Solution:

• Most of the nutrients in food fall into three major groups: proteins, fats, and carbohydrates.
• The two main forms of carbohydrates are sugars (such as fructose, glucose, and lactose) and starches, which are found in foods such as starchy vegetables, grains, rice, breads, and cereals.
• Carbohydrates provide your body with energy.
• The simplest are sugars, like glucose, fructose, sucrose and lactose.
• Complex carbohydrates, like starch, are made up of lots of sugar molecules joined together.
• The ‘identity tags’ (antigens) on the surface of all cells are made from carbohydrates joined to proteins.