Christian Foss | Body Transformation Coach on Instagram: "Who knew Costco had a secret menu!!? Comment “PROTEIN” for my full high protein Costco grocery list 👇 I wish I knew this information earlier on in my fat loss journey Beef has always been a staple in my diet. With that said, the leanest beef Costco sells in their frozen section is 91/9% lean... which is what I’ve been buying for years. You might say is 4% really that big of a difference? When you are in a weight loss phase and your daily