Water — OCR GCSE Food Preparation and Nutrition

Water is an essential nutrient in the diet, vital for hydration, temperature regulation, and chemical reactions in the body. In Food Preparation and Nutrition, students learn about its functions, sources, daily requirements, and the consequences of dehydration and overhydration.

Water is often overlooked as a nutrient, but it is vital for survival. In the OCR GCSE Food Preparation and Nutrition course, you need to understand the functions of water in the body, its sources, and the recommended daily intake. Water makes up about 60% of the human body and is involved in almost every bodily process, from digestion to temperature control. Without water, you cannot live for more than a few days.

This topic is part of the 'Nutrition' section of the specification. You will be expected to apply your knowledge to real-life scenarios, such as planning meals for athletes or elderly people, and to evaluate the importance of hydration for health. Understanding water also links to other topics like food safety (hygiene) and food science (e.g., water activity in food preservation).

In exams, questions on water can appear as short-answer questions (e.g., naming sources) or extended-response questions (e.g., explaining the importance of water for a specific group). You should be able to recall key facts and use them to construct logical arguments.

• →Functions of water: solvent, transport, temperature regulation, chemical reactions, lubrication.
• →Sources of water: drinks (water, milk, juice) and foods (fruits, vegetables, soups).
• →Recommended daily intake: about 1.5-2 litres for adults, but varies with age, activity, and climate.
• →Dehydration: symptoms (headache, fatigue, dry mouth) and causes (insufficient intake, excessive sweating).
• →Overhydration: rare but dangerous, leading to hyponatremia (low sodium levels).

• Functions of water in the body
• Consequences of water deficiency
• Recommended daily intake guidelines
• Sources of water in the diet

• 💡Always use the term 'hydration' and 'dehydration' in your answers to show understanding.
• 💡When discussing sources, include both drinks and foods – many students only mention drinks.
• 💡In extended answers, structure your response with clear points and link each point to a consequence or function.

• Misconception: Water has no nutritional value. Correction: Water is an essential nutrient because it provides no energy but is necessary for life.
• Misconception: You only need to drink when you feel thirsty. Correction: Thirst is a sign of dehydration; you should drink regularly throughout the day.
• Misconception: All fluids are equally hydrating. Correction: Some drinks like alcohol and caffeinated beverages can have a diuretic effect, increasing water loss.

1. 1Day 1-2: Learn the functions of water and create flashcards for each function with an example.
2. 2Day 3-4: Study sources of water and recommended intakes; practice calculating percentages from given data.
3. 3Day 5-6: Explore the consequences of dehydration and overhydration; write short paragraphs explaining each.
4. 4Day 7-8: Attempt past exam questions on water; mark your answers using mark schemes.
5. 5Day 9-10: Revise by teaching someone else or using active recall prompts; focus on weak areas.
6. 6Day 11-14: Take a timed practice paper and review mistakes.

• 📋Multiple choice questions on functions or sources of water – read carefully for 'not' or 'except'.
• 📋Short answer questions (1-2 marks) asking to name a source or function – be precise.
• 📋Extended response (6 marks) asking to explain the importance of water for a specific group – plan your answer with points and evidence.
• 📋Data analysis questions where you interpret a table of water content in foods – calculate percentages and compare.