How do different nutrients get digested?

Different nutrients - carbohydrates, proteins, and fats - are digested through specific enzymes and processes in various parts of the digestive system.

Each type of nutrient follows a distinct pathway for complete breakdown into absorbable forms.

Digestion of carbohydrates:

• Mouth: Salivary amylase begins the breakdown of starch into maltose.

• Small intestine: Pancreatic amylase continues digestion.

• Intestinal enzymes (maltase, sucrase, lactase) convert disaccharides into monosaccharides like glucose.

End product: Glucose (absorbed into blood)

Digestion of proteins:

• Stomach: Pepsin breaks proteins into peptides in an acidic environment.

• Small intestine: Trypsin and other enzymes further break peptides into amino acids.

End product: Amino acids (absorbed into blood)

Digestion of fats:

• Small intestine:

  • Bile emulsifies fats into small droplets

  • Lipase breaks fats into fatty acids and glycerol

End product: Fatty acids and glycerol (absorbed into lymph via lacteals)

Summary of digestion sites:

• Carbohydrates → mouth + small intestine

• Proteins → stomach + small intestine

• Fats → mainly small intestine

Importance:

• Ensures complete breakdown of food

• Enables efficient absorption of nutrients

• Supports energy production and body functions

In simple terms: Carbohydrates become glucose, proteins become amino acids, and fats become fatty acids and glycerol through specific enzymes in the digestive system.