Answer:
The enzyme that is responsible for assimilating lactose is the enzyme called lactase, which our body manufactures in the first years of life, after this, if we continue to ingest milk (either bovine or human) this enzyme will be forced to continue to be synthesized, and this is how an enzymatic adaptation occurs over time.
Some people cannot comply with this adaptation and this leads to autoimmune problems when it comes to ingesting dairy products and their derivatives to varying degrees.
Step-by-step explanation:
On the other hand, the immune response can be more or less harmful according to the genetic predisposition of the person, there are people who have an immunological genetic code oriented to rheumatological failure, and it is there that they do not tolerate any derivative of lactose, and they can even present autoimmune diseases parallel to this problem.
The immunological response to lactose is because it is considered an intestinal antigen, which is due to the absence of metabolism as its own since the person cannot adapt and continue to encode the lactase enzyme throughout their life.
This immune response can even generate an immune infiltrate in the connective tissue walls juxtaposed to the intestinal mucosa.