Lactose Tolerance facts

While investigating facts about Lactose Tolerance Test and Lactose Tolerance Mutation, I found out little known, but curios details like:

Ancient DNA shows how recent adult lactose tolerance is, in evolutionary terms. 20,000 years ago, it was non-existent. Today, about 1/3 of all adults have tolerance. That lightning-fast evolutionary change suggests that direct milk consumption must have provided a serious survival advantage

explain how lactose tolerance has evolved in humans?

Until 11,000 years ago milk was toxic to humans, that the only way we could consume it was lowering the lactose levels by turning it into cheese, that today only one third of adults are lactose tolerant, and that the closer you get to the equator the lower the tolerance level is.

What is the difference between lactose tolerance and lactose intolerance?

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across answering what is the proper procedure for performing a test for lactose tolerance. Here are 10 of the best facts about Lactose Tolerance Map and Lactose Tolerance Meaning I managed to collect.

what is lactose tolerance?

1. Humans are able to digest milk past childhood only because of a genetic mutuation. Only 40% of the World adults could digest milk properly. Rest are Lactose Intolerant or have reduced Lactose Tolerance after infancy.

2. Lactose Tolerance developed in humans only 10,000 yrs ago with domestication of animals. Most people worldwide are still Lactose Intolerant.

3. Most scientists believe that everyone was originally lactose intolerant and that lactose 'tolerance' is a relatively new thing in human's evolutionary biology.

4. Lactose tolerance (being able to digest milk) is a mutant form of the lactase gene in humans, an genetic adaptation to a long history of dairy-herding societies, that allows children and adults to digest milk long after the infant nursing period when the gene would normally deactivate.

5. Stone age adults were lactose intolerant and tolerance for lactose is an still ongoing evolutionary process

6. Lactose tolerance in adults is the result of the change in one single base pair in human DNA, and scientists have identified several different spots near the gene for lactase that have this same effect

7. Even though almost all Indians consume milk products less than one-fifth of Indians are Lactose tolerant

8. People's hair colour changes over time for the same reason we lose our lactose tolerance: the genes that determine hair colour might only turn on later in our lives