The major function of carbohydrates is to provide much of the that cells require.

The major function of carbohydrates is to provide much of the energy that cells require. Carbohydrates are broken down in the body into glucose, which can be used immediately for energy or stored in the liver and muscles for later use. This process happens in several steps:

1. Digestion: When you consume carbohydrates, your body breaks them down into simple sugars, which are absorbed into the bloodstream.

2. Absorption: As the sugar level rises in your body, the pancreas releases a hormone called insulin. Insulin is needed to move sugar from the blood into the cells, where it can be used as a source of energy.

3. Conversion to Energy: Inside the cells, the sugar is broken down through a process called cellular respiration, which produces ATP, the primary energy currency of cells.

4. Storage: If the body has more glucose than it needs, it can store a small amount in the liver and muscles. This stored form of glucose is made up of many connected glucose molecules and is called glycogen.

5. Release of Stored Energy: When your body needs a quick boost of energy or when you're not getting glucose from food, your body can break down glycogen back into glucose.

So, the major function of carbohydrates is to provide the energy that cells require to function properly.