Hi,
I don't have lots of time - my hubby needs the computer - but I find bananas really help. Even before I started taking steroids I needed bananas to feel strong. Now I take supplements (potassium) and eat bananas. I've not had any trouble that I know of with sweetners - and I drink a lot of diet pop (my weakness).

Hope this helps - I'll maybe try to check in later and add a few more thoughts.
~Kathy