Lactose Intolerance: Why Many Asians Cannot 'Digest' Milk?

The video explains how young mammals digest lactose using the enzyme lactase, which breaks down lactose into glucose and galactose. As humans age, lactase production declines, leading to lactose intolerance in many adults. The prevalence of lactose intolerance varies globally, with high rates in East Asia and lower rates in Scandinavia. Some lactose intolerant individuals can consume dairy without issues, possibly due to intestinal flora differences. Cultural adaptations, such as consuming fermented dairy products, help some lactose intolerant groups. Geographical factors, like climate, influence lactase persistence, with higher rates in regions favorable to cattle farming. Evolutionarily, lactase persistence developed as a selective advantage in dairy-consuming populations, particularly after the Neolithic Revolution.

What enzyme is responsible for breaking down lactose in young mammals?

• Amylase

• Lactase

• Protease

• Lipase

Which region has the highest percentage of lactose intolerance?

• Central Asia

• Scandinavia

• South America

• East Asia

Why can some lactose intolerant individuals consume fermented dairy products without issues?

• Fermented products contain more lactase

• Fermented products are consumed in smaller quantities

• Fermented products have lower lactose levels

• Fermented products are easier to digest due to added enzymes

How does climate affect the prevalence of lactose intolerance?

• Lactose intolerance is higher in regions with moderate climates

• Climate has no effect on lactose intolerance

• Colder climates increase lactose intolerance

• Warmer climates increase lactose intolerance

What historical event is linked to the development of lactase persistence in humans?

• The Neolithic Revolution

• The Renaissance

• The Agricultural Revolution

• The Industrial Revolution