1. Industrial production affects the taste. In the past, milk mainly came from cows fed by themselves, and the scale was relatively small, and the production process was relatively traditional, which could naturally retain the nutrients and original flavor of milk. Nowadays, most of the milk comes from milk factories. Large-scale technology will pay more attention to output and cost, so it is difficult to ensure freshness while giving consideration to taste and nutrition, thus affecting the original taste of milk.

2. Variety improvement pursues yield. In order to increase milk production, most modern factories choose to improve high-yield dairy cow varieties. However, this variety improvement will also have an impact on protein, cream and other ingredients in milk, which will inevitably affect the taste of milk.

3. The influence of genetically modified food. Modern factories feed cows with genetically modified crops, which will affect consumers through milk. At present, there is no conclusion, but some studies have shown that genetically modified foods will have a subtle influence on milk, which is also a factor of taste change.

4. Additive adjustment ingredients. In order to adjust the ingredients or improve the shelf life, factories will add certain additives to milk, such as whey powder and vegetable oil. Appropriate addition may have little effect, but excessive addition will undoubtedly affect the original taste and taste of milk.

5. Filling and storage affect freshness. It is difficult to guarantee the freshness of large-scale milk after long-term storage and transportation. The loss of freshness is also a factor affecting the taste of milk.

Therefore, generally speaking, industrial production technology, variety improvement, the use of genetically modified food, the addition of additives and the loss of freshness are the main reasons that affect the taste of modern milk, which is also an important explanation that the present milk is not as delicious as before.