Dietitian-approved Costco groceries that make eating well and losing weight more affordable.
Costco is a great place to shop for groceries, especially if you are trying to lose weight on a budget. The warehouse carries an abundance of fresh meat, fish, poultry, and produce, as well as a wide selection of pre-made and packaged food and beverages to fuel your workouts and support weight-loss goals. What should you buy at Costco if saving money and weight loss go hand-in-hand with your 2026 goals? We asked Tara Collingwood, MS, RDN, CSSD, LD/N, ACSM-CPT, a Board Certified Sports Dietitian and co-author of the Flat Belly Cookbook for Dummies, for her top 11 picks. Here are the 11 best Costco deals for weight loss in 2026.
Kirkland Signature Organic Greek Nonfat Yogurt
One of Collingwood’s top picks is Kirkland Signature Organic Greek Nonfat Yogurt. “A high-protein, low-fat choice ideal for breakfast, snacks, and smoothies. Keeps you full longer and supports muscle maintenance during weight loss,” she says.
Frozen Organic Berries
Frozen Organic Berries are another must-buy, especially the Kirkland Signature brand, which offers great value. “Fiber-rich and no added sugar for smoothies, oatmeal, or snacking without excess calories,” says Collingwood.
Oatmeal
Oatmeal, which can be purchased in bulk at Costco, is an excellent value for breakfast and offers many nutritional benefits. “A high fiber whole grain that supports satiety and steady energy and perfect for meal prep and balanced breakfasts,” says Collingwood.
Frozen Salmon or Chicken Breasts
Frozen Salmon or Chicken Breasts are great to keep in the freezer for cooking lunch or dinner. Costco always sells them for a lot less than traditional grocery stores. “Lean proteins that help build and maintain muscle while assisting with appetite control,” says Collingwood.
Safe Catch Ahi Tuna & Wild Planet Sardines
And, make sure not to overlook the healthy pantry essentials, such as quinoa, beans, and other grains. “Fiber-rich whole grains and legumes help to curb hunger and promote plant-based eating habits,” according to Collingwood. Please rewrite the following sentence. Please rewrite the following sentence: “The cat chased the mouse around the house.”
Healthy Pantry Staples
