Lactose intolerance is not an alergy, in fact it is the more normal state then lactose tolerance. All adult animals and about 70% of the human population are lactose intolerant. The problem is that we are not equiped to digest the lactose suger present in milk, but the bacteria in the later stages of digestion is able to extract a lot of energy from the lactose. So you get a bloom of gut bacteria causing lots of issues.
Coeliac disease is an autoimune disorder, similar to allergies but not quite. There are also wheat allergies which are different from coeliac disease. Celiacy affects the small intestines compared to the large intestines of lactose intolerance. There are many different symptoms, many not too different from allergies except their location. And the end result of these are bad digestion which can again cause the gut bacteria to get lots of sugars.
A lot of diseases in the digestion system have very similar symptoms. This is because you only have one output and very few nerves connected to it. So there is generally only a few ways a disease can be expressed. So there are actually very little connection between coeliac disease and lactose intolerance except the organ they affect.
However there are some recent research connecting gluten intolerance (distinct from coeliac) and lactose intolerance. This is still unconfirmed and may be a dead end. However it is possible that it is not the gluten causing the gluten intolerance but instead fructones which is often found in the same grains that contain much gluten. Lactose is one type of fructone. So it might actually be the same issue just expressed with different fructones. This research may lead to some sort of cure of gluten intollerance, in short term maybe gut microbia transplants works. Or maybe it will lead to the development of low fructone high gluten grains.
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