The relationship between diet and health — OCR GCSE Food Preparation and Nutrition

The relationship between diet and health explores how nutritional choices impact bodily function, disease risk, and overall wellbeing. A balanced diet provides essential nutrients in correct proportions, while imbalances—such as excess saturated fat, salt, or sugar—can lead to conditions like obesity, type 2 diabetes, cardiovascular disease, and dental caries.

This topic explores the fundamental link between what we eat and how our bodies function. It covers the major nutrients—carbohydrates, proteins, fats, vitamins, minerals, and water—and their roles in growth, repair, energy provision, and disease prevention. You'll learn about the UK healthy eating guidelines, such as the Eatwell Guide, and how they translate into practical dietary advice.

Understanding this relationship is crucial for making informed food choices and for public health. Poor diets are a leading cause of preventable diseases like obesity, type 2 diabetes, cardiovascular disease, and some cancers. By studying this, you'll be able to analyse diets, identify nutritional imbalances, and suggest improvements—skills that are assessed in both written exams and the non-examined assessment (NEA).

This topic also connects to food science and food safety, as cooking methods can affect nutrient retention and the addition of fats, salt, or sugar. It forms the basis for understanding special dietary needs, such as for athletes, pregnant women, or those with conditions like coeliac disease.

• →Balanced diet: consuming nutrients in correct proportions to meet energy and physiological needs.
• →Macronutrients (carbohydrates, proteins, fats) provide energy and building blocks; micronutrients (vitamins, minerals) regulate body processes.
• →Energy balance: energy intake vs energy expenditure; excess leads to weight gain, deficit leads to weight loss.
• →Diet-related diseases: obesity, type 2 diabetes, cardiovascular disease, dental caries, osteoporosis, anaemia.
• →Government guidelines: Eatwell Guide, 5 A DAY, sugar and salt recommendations.

• Importance of a healthy, balanced diet
• Application of major commodity groups to achieve a balanced diet
• Knowledge of government healthy eating guidelines and regulations
• Understanding of diet-related health issues and diseases (obesity, cardiovascular disease, CHD, diabetes, diverticulitis, bone health/osteoporosis, dental health, anaemia, high blood pressure)

• 💡Ensure you can explain the link between specific dietary habits and the development of chronic conditions
• 💡Be prepared to apply government healthy eating guidelines to different life stages
• 💡Use precise terminology when discussing diet-related diseases
• 💡Practice interpreting nutritional data to assess the healthiness of a diet
• 💡Use specific nutrient names and functions—don't just say 'vitamins are good for you'. For example, 'Vitamin D aids calcium absorption for bone health'.
• 💡When discussing diet-related diseases, always link the nutrient to the disease mechanism (e.g., 'excess salt increases blood pressure, straining the heart').
• 💡In evaluation questions, consider both short-term and long-term effects, and mention vulnerable groups (e.g., children, elderly).

• Failing to link specific nutrients or food groups to the prevention of specific diseases
• Confusing the roles of different macronutrients in maintaining health
• Inaccurate application of government guidelines to specific dietary scenarios
• Generalising health impacts without referencing physiological or psychological effects
• Misconception: 'All fats are bad for you.' Correction: Unsaturated fats (e.g., from nuts, olive oil) are beneficial for heart health; it's excess saturated and trans fats that increase disease risk.
• Misconception: 'Skipping meals helps with weight loss.' Correction: Skipping meals can lead to overeating later and nutrient deficiencies; regular balanced meals support metabolism and satiety.
• Misconception: 'Diet only affects physical health.' Correction: Diet also impacts mental health, concentration, and mood; for example, omega-3 fatty acids support brain function.

1. 1Week 1: Learn the functions and sources of each nutrient. Create flashcards for vitamins and minerals, focusing on deficiency diseases.
2. 2Week 1: Study the Eatwell Guide and government recommendations (e.g., 5 A DAY, sugar limits). Practice applying them to sample diets.
3. 3Week 2: Focus on diet-related diseases—create a table linking nutrient excess/deficiency to specific conditions and mechanisms.
4. 4Week 2: Practise exam questions, especially 6-mark 'evaluate' questions. Use mark schemes to self-assess.
5. 5Week 2: Revise energy balance and do calculation practice (e.g., % energy from fat).

• 📋Multiple choice: Identify a nutrient's function or a deficiency disease. Tip: Read all options carefully; some are partially correct but not the best answer.
• 📋Short answer (1-2 marks): Name a nutrient and its function. Tip: Be specific—e.g., 'calcium for strong bones'.
• 📋Data analysis: Interpret a food label or dietary survey. Tip: Calculate percentages and compare to guidelines.
• 📋Extended response (6 marks): Evaluate a diet or discuss the impact of a nutrient on health. Tip: Structure with PEEL (Point, Evidence, Explanation, Link).