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I have a few friends who avoid most dairy products (liquid milk especially) because they have a bad reaction after eating those foods, even in small quantities. Some of them avoid all dairy products, but others seem to be okay with certain dairy products like butter or cheese or ice cream.

What are the different conditions that can cause people to have a bad reaction to dairy products? Why are some people able to consume some dairy products but not others?

closed as off-topic by Erica May 26 '18 at 15:57

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about vegan or vegetarian lifestyle, within the scope defined in the help center." – Erica
If this question can be reworded to fit the rules in the help center, please edit the question.

  • Is this really a vegetarianism question? – Erica May 25 '18 at 14:01
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There are two different reasons that people might have a bad reaction to dairy products. Some high-fat dairy products (like butter) can be consumed by people who are lactose intolerant with minimal adverse effects.

Cow's Milk Protein Allergy

When people with cow's milk protein allergy consume any amount of protein from cow's milk (present in all dairy products) their bodies produce an immune response against the milk proteins. This reaction often occurs very soon after ingestion (seconds or minutes). Because the immune system response is probably not proportional to the amount of milk protein consumed, people with cow's milk protein allergy should avoid consuming any quantity of any kind of dairy product.

The prevalence of cow's milk protein allergy (CMPA) vary from 2% to 7.5%. (source)

Lactose Intolerance

When people with lactose intolerance consume foods that contain lactose (milk sugar), their digestive system is unable to break down the sugar into parts small enough to be metabolized. The milk sugars carry on further into the digestive tract and are fermented by bacteria, producing a large amount of gas. The amount of gas produced is proportional to the amount of lactose consumed -- a smaller amount of milk will produce a smaller effect.

Because lactose is milk sugar, any dairy product which is low in sugar also has a low amount of lactose. For example, butter is made by removing the buttermilk which contains most of the sugars, so people who are lactose intolerant won't have as much reaction to butter.

Liquid cow's milk always contains milk sugars, and therefore contain lactose. Even lactose-free milk still contains lactose, but has lactase enzyme added to assist with digestion of the milk sugars.

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The short answer, because most of the dairy products are not suitable for human consumption.

The longest, more detailed answer:

  1. Human body can be trained to deal with the milch of animals, but it is a completely unnatural process.
  2. People with different Blood Type and Dosha react differently to diary products.
  3. The digestive capacity of diary product are significantly defined in infancy.
  4. Diary products are essentially foreign substances for the human body what is trying to deal with it as quick as possible. A clean body can cleanse toxins (supliment overdose, alien substances etc) quickly, a weighted body spend much more time and energy to recognize unknown substances.
  5. Some process methods can prepare milch for easier human consumption, but even in this case the used culture have different effect on different body type.
  6. and the list can go on…

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