Lactose intolerance

gascap

That is great for you. It did not work so well for me. My realization came when I was in my early 30s but nothing has helped to mitigate it. And just for the record there are certain things I have discovered are absolute no-nos Cream is one and CoolWhip is the other.
I will venture into a piece of pizza once in a while but I stay with lactiad capsules and lactose free milk or soy milk for comfort. The surprise was when I had some throat problems when eating a Salmon filet and later discovered that they are often coated with Casein, which is milk protein as I understand it.

Borek

How is milk protein related to lactose intolerance? I can be missing something but I don't see a connection.

bobze

Its not. Lactose intolerance is the result of not having enough lactase along the digestive epithelium (particularly in the jejunum). Lactase, is normally only kept in low amounts, so its easy for there to not be enough lactase to digest the lactose sugars.

If one were to consume too much lactose, the increase in a non-diffusable substrate changes the osmolar concentration of the lumen of the GI. This is what leads to diarrhea (osmotic diarrhea) and the other symptoms associated with lactose intolerance.

If you had a reaction to milk proteins (namely casein) you'd be having an allergic reaction to milk, not an intolerance to lactose (which is possible, though much more rare).

Proton Soup

my microbiology professor just yesterday stated in lecture that most lactose "intolerance" was actually an allergic reaction, but didn't elaborate. if so, that would make sense that casein causes problems for some, but i'm not quite sure what to make of it.

ebits21

It's perfectly logical, Native Americans are a migration of Asians and therefore share many traits with them.

bobze

Hmm, I don't know. I'm skeptical of that claim, which would imply allergic reaction being more prevalent than lack of an enzyme (which is in low capacity anyway). I've always learned its the other way around, but I'm not saying that is necessarily right. I've never looked into it before.

Anecdotally there is some things that lead me to believe your professor is wrong. Namely, that if the allergic reaction was predominant than this manifestation would be more common while the patients were children. Since lactose intolerance is generally a problem of aging, and as we age we have less lactase in the digestive epithelium, it would be counter-intuitive to think most cases of lactose intolerance (we see most in adults) are from allergies.

More anecdotal; can't say that I have ever known anyone with an allergy to milk (this would be a huge deal and drastically alter their life from the time they were a baby). Nor have I yet to a scratch test come up positive for a milk allergy, but I haven't seen that many scratch tests yet.

Anyway, could you ask your Prof for more information or look into it? I don't have time right now, block exams in T-minus 96 hours!

nismaratwork

Yeah, you're probably going to want to read this then! Oh children, they really are more than just little adults... they're a genuine pain in the posterior!

http://www.mayoclinic.com/health/milk-allergy/DS01008

MOST common?! I really would have guessed peanuts or nightshade relatives, and I'd have been wrong.

This is quite good, for one line I think you'll find supports the notion that lactose intolerance is distinct from milk allergy.

http://en.wikipedia.org/wiki/Milk_allergy


Bolding mine: I don't know about you, but I face-palmed there... of COURSE... you even mentioned scratch tests! Immune vs. Enzyme presents differently, and of course there's no risk of anaphylaxis from the latter.

nucleargirl

Hello all!
So, I was trying to eat milk everyday since like 6 months ago. I didnt stick to it very strictly cos I would forget or would have to work or something. Anyway, so in the past month or so... I have noticed no problems with milk anymore! I dont know if this is related to my diet, or to the radioactive iodine therapy I had in mid-March. But, awesome!!! no more bloating or otherwise!! milk galore!!! ahhhh so, there is the possibility of your body changing! but I dont know the cause of my change so... this revelation might not be very helpful for anyone else...
also my skin has cleared up in the last week! I have no idea why!

So to elaborate: I think I was still intolerant in January cos I remember buying lactose free milk on holiday. But during Easter I was staying with someone and we had a cup of normal milk for breakfast every day, and I had no problems. so thats when I noticed I wasn't intolerant anymore. not sure exactly when it happened cos I wasnt really looking out for changes the whole time.

Ouabache

If you didn't you would be hoisted by your own petard
I know I am replying to a dated post.

It seems to me, my h.s. biology instructor explained when we induce lactose intolerance by stopping consumption of dairy for a period, we could re-induce tolerance by reintroduction of dairy incrementally back to our diet. Your experience confirms her explanation.

My instructor of anthropology also pointed this out (that Native Americans populating both N and SA continents have the same common ancestry as the mongols of northern China). And based on his discussion of current knowledge, it seemed quite logical this occurred.

Just be sure you are tactful when explaining to a Native American that they didn't originate on the American continent. Several that I have mentioned this to, were not very receptive.