AQA GCSE Food Preparation and Nutrition: Revision Guide

Here is a revision mind map to help you learn about energy: ENERGY Functions in the body Sources of energy in the diet Measurement Growth & movement Chemical reactions in the body Brain function Making sound Body warmth Carbohydrates Fats Protein kcals kJ 1g carbohydrate = 3.75 kcals / 16kJ 1g fat = 9 kcals /37kJ 1g protein = 4 kcals / 16kJ Converted to glucose in the body to produce energy Recommended daily intake of energy from: Carbohydrate = 50% Fat = 35% or less Protein = 15% energy energy used Balanced weight eaten energy used Weight gain energy eaten energy eaten energy used Weight loss Energy-dense foods contain lots of fat and sugar Amount of energy needed by body depends on: Basal Metabolic Rate (BMR) Physical Activity Level (PAL) Life Stage Energy balance Lack of energy in diet (energy deficiency) Gradual weight loss Too much energy in diet (excess) Gradual weight gain and obesity 33 7 Chapter 2: Nutritional needs and health : Energy needs