Dietitian reveals the best Costco bulk foods high in protein and fiber for weight loss.
Everyone I know shops at Costco, even nutritionists and dietitians. Although the warehouse sells many high-calorie products, including almost all of the famous bakery’s products, it also has many healthy options. My go-to nutrition expert, Tara Collingwood, MS, RDN, CSSD, LD/N, ACSM-CPT, certified sports dietitian and co-author of Flat stomach recipe book for dummiesis one of millions of Costco members who shop at the store. She recently shared her wholesale shopping list with me. “I like this list overall because it focuses on nutrient-dense, minimally processed foods, which are exactly what we’re looking for to support weight loss. But it’s important to remember: No single food causes weight loss. These foods work because they help with satiety, blood sugar control, and overall diet quality. Even healthy foods like nuts, almond flour, and seeds are high in calories, so portion size still matters. Loss Weight loss ultimately depends on overall calorie balance, not just choosing ‘healthy’ foods,” she says. “For weight loss, I focus on foods high in protein, fiber, and healthy fats because they help you stay full longer and reduce overeating. Buying them in bulk can also make it easier to stick to healthy habits.” Here are 9 Costco bulk foods dietitians who swear by weight loss.
Kirkland Organic Greek Yogurt

Kirkland Organic Greek Yogurt is always recommended by health and fitness experts. “High in protein, which helps with satiety and the preservation of lean muscle mass during weight loss,” she says. “Note: This is not ‘zero sugar’ as it contains natural lactose, but it is without added sugar. » An additional bonus? It’s creamy and delicious.
Kirkland Shelled Hemp Hearts


She is also a fan of Kirkland Shelled Hemp Hearts. “Provide healthy fats, proteins and minerals. Fats help with satiety, but portion size is important because they are high in calories,” she says.
Wild sockeye salmon


Wild sockeye salmon is another of his favorite purchases. “Rich in protein and omega 3 fatty acids, which can support heart health and contribute to satiety. A great option for balanced meals,” she says. And at Costco, you’ll save big by buying it in bulk.
Kirkland Almond Flour


If you love baking, consider Kirkland Almond Flour. “Lower in carbs than traditional flour and contains healthy fats and fiber, but it’s still high in calories, so it’s not inherently ‘weight loss friendly’ unless portions are controlled,” says Collingwood.
Roast chicken


Many shoppers buy more than one supposedly inexpensive $5 rotisserie chicken from Costco. “A convenient, protein-rich option that can make meal preparation easier. Removing the skin can reduce saturated fat and calories when needed,” she says.
Kirkland Frozen Organic Berries


Another product that most health experts buy, especially to add to protein shakes and smoothies? Frozen organic berries from Kirkland. “High in fiber and antioxidants, with no added sugar. Fiber helps control satiety and blood sugar, making it great for weight management,” she says.
Kirkland Boneless Chicken Breast


And Kirkland Boneless, Skinless Chicken Breast has been a warehouse bestseller for decades. “A staple lean protein, high in protein, low in fat and very versatile. Promotes satiety and muscle maintenance,” she says.
Kirkland Nut


Kirkland walnuts are one of the most popular nuts. “Contains heart-healthy fats and fiber, which can help with satiety. Like all nuts, they are nutritious but high in calories, so knowing portion sizes is essential,” says Collingwood.
Season Brand Sardine Fillets


Season brand sardine fillets are another heart-healthy option. “Packed with protein, omega-3 and calcium (especially if bones are included). Very nutrient dense and satisfying,” 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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