Science // B1 // Biology // Food, Nutrition // p2.
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- Created on: 12-11-14 12:23
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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.
- 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.
- 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
- Untitled
- Underweight
- BMI Categories
- BMI is a measure of body fat based on height and weight that applies to men and women.
- Food tests
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