Diet and nutrition — OCR GCSE Physical Education

Diet and nutrition is a fundamental topic in GCSE Physical Education, focusing on how the food we eat affects our health, energy levels, and athletic performance. You'll learn about the seven essential nutrients: carbohydrates, proteins, fats, vitamins, minerals, fibre, and water. Each plays a specific role in the body, from providing energy to repairing tissues. Understanding these nutrients helps you explain why athletes need different diets depending on their sport, and how poor nutrition can lead to health issues like obesity or deficiency diseases.

This topic also covers energy balance—the relationship between energy intake (calories consumed) and energy expenditure (calories burned). You'll explore how to calculate Basal Metabolic Rate (BMR) and Physical Activity Level (PAL), and why maintaining a healthy weight is crucial for performance and long-term health. Additionally, you'll study the effects of hydration and the importance of a balanced diet for recovery after exercise.

Diet and nutrition connects to other areas of PE, such as training methods, fitness testing, and the effects of exercise on the body. It's not just about memorising food groups; it's about applying this knowledge to real-world scenarios, like designing a pre-match meal for a footballer or advising a marathon runner on carbohydrate loading. Mastering this topic will help you answer both short-answer questions and extended writing tasks in your exam.

• →The seven essential nutrients: carbohydrates (main energy source), proteins (growth and repair), fats (energy storage and insulation), vitamins (immune function, e.g., vitamin C), minerals (bone health, e.g., calcium), fibre (digestion), and water (hydration and temperature regulation).
• →Energy balance: energy intake (from food) must equal energy expenditure (BMR + physical activity) to maintain weight. Positive balance leads to weight gain; negative balance leads to weight loss.
• →Carbohydrate loading: a strategy used by endurance athletes to maximise glycogen stores before an event by increasing carb intake and tapering exercise.
• →Hydration: even 2% dehydration can impair performance. Water is lost through sweat, urine, and breathing; athletes need to drink before, during, and after exercise.
• →Special diets for athletes: e.g., high protein for strength athletes, high carb for endurance athletes, and balanced meals with proper timing (e.g., 3-4 hours before exercise).

• Definitions of health, fitness and well-being
• Physical, emotional and social benefits of physical activity
• Consequences of a sedentary lifestyle
• Components of a balanced diet (carbohydrates, proteins, fats, minerals, vitamins, fibre, water and hydration)
• Effect of diet and hydration on energy use in physical activity

• 💡Ensure you can define health, fitness and well-being separately
• 💡Use practical examples from physical activity and sport to illustrate the benefits of exercise
• 💡Be prepared to interpret and respond to data regarding health, fitness and well-being
• 💡Use specific examples: When explaining a nutrient's role, link it to a sport or activity. For instance, 'A marathon runner needs carbohydrates for sustained energy because they rely on aerobic respiration.' This shows application, not just recall.
• 💡Know your definitions: Be precise with terms like BMR (energy needed at rest) and PAL (multiplier for activity level). Examiners look for accurate use of key terminology.
• 💡Structure longer answers: For 6-mark questions, use PEEL (Point, Evidence, Explain, Link). Start with a clear point, back it with a fact, explain how it applies, and link back to the question.

• Confusing the definitions of health and fitness
• Failing to apply the benefits of physical activity to different age groups
• Inability to link specific dietary components to energy use in practical sporting examples
• Misconception: 'Protein is the main energy source for exercise.' Correction: Carbohydrates are the primary energy source, especially for high-intensity activity. Protein is mainly for repair and growth, not energy (unless carbs are depleted).
• Misconception: 'All fats are bad for you.' Correction: Unsaturated fats (e.g., from fish, nuts) are essential for health, providing energy and aiding vitamin absorption. Saturated fats should be limited, but not eliminated.
• Misconception: 'You only need to drink water when you feel thirsty.' Correction: Thirst is a late sign of dehydration. Athletes should drink regularly before, during, and after exercise to maintain performance and prevent heat illness.