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Nutritional yeast (which you can buy in natural and bulk food sections of grocery stores) is a super-healthy food supplement for your cat. You can mix a tablespoon of it into wet food, or toss it through dry food. Cats love the taste, and it gives them an extra protein boost so they don't get hungry again as quickly. This is helpful in fighting obesity, which often becomes a problem as cats get older. Nutritional yeast is also rich in B-vitamins and iron, and it will help the cat's coat grow thicker and shinier.
For a natural flea remedy, you can also just brush some of the yeast straight into the cat's fur; the fleas don't like it, and the cat will enjoy cleaning itself off.