For quite some time it is common to hear how heavy the milk falls to many adult people. While some of them have lactose intolerance diagnosed by a doctor, others simply claim that milk is indigestible. As a result of this widespread phenomenon the truth is that on the shelves of supermarkets have been filled with milk with the label "lactose" and does not seem to be a transient trend. Some countries (such as Australia, New Zealand, China, Malaysia, Hong Kong, United States or United Kingdom) have gone further and this milk has come a direct competition: the so-called milk A2, whose "power", say their promoters, is that it is easily digestible. Some studies endorse this theory and point to a protein called A1 as the main culprit that the milk feels bad to some people. But what exactly is hidden under this denomination?
Milk proteins depend on cow genetics
The Betacaseínas A1 and A2 are the majority proteins of milk, explains Àlex Bach, researcher in the ruminant production area of the Institute of Agro-alimentary research and Technology (IRTA): "Usually the milk we eat contains a mixture of Both. " In fact, it continues, "a cow producing one, another, or both at the same time is a matter of genetics."
But, in the decade of 1990, a company of New Zealand decided to start the production of a milk that only contains the A2 (the mark A2 Milk), giving license of distribution to the producers of this type of milk and excluding those that also produced with the protein A1 , which is the most common in milk produced in European cabins, the United States and Australia.
There is no scientific evidence that the A1 produces diseases
"It all began because of a hypothesis raised in the 1990s that the A1 presented an association with type 1 diabetes and also with certain coronary problems. In this context, the company of New Zealand patented the production of milk A2 to combat that type of diabetes, and later they took another patent to, according to them, produce a milk A2 that diminished the inflammatory processes, "Bach explains.
his data were based on experiments carried out only with animals, and were not conclusive. When these were later repeated in other parts of the world and in an orchestrated way between different research centers, no link between the A1 and diabetes was found. Nor with the inflammation that allegedly provokes (observed only in animals), attributed to a biopeptide called BCM-7, "a casomorfina that occurs when digesting the casein A1 and containing histidine, an amino acid that can cause inflammation, although Nor are there any clear conclusions about this, "Bach clarifies. A Casomorfina, he adds, is a type of molecule made up of amino acids that has a particular characteristic, is an opioid (such as morphine) and, as such, slows the intestinal transit, which in principle is positive: aid in digestion, and catching sleep; In other words, what is expected to cause milk in infants.
Thus, although it was wanted to advertise that the A1 was the "bad protein of the film", in 2009 a review of all the studies carried out by the European Food Safety Authority (EFSA) counterclaimed These statements: EFSA did not find No relationship between drinking milk with protein A1 and certain noncommunicable diseases, such as type 1 diabetes, heart ailments and even autism, diseases that achacaban to the A1.
Nor is it clear that it is indigestible
When all this was denied, then the promoters of milk A2 argued that the protein A1 was indigestible and caused symptoms normally associated with lactose intolerance. They have focused two studies done with people, one published in the year 2016, and certainly have shown that the A1 causes some gastrointestinal inflammation in some of them.
However, says Dr. Nicholas Fuller of the Charles Perkins Center for Australian Medicine in an article published in the conversation, it is necessary to observe these results cautiously: "Despite some statistically significant changes Between the two milk groups, these are not necessarily clinically relevant and therefore need more research in a much larger study, based on a larger sample. " If you have never had problems with milk, suggests, there is no evidence that drinking milk that only contains A2 is going to provide you with any benefit. If you have lactose intolerance, then lactose-free milk is already serving you. But mostly eat dairy, says Fuller. At least three times a day.
Something that undoubtedly makes Rosamund Young, author of the Book of The Secret Life of the cows and Propetala of the first organic and self-sufficient farm of the United Kingdom, called Kite's Nest. Young tells in his book How it is the existence of these animals in his farm located in the county of Worcestershire, where they live in complete freedom, oblivious to the controversy of proteins and the author of the prologue, the British novelist Alan Bennet, emphasizes that all the waiters They can by their taste distinguish from which cow each milk comes: "Everyone knows that the milk of different races has distinctive characteristics in taste and quality. A change in diet also affects the taste of milk. But cows of the same breed and age also produce different milks and variable fat content. " At home, says Young, milk bottles are labelled with the name of the cows they come from, which each family member consumes according to their preferences. It does not count any of the milks A1 or A2, but everything indicates that it does not worry the least.