Potato is a carb for energy.

When cat foods contain "ash & magnesium" . . . low ash formulas are better for cats with history/tendency of UTI's.

Have you ever read about the benefits of apple cider vinegar and pets? I use the ACV on the scruff of the neck for cats who have "weepy" eyes and guess what - it actually works.

Here is the link to the page concerning UTI's. Info on some "earth" friendly remedies for UTI's in cats:
http://www.earthclinic.com/Pets/bladder_infection.html

This is the link to the index page for ACV and pets:
http://www.earthclinic.com/pets.html#u