Costco can make keto incredibly easy—or quietly derail your progress. In this guide, I share what actually ends up in my Costco cart, from protein staples and frozen foods to quick snacks that don't leave me hungry an hour later. You'll also learn which popular "keto" products I skip, the biggest Costco mistake keto beginners make, and how to build a simple shopping cart that supports weight loss instead of sabotaging it. Whether you're new to keto or trying to get back on track, these are the Costco foods I buy again and again.