Technological developments to support better health and food production — OCR GCSE Food Preparation and Nutrition Revision

    Energy balance explores the relationship between food intake and physical activity, focusing on how individuals maintain a healthy body weight throughout l

    Topic Synopsis

    Energy balance explores the relationship between food intake and physical activity, focusing on how individuals maintain a healthy body weight throughout life. It covers the calculation of energy requirements, the sources of energy in the diet, and the factors influencing these needs.

    Key Concepts & Core Principles

    Examiner Marking Points

    Technological developments to support better health and food production

    OCR
    GCSE

    Energy balance explores the relationship between food intake and physical activity, focusing on how individuals maintain a healthy body weight throughout life. It covers the calculation of energy requirements, the sources of energy in the diet, and the factors influencing these needs.

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    Objectives
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    Exam Tips
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    Pitfalls
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    Key Terms
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    Mark Points

    Topic Overview

    Technological developments in food production and health have revolutionised the way we grow, process, and consume food. From precision agriculture using GPS and drones to monitor crop health, to genetic modification (GM) that enhances yield and nutritional content, technology addresses challenges like food security, sustainability, and health. For example, hydroponics and vertical farming allow crops to be grown in controlled environments with minimal water and land use, reducing the carbon footprint of food transport. These innovations are crucial as the global population grows and climate change threatens traditional farming.

    In food processing, technologies such as high-pressure processing (HPP) and pulsed electric fields (PEF) preserve food without heat, retaining more nutrients and flavour while extending shelf life. This reduces food waste and improves food safety. Additionally, developments in packaging—like modified atmosphere packaging (MAP) and active packaging—help maintain freshness and reduce spoilage. Understanding these technologies is essential for students to evaluate their benefits and drawbacks, such as cost, consumer acceptance, and ethical concerns around GM foods.

    This topic fits into the wider subject by linking food science, nutrition, and sustainability. It prepares students to make informed choices as consumers and future food professionals. By examining real-world examples, students learn how technology can address issues like malnutrition, obesity, and food deserts. Mastery of this content is vital for exam questions that ask for evaluation of technological impacts on health and food production.

    Key Concepts

    Core ideas you must understand for this topic

    • →Precision agriculture: Use of GPS, sensors, and drones to monitor soil, water, and crop health, optimising inputs like fertiliser and water to increase yield and reduce environmental impact.
    • →Genetic modification (GM): Altering an organism's DNA to improve traits such as pest resistance, shelf life, or nutritional value (e.g., golden rice with added vitamin A).
    • →High-pressure processing (HPP): A non-thermal preservation method that uses high pressure to inactivate pathogens, extending shelf life while maintaining flavour and nutrients.
    • →Modified atmosphere packaging (MAP): Replacing the air inside a package with a specific gas mixture (e.g., nitrogen, carbon dioxide) to slow spoilage and preserve freshness.
    • →Hydroponics and vertical farming: Soilless growing methods using nutrient-rich water, often in stacked layers, allowing year-round production with less water and land.

    What You Need to Demonstrate

    Key skills and knowledge for this topic

    • Understanding of Basal metabolic rate (BMR) and physical activity level (PAL) in determining energy requirements
    • Ability to calculate energy values and identify main sources of energy
    • Knowledge of recommended percentage of daily energy intake
    • Identification of energy sources: protein, fat, carbohydrate and alcohol
    • Understanding of units (kcal and kJ) for measuring energy
    • Knowledge of factors influencing energy requirements: gender, life stage, pregnancy/lactation, size/body weight, genetics, occupation and lifestyle
    • Understanding of the consequences of deficiency and excess

    Marking Points

    Key points examiners look for in your answers

    • Understanding of Basal metabolic rate (BMR) and physical activity level (PAL) in determining energy requirements
    • Ability to calculate energy values and identify main sources of energy
    • Knowledge of recommended percentage of daily energy intake
    • Identification of energy sources: protein, fat, carbohydrate and alcohol
    • Understanding of units (kcal and kJ) for measuring energy
    • Knowledge of factors influencing energy requirements: gender, life stage, pregnancy/lactation, size/body weight, genetics, occupation and lifestyle
    • Understanding of the consequences of deficiency and excess

    Examiner Tips

    Expert advice for maximising your marks

    • 💡When evaluating a technology, always discuss both advantages and disadvantages. For example, GM crops can increase yield but may reduce biodiversity. Use specific examples like Bt corn or golden rice to show depth.
    • 💡Link technological developments to the principles of sustainability: water use, energy consumption, food miles, and waste reduction. Examiners reward answers that show awareness of environmental impact.
    • 💡Use correct terminology (e.g., 'high-pressure processing' not 'pressure cooking') and explain how the technology works briefly. This demonstrates understanding rather than just recall.

    Common Mistakes

    Pitfalls to avoid in your exam answers

    • Misconception: GM foods are always unhealthy or dangerous. Correction: GM foods undergo rigorous safety testing and can be engineered to be more nutritious (e.g., golden rice) or require fewer pesticides, though ethical and environmental concerns remain.
    • Misconception: Organic farming uses no technology. Correction: Organic farming still uses technology like drip irrigation, weather forecasting, and biological pest control; it simply avoids synthetic chemicals and GM.
    • Misconception: All processed foods are bad for health. Correction: Processing technologies like HPP and freezing can preserve nutrients and make food safer; it's the addition of salt, sugar, and fats that often reduces healthiness.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Basic understanding of food spoilage and preservation methods (e.g., canning, freezing).
    • •Knowledge of nutrients and their functions in the human body.
    • •Awareness of sustainability issues in food production (e.g., food miles, carbon footprint).

    Likely Command Words

    How questions on this topic are typically asked

    Calculate
    Explain
    Describe
    Identify

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