Eating This Nutrient Might Slow Down Biological Aging

As life expectancy rises in various parts of the globe, the idea of living a long and healthy life has become quite realistic. Genetics and lifestyle choices certainly play a significant role, but nutrition is a key factor that affects biological aging—this gradual damage to our cells and systems over time.

It might be tempting to hunt for that one “superfood” that can stall aging, but studies indicate that there’s no single food that can extend life expectancy, according to experts like Rachele Pojednic, Ph.D. “The strongest evidence leans towards holistic dietary patterns instead of individual foods,” she explains. “Diets filled with minimally processed items, sufficient protein, fiber-rich plants, and healthy fats are frequently linked to greater longevity.”

While your overall eating habits and lifestyle are crucial, protein does have a significant role in fostering healthy aging. It helps maintain muscle mass, bolsters the immune system, and aids cognitive function, making it an essential component of a diet geared towards a longer, healthier life.

To gain further insight into the importance of protein for aging, we consulted with registered dietitians and nutrition scientists to delve into the latest research and realistic strategies for increasing protein in our meals.

Measuring Biological Aging

Researchers evaluate how diet and nutrients like protein influence biological aging by examining both short-term food choices and their long-term effects. “In large population studies, scientists frequently track all-cause mortality, disease occurrence, or survival rates to pinpoint connections between nutrients and dietary patterns,” says Pojednic.

For shorter or mechanistic studies, they often use biomarkers related to biological aging, such as inflammation, insulin sensitivity, and lipid profiles. Pojednic also highlights that physical measures—like muscle strength and cardiometabolic health—are also critical indicators of aging, in addition to nutrition.

Why Protein Slows Biological Aging

Muscle Maintenance

As we age, muscle loss becomes increasingly significant, making protein intake a critical factor for healthy aging. According to Pojednic, “Adequate protein is vital for preserving muscle mass, insulin sensitivity, and resilience throughout the aging process.” Natural shifts in body composition, particularly in women, lead to a steady decline in muscle mass. Additionally, muscles may respond less effectively to exercise and diet, underscoring the need to prioritize protein intake as we get older.

Consuming enough protein, combined with a physically active lifestyle that includes strength training, is essential for maintaining muscle mass. This preservation supports balance, coordination, bone density, and metabolism, all of which contribute to independence and reduced chronic disease risk.

A lack of sufficient protein and physical inactivity can lead to age-related muscle loss, heightening the risks of frailty and sarcopenia—a condition marked by gradual reductions in muscle mass, strength, and function. Therefore, emphasizing both protein and strength training is key to sustaining physical function and metabolic health as we age.

Immune Function Support

One often underrated aspect of protein is its crucial role in immune health. Amino acids, the building blocks of protein, are vital in producing antibodies and cytokines, which are fundamental to the immune system. “Consider protein as the ‘maintenance crew’ for your body: it fixes cellular damage, bolsters immune functionality, and counteracts muscle loss associated with aging,” suggests Devon Golem, Ph.D.

However, merely eating protein isn’t sufficient for keeping the immune system in top shape. Other diet components, like antioxidant-rich fruits and vegetables, play a significant role in enhancing immune health.

Brain Benefits

A healthy brain is crucial for extending the years of good health—or healthspan. Proper nutrition, including adequate protein consumption, significantly impacts brain health and cognitive ability. Studies indicate that higher protein intake correlates with a lower risk of cognitive decline, while insufficient protein is associated with frailty and cognitive deterioration.

“As we grow older, our protein needs increase—around 1.0 to 1.2 grams of protein per kilogram of body weight daily,” states Golem. This increased intake supports muscle protein synthesis, which drops with age, helping to maintain metabolic health and physical function, both essential indicators of biological age.

Nutrient-Rich

While protein can be consumed separately through supplements, whole protein sources naturally contain other nutrients beneficial for health and longevity. For example, fish not only provides high-quality protein but also delivers omega-3 fats—healthy fats associated with improved biological aging. “Unsaturated fats, such as those from olive oil, nuts, seeds, and specific fish, contribute to slowing biological age,” notes Lindsey Schoenfeld, M.S.

Various other protein sources, like plant-based options and dairy, also bring valuable nutrients that combat biological aging, such as fiber and essential vitamins. “Protein is influential in slowing biological age, but its quality is of utmost importance,” emphasizes Schoenfeld. This stresses the need for a well-rounded diet over focusing solely on one nutrient.

Sources of Protein

• Fish: Fatty fish, like salmon and mackerel, are rich in omega-3 fatty acids, supporting overall health.
• Poultry and Red Meat: Chicken, turkey, pork, beef, and lamb are excellent protein sources. Opt for lean, minimally processed selections.
• Beans and Legumes: These fiber-rich foods are cost-effective sources of protein. Canned varieties are easy to incorporate into various meals.
• Nuts and Seeds: If fish isn’t your thing, consider incorporating omega-3-rich seeds like hemp, chia, or flax into your diet.
• Dairy: Milk, cheese, and yogurt provide protein alongside important nutrients like calcium. Fermented dairy, such as yogurt, can also provide probiotics that are beneficial for reducing inflammation.

Additional Nutrients to Consider

It’s rare that we consume isolated nutrients, making it important to consider our overall dietary patterns for promoting longevity. According to Pojednic, “Nutrients that promote metabolic health and mitigate chronic inflammation, like protein, omega-3 fatty acids, and fiber, consistently correlate with lower mortality rates and increased longevity.”

Here are some other nutrients to prioritize for healthier biological aging:

• Omega-3 Fatty Acids: “Unsaturated fats, particularly omega-3s from fatty fish, combat aging by reducing chronic inflammation and supporting cardiovascular health,” says Golem.
• Vitamin D: “Vitamin D has emerged as an essential nutrient for combatting aging,” shares Kelsey Kunik, RDN, noting that certain studies suggest vitamin D can slow DNA telomere loss.
• Fiber: “Fiber is important for digestive health as we age, and it provides prebiotics to support a healthy gut,” adds Shelley Balls, MD, RDN.
• Probiotics: Though not nutrients per se, probiotics are beneficial for health. “Aim for consuming probiotic-rich items a couple of times daily,” suggests Balls, emphasizing their potential roles in longevity and healthspan.

Our Perspective

Protein is essential for slowing down biological aging and supporting overall health. It’s tied to stronger muscles, enhanced brain function, and a more resilient immune system—all vital for longevity. However, looking at dietary patterns as a whole is crucial instead of zoning in on one nutrient. “There are various foods and nutrients that can help mitigate biological aging, but no single nutrient eclipses the others,” Kunik emphasizes.

In addition to a nutritious diet, other lifestyle choices like regular exercise, sufficient sleep, and stress management also contribute significantly to long-term health. “Nutrition alone can’t fundamentally slow biological aging without these other critical health factors working in harmony,” Pojednic concludes.