First, the difference in the composition of milk sources
- Casein type: The protein in milk is mainly divided into casein and whey protein, of which casein accounts for about 80%. While -casein is the main component of casein, there are two types, A1 and A2. A2 milk source refers to the milk that cows only produce A2 type - casein, while general milk sources may contain both A1 and A2 types.
Genes determine the source of milk: The type of casein in a cow is determined by its genes. Initially, all domesticated cattle contained only A2 - casein. However, with the rise of livestock farming in ancient Europe, some dairy cows developed genetic mutations that led to the emergence of A1-casein, and this mutation was inherited. As a result, today's dairy cows produce only A2 casein and A1 and A2 casein.
Second, the difference in digestion and absorption
Gastrointestinal adaptation: A2 The structure of -casein in milk is closer to that of protein in breast milk, so it may be smoother in digestion and absorption in the human body. In contrast, the -casein protein in A1 milk may produce some gastrointestinal symptoms such as bloating, diarrhea, etc. during digestion.
Infant and toddler adaptability: For infants and toddlers, their digestive systems are not yet fully developed and their adaptation to food is relatively poor. Therefore, choosing formula milk from A2 milk source may be more conducive to the digestion and absorption and healthy growth of infants and young children.
3. Differences in health effects
BCM-7 and health risks: As mentioned earlier, the -casein protein in the A1 milk source may produce a peptide called BCM-7 during digestion. Some studies suggest that BCM-7 may be associated with an increased risk of certain health problems, such as cardiovascular disease, diabetes, autism, and respiratory dysfunction. However, most of these studies are based on animal experiments or epidemiological investigations, and the applicability of their conclusions to humans still needs to be confirmed by further scientific research.
Individual Differences and ChoicesIt is important to note that there may be individual differences in how each person responds to A1 and A2 milk sources. Some people may not have any discomfort with the A1 milk source, while others may experience significant gastrointestinal symptoms. Therefore, when choosing a milk source, you should choose according to your own physical condition and actual needs.
Fourth, suggestions for practical application
Know what you needBefore choosing a milk source, you must first understand your physical condition and needs. For example, if you are lactose intolerant or prone to gastrointestinal upset, consider trying A2 milk products.
Pay attention to product labelsWhen buying dairy products, you can pay attention to the ingredient list on the product label to find out whether the product is labeled with A2 milk source. At the same time, it is also necessary to pay attention to choosing products that are nutritionally balanced and meet national standards.
Consult a professional: If you still have doubts about the difference between A2 milk source and general milk source, you can consult a professional doctor or dietitian. They can provide personalized advice and guidance based on your specific situation.
In conclusion, there are certain differences between A2 milk sources and general milk sources in terms of composition, digestion and absorption, and health effects. When choosing, you should choose according to your actual situation and needs, and pay attention to the label and nutrition facts list of the product. At the same time, we should also keep an open mind, as scientific research continues to deepen, our understanding of A2 milk source and general milk source will be constantly updated and improved.