The science of Lactose Intolerance

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What is lactose intolerance?

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Lactose intolerance is the inability to digest lactose, a sugar found in milk and dairy products, due to a deficiency of the enzyme lactase.

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What is lactase?

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Lactase is an enzyme produced in the small intestine that breaks down lactose into glucose and galactose, allowing for its absorption.

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What are common symptoms of lactose intolerance?

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Common symptoms include bloating, gas, diarrhea, and abdominal pain after consuming lactose-containing foods.

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What is lactase persistence?

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Lactase persistence is the continued production of lactase into adulthood, allowing individuals to digest lactose without discomfort.

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How does lactase deficiency affect glucose levels in the blood?

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In individuals with lactase deficiency, lactose is not broken down, leading to lower glucose levels in the blood after lactose consumption.

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Why is milk considered a source of calories for early humans?

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Milk provided a reliable source of calories and nutrients during times when other food sources were scarce, promoting survival.

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What role does genetics play in lactase persistence?

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Genetics determine whether an individual continues to produce lactase into adulthood, with certain populations having higher rates of lactase persistence.

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What is the significance of baseline glucose testing in experiments?

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Baseline glucose testing establishes a reference point for measuring changes in glucose levels during an experiment.

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What happens to lactose in the digestive system of lactose intolerant individuals?

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In lactose intolerant individuals, lactose is not digested and ferments in the gut, leading to gas and discomfort.

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Can all humans consume lactose as infants?

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True, all human infants can typically digest lactose due to the presence of lactase, which decreases in many individuals after weaning.