I get those from my local Asian market, along with a treasure trove of info oddities from its owners. It's all in the seasoning for things.
Rarity of Celiac disease (which can be hereditary) has been somewhat a misnomer and a lot more common that most people realize. This is due to the decades or generations of the rarity in diagnosis and treatment (which is as simple as not eating wheat that sees results in a very short time). That's changing though, newer studies and opinions are moving the number up. True, death is very rare from the disease itself, but nutrient deficiencies are causes of so many other things that do cause death and at the very least lower quality of life, surgeries, medical emergencies, etc.
If you eat nothing but cheese pizza with no other toppings and nothing else, I will presume that direct death by pizza has got to be extremely rare, but you could die with cause listed on the certificate as a heart attack and/or suffer a multitude of major problems (and medical expense). Hunger in the world is more than just not enough food, a big percentage of that is not having enough nutrition or nutrients consumed (eating only one kind of grain, may be plenty of it, but lacks the nutritional needs), which in turn causes all the problems shown in the pictures of children that we see asking for help.
Celiac disease and gluten cause the lack of nutrient value in the foods you eat which in turn causes so much else. I have to surmise that the problem is much more common than we realize and not so rare as it is portrayed. But I digress.
“The markets can remain irrational longer than you can remain solvent.”
John Maynard Keynes