Food Expiration Dates You Should Follow
nytimes.com
nytimes.com
Though some of that may be lost in translation - it seems that the entire page is a direct translation from German, and the majority of the references also seem to be in German, which I do not speak so cannot really verify myself. I do note that one of the articles used as a references, also in German and apparently at least login-walled so cannot read, is titled "Histamine intolerance: lack of reproducibility of single symptoms by oral provocation with histamine: A randomised, double-blind, placebo-controlled cross-over study" - which doesn't seem to support the statement that is a referenced to in the article.
From an outsider POV is seems pretty weird that there's a pretty big proportion of people (1 in 100 meaning millions) suffering from this that doesn't seem to have been investigated in English medical circles at all.
You can prevent them by simply putting things like flour bags in air-tight sealable containers. If you catch some weevils in a bag of flour before it turns into an infestation, you can freeze the flour for four to six days to kill any eggs and larvae and sift out the remains.
If you don't mind the very slight possibility of flavor contamination, you can also store garlic cloves or bay leaves openly near your flour, which naturally repel weevils.