Dietitian-approved Costco grocery products that make eating well and losing weight more affordable.
Costco is a great place to shop, especially if you’re trying to lose weight on a budget. The Warehouse offers an abundance of fresh meat, fish, poultry and produce, as well as a wide selection of pre-made and packaged foods and beverages to fuel your workouts and support your weight loss goals. What should you buy at Costco if saving money and losing weight go hand in hand with your 2026 goals? We asked Tara Collingwood, MS, RDN, CSSD, LD/N, ACSM-CPT, certified sports dietitian and co-author of Flat stomach recipe book for dummiesfor his top 11 picks. Here are the 11 best Costco deals for weight loss in 2026.
Kirkland Signature Organic Fat Free Greek Yogurt
One of Collingwood’s best choices is Kirkland Signature Organic Non-Fat Greek Yogurt. “A high-protein, low-fat choice that’s 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. “High in fiber and no added sugar for smoothies, oatmeal or snacks without excess calories,” says Collingwood.
Oatmeal
Oatmeal, which can be purchased in bulk at Costco, is a great value for breakfast and offers many nutritional benefits. “A high-fiber whole grain that promotes satiety and consistent energy and is perfect for meal prep and healthy breakfasts,” says Collingwood.
Frozen salmon or chicken breasts
Frozen salmon or chicken breasts are perfect to store in the freezer to prepare for lunch or dinner. Costco still sells them much cheaper than traditional grocery stores. “Lean proteins that help build and maintain muscle while helping control appetite,” says Collingwood.
Safe Catch Ahi Tuna and Sardines Wild Planet
Safe Catch Ahi Tuna and Wild Planet Sardines are another one of her top picks at Costco. “Shelf-stable, high-protein seafood, rich in omega-3s, is an easy addition to salads, bowls or wraps,” she says.
Protein shakes
Costco sells protein shakes at a much lower price than other stores. “Ready-to-drink, high-protein drinks help reduce cravings and support daily protein goals (various brands),” she says.
Kirkland Signature Organic, High Fiber Hummus Snacks
Costco is also a great place to buy pre-portioned snacks that are actually good for you. She recommends Kirkland Signature Organic Hummus and other fiber-rich snacks. “Hummus to pair with veggies and whole grains,” she says.
Sparkling tonic drinks with low sugar content
Low sugar sparkling tonic drinks are another of Collingwood’s Costco choices. “Can make low-sugar mocktails or just use as flavored water and is a healthier alternative to sugary drinks,” she says.
Kirkland Signature Almond Flour and Hemp Hearts
Collingwood also puts Kirkland Signature Almond Flour and Hemp Hearts in its basket. “These are great for home baking and for increasing protein and healthy fats,” she says.
Green vegetables and produce
Don’t forget to stock up on greens and produce during your Costco run. These items are priced well below retail and make healthy eating easier. “Pre-washed leafy greens and bulk produce make it easy to fill half your plate with nutrient-dense, low-calorie foods,” says Collingwood.
Staples for a Healthy Pantry
And don’t skip all the healthy pantry staples, including quinoa, beans and other grains. “Whole grains and high-fiber legumes help reduce hunger and support plant-based eating habits,” says Collingwood.
Lea Groth
Leah Groth is an experienced editor and reporter for Best Life and Eat This, Not That! bringing readers the best new finds, trends and deals every week. Learn more about Léa
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