Top 11 Costco Deals for Weight Loss in 2026

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.