The study said that the gene did not mutate to make people allergic to milk

Introduction: scientists in the United States and Finland have found that a gene mutation in the human body helps the digestive system digest and absorb lactose Because most dairy products, especially milk, are rich in lactose, people who do not have this adaptive mutation often show an allergic reaction to milk Scientists point out that people who can't digest lactose due to genetic problems will suffer from nausea, abdominal pain, flatulence and diarrhea after drinking milk, eating cheese or eating other dairy products, with 30 to 50 million people in North America alone suffering from the disease These studies confirm that lactose allergy is obviously a genetic disease, and scientists have found that the gene that causes the disease is a recessive gene, that is, only when parents are carriers of the gene or patients with the disease, their offspring will inherit the disease "This is the first time that the scientific community has confirmed that genetic mutations, caused by DNA changes, contribute to the digestion and absorption of lactose, and that the absence of mutations in this gene is the" culprit "of lactose allergy," said Lina peltona, a genetics expert at the University of California, us In the study, pelltona and his colleagues analyzed the genes of 196 volunteers from nine Finnish families who had varying degrees of lactose allergy Finally, they found a defect in a gene responsible for making a biochemical enzyme that breaks down lactose Scientists say newborn babies have the ability to digest and absorb lactose, but that ability disappears after they are weaned "After people began to produce dairy products, the genes in their bodies changed to adapt to the digestion and absorption of dairy products, while the genes in lactose allergy patients still maintain the original DNA sequence, which is the inherited defect that makes them suffer from diseases," said petona