Hello Scarlet.
Low carbing has two possible effects on intestinal function.
One of these is constipation.
The other effect is diarrhea.

I get the second one. So I take a capsule of psyllium husks every day to make things more normal. The capsule is handier to swallow than the powder form. Psyllium is also the treatment for constipation.

If you could eat the bars before LCing, I'd bet that LC has the same effect on you as it does on me.