Recently, I started getting severe gas/stomach cramps that kept me up all night several times per week. I was worried that something was really wrong with me, like stomach cancer or IBS. I also had frequent diarrhea.
Turns out it's probably due to the new box of sugar free chocolate squares containing maltitol. One serving (3 squares) contains 12g of maltitol. Most days I ate one or two. Since I quit eating the maltitol chocolates (going back to my conventional sugar sweetened dark chocolates), I haven't had any cramping or diarrhea. So, 4-8 g of maltitol can trigger problems for me, apparently.