question: i have been drinking sugar free monster drinks for several months, i replaced diet coke and started drinking them. my meds. keep my mouth dry and i drink them all day long. one after another. like i did diet coke. i drink coffee in the mornings and that is all i drink. now my feet have a lot edema in them, i have taken 40mg of lasix for several days with no results. can these monster drinks cause this?