The Digestive Enzymes Trivia Quiz

Understanding the Role of Lactase Enzyme in Digesting Lactose

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Welcome, trivia enthusiasts, to a deep dive into the world of digestive enzymes! Today, we are delving into a popular question from The Digestive Enzymes Trivia Quiz and looking deeper into their role in digesting lactose.

So, are you ready to test your knowledge and uncover the role of lactase in the human body? Let’s dive in!

Here’s Our Question of the Day

See if you can answer this question from The Digestive Enzymes Trivia Quiz before reading on.

Unpacking Lactose: The Complex Carbohydrate

Lactose, the correct answer to the question, is a type of sugar found in milk and dairy products. It is a disaccharide composed of two simple sugars, glucose and galactose.

This sugar is a crucial source of energy for young mammals, including human infants who depend on lactose in breast milk for growth and development. However, as individuals age, some may become lactose intolerant due to a decline in lactase production.

The Role of Lactase: Breaking Down Lactose

Lactase, the enzyme responsible for digesting lactose, is produced in the small intestine. Its function is to break down lactose into its constituent sugars, glucose and galactose, which can then be absorbed by the body for energy.

In individuals with lactose intolerance, the body either produces insufficient lactase or does not produce it at all. This leads to undigested lactose reaching the colon, where it ferments and causes symptoms such as bloating, diarrhea, and stomach cramps.

Common Misconceptions and Sources of Lactose

While milk is a well-known source of lactose, it is important to note that lactose can also be found in various other foods, including certain processed meats, bread, cereal, and salad dressings. Checking food labels for hidden lactose is crucial for those with lactose intolerance.

Misconceptions About Lactase Enzyme

While lactase enzyme helps digest lactose, the sugar found in milk and dairy products, there are common misconceptions about its role. Let’s debunk some of these misunderstandings.


Contrary to popular belief, lactase enzyme is not responsible for digesting gluten. Gluten is a protein found in wheat, barley, and rye. Those with celiac disease have an immune response to gluten, leading to damage in the small intestine. Lactase and gluten are unrelated in their digestive functions.


Cellulose is a type of fiber present in plant cell walls. It provides structure to plants and is indigestible by humans due to our lack of cellulase enzyme, necessary for breaking it down. Lactase enzyme does not aid in the digestion of cellulose. Remember, fiber like cellulose contributes to digestive health by promoting bowel regularity, but it’s not broken down by lactase.


Fructose is a sugar found in fruits, honey, and high-fructose corn syrup. The digestion of fructose involves different enzymes like sucrase and fructase, not lactase. Confusing lactase with enzymes that break down fructose is a common misconception. Lactase specifically targets lactose, the sugar in dairy products, for proper digestion.


In a nutshell, lactase is the superhero enzyme that swoops in to save the day when it comes to digesting lactose, the pesky sugar found in dairy products.

So, next time you savor a scoop of ice cream or a cheesy slice of pizza, remember to thank lactase for its digestive prowess!

Feeling inspired to test your knowledge further? Why not challenge yourself with our Digestive Enzymes Trivia Quiz and explore more fun facts about nutrition and wellness! It’s time to flex those brain muscles and nourish your mind.

Professor Leonard Whitman