We also have issues with gums and had to avoid them for a couple of years.

I just added them back in at Christmas and have been allowing it on weekends since then. So far so good. I wouldn't suggest it every day for anyone though... gums are gums... they make things gooey and hard to break down.

Put some in a glass with a bit of water... some fllour if you want and then try to wash the glass out... It's hard because the gums make it stick... So, it makes sense that it might give some trouble with some people.