You heard somewhere that when your cat reaches the age of seven — or was it nine? — it's time to switch him to a senior food formula. That seems to make sense; after all, you've most likely changed your own diet as you've aged, cutting back on calories and carbohydrates and increasing supplements.
But is what's right for you also right for your cat? Not necessarily.
"One size does not fit all," emphasizes Lisa Freeman, DVM, PhD, a board-certified veterinary nutritionist at Cummings School of Veterinary Medicine at Tufts University.