Where does the digestion of carbohydrates predominantly begin?

Where does the digestion of carbohydrates predominantly begin?

• A. In the stomach
• B. In the mouth
• C. In the small intestine
• D. In the esophagus

Answer: (B)

The digestion of carbohydrates predominantly begins in the mouth due to the presence of saliva, which contains an enzyme known as salivary amylase. This enzyme initiates the breakdown of starches into simpler sugars as food is chewed and mixed with saliva. The action of chewing not only mechanically breaks down the food but also allows the enzyme to effectively start the biochemical process of digestion before the food moves further along the digestive tract.

In contrast, the stomach does not play a significant role in carbohydrate digestion as it primarily acts on proteins, and its acidic environment inactivates salivary amylase. The small intestine continues the digestion and absorption process of carbohydrates, but the initial breakdown starts in the mouth. The esophagus is primarily a conduit for food and does not contribute to digestion. Thus, the mouth is indeed the correct starting point for carbohydrate digestion.