can be transferred onto food even after careful handwashing.
If that food is then eaten by other people, the bacteria can multiply and cause them to suffer food poisoning too, so the illness spreads.
For this reason a cook who is ill, especially with sickness or diarrhoea, should stay away from food preparation until they are clear of symptoms, and in the workplace must report the illness to a supervisor.
Markers reward identifying that the illness means harmful bacteria are present, that these can transfer to food, and that this would cause food poisoning in others.
Related dot points
- Understanding and demonstrating knowledge of the importance of a clean and safe working environment, including cleaning as you go, washing equipment correctly and the safe disposal of waste.
An SQA National 5 Practical Cookery answer on kitchen and equipment hygiene, covering clean-as-you-go, washing up in the right order, sanitising work surfaces, the safe disposal of waste and keeping the kitchen pest-free, and why each keeps food safe.
- Understanding and demonstrating knowledge of cross-contamination, its causes, and the methods used to prevent it, including separating raw and ready-to-eat food and using colour-coded equipment.
An SQA National 5 Practical Cookery answer on cross-contamination, covering what it is, the three routes it travels (direct, by hands and by equipment), and how to prevent it by separating raw and ready-to-eat food, using colour-coded boards and cleaning thoroughly.
- Understanding and demonstrating knowledge of the safe storage of food, including the danger zone, fridge and freezer temperatures, the conditions bacteria need to multiply, and the correct cooking and reheating of food.
An SQA National 5 Practical Cookery answer on safe food storage and temperature control, covering the four conditions bacteria need, the danger zone, fridge and freezer temperatures, storing food correctly, and the safe cooking, cooling and reheating of food.
- Understanding and demonstrating the organisational skills of a practical, including selecting ingredients and equipment, accurate weighing and measuring, working to a time plan, and presenting and garnishing the finished dish.
An SQA National 5 Practical Cookery answer on the organisational skills of a practical, covering selecting ingredients and equipment, accurate weighing and measuring, working to a time plan, dovetailing tasks, and presenting and garnishing the finished dish.
- Understanding and demonstrating a range of cooking methods, including boiling, simmering, steaming, poaching, frying, grilling, baking and roasting, what each method does to food, and choosing a suitable and healthy method for a dish.
An SQA National 5 Practical Cookery answer on methods of cooking, covering boiling, simmering, steaming, poaching, shallow and deep frying, stir-frying, grilling, baking and roasting, what each method does to food, and how to choose a suitable and healthy method for a dish.
Sources & how we know this
- SQA National 5 Practical Cookery Course Specification — SQA (2026)
- Food Standards Scotland - Hygiene at home — Food Standards Scotland (2024)