I have had low potassium issues since getting sick. Lupus also hit my kidneys hard but they are functioning perfectly well but I do take meds (amlodipine, benazypril, and triamterene/hctz) for them just in case. Some meds like diuretics can cause low K by stimulating your kidneys to excrete K but I think some of my problems might be related to absorption problems. My GI tract has been strange ever since getting sick and I do not seem to absorb K or calories in general that well. Eating bananas doesn't touch it and I take 2 K pills daily in addition to eating more K rich foods daily and my levels are still low normal.
None of my doctors had a good explanation why my K was low and on essentially the same diet it was ok before getting sick in 2005. From that I would conclude it has to do with my disease(s) but since it is controlled and nothing else is happening I am not concerned.
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.