Olivia Brennan

Certified Veterinary Nutritionist & Creator of Cat Calorie Tool

I spent six years in a specialty animal hospital in Seattle, sitting across from worried cat parents who were doing everything right — except the math. They were feeding the best food they could afford. They were following the bag's instructions. They were giving "just a few" treats. And their cats were still gaining weight.

That's not a failure of love. That's a failure of information.

I built Cat Calorie Tool from my kitchen table in Portland, Oregon, after I burned out on corporate pet food marketing. The same companies that make prescription diets were also making the treats that undo those diets. I couldn't reconcile that anymore. So I left, adopted a second rescue cat (Luna, the Siamese mix with opinions), and started building tools that actually help people.

Milo — my 7-year-old orange tabby — lost 3.2 pounds on the same plan I recommend here. It took 14 months. I cried at every vet weigh-in. I also learned that sustainable weight loss for cats isn't about deprivation. It's about precision.

That's what this site is. Precision, presented like a friend over coffee.