Celiac’s disease, it’s the disease commonly known to actually cause you to have an allergy or extreme tolerance to glutens, wheats, etc.  This will cause you to throw up or otherwise lose extreme amounts of weight in general terms.  Most people don’t know what is wrong with them, and they don’t know how to respond to it in so many ways.  However, they continue to lose weight and they continue to have problems in general terms, because they don’t know how to respond to it.  It is easy treated when one stops eating gluten products.   However, many have trouble finding out what it is.  For example, there is a diet called the brat diet.   Many times, when children start throwing up for unknown reasons and otherwise showing symptoms of Celiac’s disease, they eliminate all foods except for bread among a couple of other things and slowly start introducing certain foods back into the diet to figure out where the allergies lie.  However, of course, if you are eating bread, you will continue to experience these problems, and many in the past have been baffled by it for understandable reasons.  However, it is definitely worth considering, and in some ways it can be tested for if you are wondering if you happen to fall into this particular category.