Common Misconceptions

Misconception: "Most digestion happens in the stomach."

Reality: The stomach mainly performs mechanical digestion (churning) and begins protein digestion using pepsin. The majority of chemical digestion — of carbohydrates, proteins, and fats — is completed in the small intestine, using enzymes from the pancreas (amylase, proteases, lipase) and from the intestinal wall itself. The small intestine is also the primary site of nutrient absorption.

Misconception: "Bile is an enzyme that digests fat."

Reality: Bile is not an enzyme and does not chemically break down fat molecules. Instead, bile emulsifies fats — it breaks large fat globules into many smaller droplets, increasing the surface area for lipase enzymes to act on. It is lipase (produced by the pancreas) that actually digests fat into fatty acids and glycerol.

Misconception: "The large intestine absorbs nutrients from digested food."

Reality: By the time food reaches the large intestine, virtually all nutrients have already been absorbed in the small intestine. The large intestine's primary role is to absorb water from the remaining indigestible material, forming solid faeces. It also reabsorbs electrolytes (salts) and harbours bacteria that produce some vitamins.