Science // B1 // Biology // Food, Nutrition // p2.

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  • Food, Nutrition and Diet (Part 2)
    • Food tests
      • Protein can be tested using the Biuret test. This involves adding a piece of food to a copper sulphate solution with a small amount of sodium hydroxide added.
        • The light blue colour changes to purple if the proteins are present
      • Fats can be seen to be present in food if a white emulsion is made after mixing the food with water and ethanol. This is called the alcohol emulsion test.
        • A white emulsion is tiny droplets of fat in water.
      • Carbohydrates come either as starch or sugars.
        • If you add a few drops of iodine to food it will go blue or black is the starch is present.
    • Weight
      • Reaching a healthy weight and maintaining it is important for overall health and can help you prevent and control many diseases and conditions.
      • Overweight
        • If you are overweight or obese, you are at a higher risk of developing serious health problems, including heart disease, high blood pressure, gallstones and cancer.
        • Overweight is having extra body weight from muscle, bone, fat and water.
        • Obesity is having a high amount of extra body fat. BMI is a useful measure of overweight and obesity.
          • BMI is a measure of body fat based on height and weight that applies to men and women.
            • BMI Categories
              • Underweight
                • 18.5
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