Some sugar free sweets can give you the runs. Had a little box of tunes (sugar free) and had tummy upset. Hubby is sugar intolerant and have to remind him to look for SMALL print on sugar free stuff . They often say may cause laxative effect.
Caffeine can cause the runs because it stimulates your flat muscle to react... So basically what is not ready to come out is stimulated to come out.. fast!
The more unpure the coffee is the worse these types of reactions are.
Stick to a pure coffee bean and this will not happen.
-JEN-