Zinc
Zinc is important for normal immune function; deficiency impairs immune response.
Why It Matters for Longevity
Zinc is important for normal immune function; deficiency impairs immune response. Zinc is an essential cofactor for over 300 enzymes, including those involved in immune cell development (T-cell differentiation, natural killer cell activity), wound healing, and DNA repair. Deficiency leads to thymic atrophy and impaired adaptive immunity.. Zinc is listed alongside vitamin D as an important micronutrient for normal immune function, and alongside iron for immune support. Zinc and vitamin D synergistically support innate and adaptive immunity; both are required for cytokine regulation and pathogen defense. Zinc and iron together are critical for hematopoiesis and oxygen transport.. Longo recommends obtaining zinc through legumes, nuts, and seafood, supplemented via a multivitamin every 2–3 days. Zinc from animal sources (oysters, red meat) has superior bioavailability vs plant sources due to phytate chelation; diversity of sources and occasional supplementation ensures sufficiency on a plant-forward diet.. PMID 30949907: Meta-analysis of 28 trials found zinc supplementation significantly reduces the duration and severity of the common cold; supports the book's emphasis on zinc for immune resilience. (PubMed) PMID 25369925: Zinc supplementation in elderly subjects restored thymic function, improved T-cell counts, and reduced oxidative stress markers, demonstrating a direct anti-immunosenescence effect relevant to longevity. (PubMed)
How to Use It
Pairs well with oysters, pumpkin seeds, legumes. Use as a nutrient in your daily meals according to the Longevity Diet guidelines.
What to Pair It With
| Ingredient | Why | Tradition |
|---|---|---|
| oysters | See synergies | Highest food source: ~39–74 mg per 3 oz cooked |
| pumpkin seeds | See synergies | Plant source: ~2.9 mg per 28 g; top plant-based zinc food |
| legumes | See synergies | Lentils ~2.5 mg per 100 g cooked; chickpeas ~1.5 mg per 100 g cooked |
| wild rice | See synergies | ~1.3 mg per 100 g cooked |
Synergies
- Vitamin D (synergy): Both zinc and vitamin D are required for normal immune function; zinc supports T-cell activation while vitamin D modulates inflammatory cytokine production. Deficiency of either impairs immunity; co-supplementation is synergistic. - Iron (synergy): Zinc and iron are co-listed in the Longevity Diet as critical immune micronutrients; however, high-dose zinc supplementation (>50 mg/day) can competitively inhibit iron absorption — balance is important. - Pumpkin Seeds (complement): Pumpkin seeds are the most practical whole-food zinc source for plant-based diets; adding them to salads or grain bowls provides both zinc and magnesium.
Flavor Profile
Category: supplement/nutrient.
The Science
- PubMed: PMID 30949907: Meta-analysis of 28 trials found zinc supplementation significantly reduces the duration and severity of the common cold; supports the book's emphasis on zinc for immune resilience. - PubMed: PMID 25369925: Zinc supplementation in elderly subjects restored thymic function, improved T-cell counts, and reduced oxidative stress markers, demonstrating a direct anti-immunosenescence effect relevant to longevity. - PubMed: PMID 28181472: Zinc acts as an epigenetic regulator and DNA damage response activator; inadequate zinc status is associated with increased genomic instability, a hallmark of aging — extending the longevity relevance beyond immunology. - Examine.com: Examine confirms that zinc picolinate and zinc gluconate have superior bioavailability to zinc oxide; optimal supplemental dose is 25–45 mg/day; chronic high doses (>100 mg/day) can impair copper absorption. - Book claim (high confidence): Zinc is important for normal immune function; deficiency impairs immune response. - Book claim (high confidence): Zinc is listed alongside vitamin D as an important micronutrient for normal immune function, and alongside iron for immu
Key Nutrients
| Nutrient | Per 100g | Notes |
|---|---|---|
| Zinc (elemental) | N/A — supplement form | From food: bioavailability from animal sources is ~40–50%; from plant sources ~15–26% due to phytate inhibition. Zinc picolinate and gluconate are most bioavailable supplemental forms. |
| Zinc-dependent enzymes | N/A | Zinc is a structural and catalytic component of >300 enzymes including superoxide dismutase (antioxidant), RNA polymerase (gene expression), and matrix metalloproteinases (tissue remodeling). |