food substances

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  1. 4. They are our main source of energy. Starch(淀粉）and sugar are two forms that consist of carbon, hydrogen and oxgen.
  2. 5. It makes up about 65% of our body weight. It is the main component of our living cells and blood.
  3. 7. They can divided into vitamin A, vitamin C and vitamin D.
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  1. 1. Calcium, iron and iodine (碘) are their main members.
  2. 2. It is found in foods that come from plants, e.g. grain products, vegetables and fruits.
  3. 3. They are important materials for growth and repair of our body tissues (身体组织）. Infants （婴儿）and children grow quickly and thus have a great need for foods such as meat, fish, eggs, milk, cheese and beans.
  4. 6. They are important materials for making cell membranes(细胞膜), nerve cells and certain hormones.They are contained in foods such as meat, cheese, and butter.