A doctor who claims to have reversed his 'biological age' by 20 years shares his favorite Costco items

• Dr. Mark Hyman says he has reversed his "biological age" to 43 from 63.
• He says problems associated with aging can be reduced through healthy lifestyle choices.

Dr. Mark Hyman, a 63-year-old physician who says his "biological age" is 43, has shared his favorite Costco items.

Hyman previously told Insider that he wasn't against aging but wanted to age better, and that problems such as achy joints and foggy thinking were not inevitable and could be prevented by longevity strategies such as good nutrition and exercise.

For example, he starts his day with 30 minutes of strength training and a morning smoothie full of nutrients, healthy fats, and 48 grams of protein.

The concept of "biological age" and whether it can be reversed is disputed among the medical community. Experts are, however, starting to agree on the idea that it's possible for people to have different biological and chronological ages.

Writing on his blog on Monday, Hyman said, "Costco can be a great place to buy healthy food on a budget," as long as you read product labels to "find clean options."

With the exception of the fresh fruits and vegetables available, Hyman shared a list of his go-to healthy items from Costco. He noted that Costco requires a membership card and that available items might vary depending on location.

Nuts and almond butter

Hyman listed a range of unseasoned nuts, including pistachios, pecans, and walnuts, as well as a creamy almond butter.

Nuts are a good source of healthy fats, and Hyman previously wrote on Instagram that he included almond butter or nuts in his smoothies because they "keep you energized, full, and focused."

• Kirkland Signature In-Shell Pistachios

• Kirkland Signature Dry Roasted Macadamia Nuts

• Kirkland Signature Supreme Whole Almonds

• Kirkland Signature Pecan Halves

• Kirkland Signature Walnut Halves

• Kirkland Creamy Almond Butter

Frozen fruit and vegetables

• Kirkland Signature Organic Blueberries

• Organic Riced Cauliflower

• Kirkland Signature Organic Strawberries

Flour and grains

• Kirkland Signature Almond Flour

• Kirkland Signature Organic Quinoa

Snacks

• Simple Mills Almond Flour Sea Salt Crackers

• Chomps Original Beef Sticks, Mild

• That's it Mini Fruit Bars

• Unreal Dark Chocolate Coconut Minis

Oils, fats, and syrup

Hyman said you should buy oil in a glass bottle rather than plastic if possible. Samantha Radford, an exposure scientist and researcher at Saint Francis University, previously told Insider that avoiding products with plastic containers and opting for those made from glass or stainless steel can prevent exposure to what are known as endocrine disruptors, including bisphenol A.

• Kirkland Signature Extra Virgin Italian Olive Oil

• Chosen Foods 100% Pure Avocado Oil

• Kirkland Signature Organic Virgin Coconut Oil

• Kirkland Signature Grass-Fed Butter, Salted

• Kirkland Signature Organic Pure Maple Syrup

Tinned seafood

• Season Skinless & Boneless Sardines In Olive Oil

• Kirkland Signature Wild Alaskan Pink Salmon

Fermented goods

• Wildbrine Raw Organic Sauerkraut

• Kirkland Signature Organic Greek Nonfat Yogurt, Plain

• Jongga Kimchi Sliced Napa Cabbage