8 Costco Foods Linked to Healthy Aging

Most people head to Costco for the bulk deals and the free samples. But buried in those oversized aisles are a surprising number of foods that researchers and dietitians are linking to something far more valuable than savings.

A landmark study analyzed data from over 105,000 adults across 30 years and found that people who consistently ate whole, unprocessed foods were significantly more likely to reach older age free of chronic disease, with their physical function and mental clarity intact.

The foods on that list? Many of them are sitting right at your local Costco. Here is what to throw in that giant cart.

Wild Salmon

Wild-caught salmon is among the top choices when it comes to longevity-supporting fish, rich in omega-3 fatty acids and low in environmental contaminants. It is also a solid source of vitamin D, selenium, and choline, nutrients that are notoriously hard to get enough of from diet alone.

Costco carries wild-caught salmon in both fresh and frozen form, often at a price point that makes it realistic as a regular weeknight dinner rather than a special occasion splurge.

Kirkland Signature Extra Virgin Olive Oil

This Mediterranean diet staple is high in monounsaturated fatty acids, particularly oleic acid, as well as beneficial polyphenols. Many of its health benefits are thought to come directly from that polyphenol content and its antioxidant activity.

The Kirkland brand delivers healthy monounsaturated fat at a genuinely good price point. At roughly two liters per bottle, it is the kind of pantry staple that practically pays for itself.

Walnuts

Walnuts are a particularly smart choice among nuts for longevity. Researchers found that a one-ounce serving supported cardiovascular health and was linked to a longer lifespan, with projections of over a year of additional life expectancy in those who ate five or more servings per week compared to those who did not eat them at all.

They also support cognitive health, which makes the fact that they are available at Costco in large, affordable bags genuinely great news for your brain and your wallet.

Frozen Blueberries

Researchers recommend aiming for at least one cup of blueberries per day to get the full benefit, and a simple way to hit that goal is adding frozen blueberries to a smoothie or topping Greek yogurt with a drizzle of honey.

Costco’s organic frozen blueberry bags make hitting that daily cup effortlessly easy. Diets rich in fruits and vegetables were consistently linked to greater odds of healthy aging across all the domains measured in the Harvard-led study, including cognitive, physical, and mental health.

Kirkland Signature Organic Greek Yogurt

High daily intake of yogurt was associated with an increase in lifespan and better heart health, with gut health likely playing a central role in the connection. The recommendation is to choose varieties without added sugar and sweeten them yourself with fruit or a touch of honey.

Plain Greek-style yogurt specifically offers roughly twice the muscle-building protein of regular yogurt, tends to be lower in carbohydrates, and is a good source of calcium for bone, teeth, and heart health. Costco’s Kirkland Signature Organic Greek Yogurt checks every one of those boxes.

Green Tea

Among all types of tea, green tea has the highest concentration of EGCG, a powerful antioxidant polyphenol. Research has linked it to a longer lifespan, as well as healthier cellular activity, metabolic function, and both cardiovascular and cognitive health.

Costco regularly stocks large boxes of green tea bags at a fraction of the per-bag cost you would find at a standard grocery store. It is one of the easiest and most affordable upgrades you can make to your daily routine.

Mushrooms

Mushrooms are a source of beta-glucans, selenium, and crucial antioxidants including ergothioneine and glutathione. Research found that eating more mushrooms, especially in place of processed meat, was associated with a greater likelihood of living a longer life.

Costco carries large packs of fresh mushroom varieties that make it easy to hit the recommended four cups per week without making a separate grocery run. Throw them into stir-fries, soups, or omelets throughout the week.

Lentils

Legumes, including lentils and chickpeas, are high in fiber, plant protein, B vitamins, minerals, and phytonutrients. Research has linked higher legume intake with an increase in lifespan.

The Tasty Bite Organic Madras Lentils available at Costco are a standout pantry pick, delivering eight grams of fiber per serving and working just as well as a dip as they do as a side dish. For something that comes in a microwaveable pack, that is a genuinely impressive nutritional profile.

The good news is that eating for longevity does not have to mean shopping at expensive specialty stores or following a complicated protocol.

The Harvard-led research made clear that adhering to any one of the studied healthy dietary patterns, all of which centered on whole, unprocessed foods, was linked to better outcomes across every measure of healthy aging.

Costco, it turns out, might be one of the most underrated places to build exactly that kind of diet.

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