On a trip to Malaysia and Singapore I pigged out on mangosteen. Not for health reasons, but because I love the taste of the fruit. I found out the hard way that there are no toilets in the jungle..... cleaned me out real good!
Good timing of this question. I was going to ask the same thing. Tonight I was looking at "After Eight" chocolates. The label says glucose syrup which wouldn't flag anything for me. However, the Japanese label (I live in Japan) translates it as "mizuame" which is a sweetener BUT they say what it was derived from and it says wheat. I put them back. Then I came back to Google this and various sites said glucose syrup is so processed there is no gluten even if it was originally derived from wheat.......
Problem with Japanese chocolates is that I find them "waxy." Maybe soy lecithin? I just ordered some chocolate from the US. Not as convenient as popping in to a store to get some but that may be a good thing.
I did notice last week I was extremely exhausted. I took a nap every day. Since I quit the chocolate a few days ago I have been fine! I haven't felt tired or sluggish at all.