Post by student01 on Jun 19, 2016 17:40:05 GMT
All living things need food for energy, growth and repair, movement and protection from disease.
A balanced diet contains the right amount of the food types essential for healthy living.
A balanced diet contains six constituents;
Carbohydrates, fats, proteins, vitamins, minerals and water.
A food pyramid suggests the daily number of servings of each of the five food groups.
Fats have twice the energy value of carbohydrates or proteins.
Experiments;
To test for starch; Add iodine to the food eg. potatoes. The food will turn blue-black in colour.
To test for reducing sugar; Add some glucose in a test tube and add benedict's solution to the food. Heat gently in a water bath. The food will turn blue then orange/red.
To test for proteins; Add sodium hydroxide and copper sulfate or biuret reagent. The food will turn purple in colour
To test for for fats; Squeeze food in grease-proof paper. A translucent spot will appear.
A balanced diet contains the right amount of the food types essential for healthy living.
A balanced diet contains six constituents;
Carbohydrates, fats, proteins, vitamins, minerals and water.
| Type | Source | Function |
| Carbohydrate | Bread, potatoes and sugar | Quick release of energy |
| Protein | Meat, fish and vegetables | Growth and repair |
| Fat | Butter, oils and margaraine | Slow release of energy |
| Vitamins | Vitamin C from oranges Vitamin D from milk | Vitamin C for healthy skin and gums Vitamin D for strong bones and teeth |
| Minerals | Calcium from milk and eggs Iron from spinach and liver | Calcium for strong bones and teeth Iron for making red blood cells |
| Water | Drinks and vegetables | Prevents dehydration |
| Fibre | Cereals and vegetables | Prevents constipation |
Fats have twice the energy value of carbohydrates or proteins.
Experiments;
To test for starch; Add iodine to the food eg. potatoes. The food will turn blue-black in colour.
To test for reducing sugar; Add some glucose in a test tube and add benedict's solution to the food. Heat gently in a water bath. The food will turn blue then orange/red.
To test for proteins; Add sodium hydroxide and copper sulfate or biuret reagent. The food will turn purple in colour
To test for for fats; Squeeze food in grease-proof paper. A translucent spot will appear.