6 Best Costco Foods for Muscle Building in the New Year

Are you trying to build muscle in 2026? There are certain foods you should be eating, according to Tara Collingwood, MS, RDN, CSSD, LD/N, ACSM-CPT, a Board Certified Sports Dietitian and co-author of the Flat Belly Cookbook for Dummies. The first category? Lean meats and seafood. “Core muscle-building staples for meals,” she says. Also, make sure to eat dairy products, such as yogurt. “Great for snacks and recovery shakes,” she explains. Protein powder can also help you achieve your protein goals. “Handy when you’re on the go or need fast post-workout protein,” she says. And finally, she recommends seeds and fish as “easy add-ons to salads, bowls, and breakfasts for extra amino acids.” You can get most of these at your local Costco. Here are the 6 best Costco foods for muscle building in the new year.

Kirkland Signature Boneless Skinless Chicken Breasts

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