ELi5: What determines the reaction the body has to dairy?

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I am slightly lactose intolerant. I only say “slightly” because *think* I have a higher tolerance to dairy than other people but ofc still have limits.

A little TMI below so please be warned ^^;

Like for today for instance. I ate a Philly cheesesteak (it was so good), it didn’t give me diarrhea, but it did soften my stool and made me go about 15~25 minutes after eating it. But there are other times where I have dairy and it will just give me mild constipation.

In: Biology

6 Answers

Anonymous 0 Comments

The gene mutation appeared in Northern Europe, so more people with European ancestors tolerate dairy then with other ancestors.

How you prepare the dairy also matters. Hard / aged cheese contains no lactose. Fresh cheese contains only a little. Butter also have little lactose. This is because most of the whey are removed.

Yogurt and fermented milk like buttermilk has less lactose than fresh milk. The bacteria that causes the fermentation feeds off the lactose/milk sugar.

Food made from whey have a lot of lactose. Protein powder might contain a lot of whey, also some candies.

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