The Healthspan Map · Nutrient
Zinc
Compiled by Aamir Malik, PhD, Professor of Neuroengineering at Brno University of Technology, from published studies. He is a researcher, not a physician. Last updated 21 August 2026.
Linked to getting too little
| Condition or system | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| Anemia | Eat enough of | Emerging | Review / narrative | Zinc deficiency is associated with anemia in some populations. | Zinc & anemia (opens in a new tab) |
| Anxiety | Eat enough of | Emerging | RCT / trial | Zinc deficiency is associated with anxiety; zinc repletion may ease symptoms. | Trace-minerals & anxiety review 2023; zinc RCT (elderly) (opens in a new tab) |
| Brain fog & memory | Eat enough of | Moderate | Established clinical | In older adults, deficiency causes problems with thinking, reasoning and memory. | NIH ODS – Zinc (opens in a new tab) |
| Chronic fatigue / low energy | Eat enough of | Emerging | Review / narrative | Zinc participates in energy metabolism and immunity; deficiency can present with fatigue. | Micronutrients for energy/fatigue review (Tardy 2020) (opens in a new tab) |
| Depression / low mood | Eat enough of | Moderate | RCT / meta-analysis | Depression is associated with lower serum zinc; zinc supplementation reduces depressive symptoms (SMD -0.36). | Swardfager et al. 2013; zinc supplementation meta 2021 (opens in a new tab) |
| Depression / low mood | Eat enough of | Moderate | RCT / meta-analysis | Depression is associated with lower serum zinc; zinc supplementation reduces depressive symptoms (SMD -0.36). | Swardfager et al., "Zinc in depression: a meta-analysis", Biol Psychiatry 2013 (opens in a new tab) |
| Insomnia / poor sleep | Eat enough of | Moderate | Cohort / observational | Zinc activates the AANAT enzyme (serotonin to melatonin); higher serum zinc is linked to less sleep disturbance. | AANAT literature; NHANES 2011-2016 (opens in a new tab) |
| Muscle & joint pain / weakness | Eat enough of | Emerging | Systematic review | Zinc supports muscle repair and protein metabolism; low intake is associated with poorer muscle performance. | Nutritional supplements & sarcopenia (opens in a new tab) |
| Reproductive & sexual health | Eat enough of | Strong | RCT / meta-analysis | Zinc is critical for sperm production and testosterone; in asthenospermic men, zinc supplementation increased sperm volume, motility and total count. | Impact of food & nutraceuticals on fertility (ScienceDirect 2025) (opens in a new tab) |
| Respiratory infections & airway health | Eat enough of | Moderate | RCT / meta-analysis | Low zinc status raises respiratory-infection/pneumonia risk; zinc lozenges shortened cold duration by ~2.25 days. | Zinc supplementation & common-cold duration (PMC7356429) (opens in a new tab) |
| Skin, hair, nails & wound healing | Eat enough of | Strong | Established clinical | Zinc deficiency causes dermatitis (acrodermatitis enteropathica), alopecia and impaired wound healing. | Zinc & skin/wound healing (opens in a new tab) |
| Stress | Eat enough of | Emerging | Systematic review | Zinc is part of the reviewed mineral battery for stress; it supports HPA-axis and GABAergic regulation. | EFA/B-vitamin/mineral stress review (McCabe et al. 2017) (opens in a new tab) |
| Thyroid dysfunction | Eat enough of | Moderate | Review / narrative | Zinc is required for thyroid hormone production and T3-receptor function; deficiency impairs thyroid metabolism. | Minerals & thyroid review (PMC7574993) (opens in a new tab) |
| Tinnitus | Eat enough of | Moderate | Cohort / observational | Lower zinc intake was linked to a 44% higher 10-year tinnitus incidence; the cochlea concentrates zinc. | Zinc & tinnitus incidence (opens in a new tab) |
| Type 2 diabetes & metabolic syndrome | Eat enough of | Moderate | RCT / meta-analysis | Zinc supplementation improves glycemic markers (HbA1c, fasting glucose, insulin resistance); zinc stabilizes insulin and is anti-inflammatory. | Zinc & glycemic biomarkers meta (opens in a new tab) |
| Vision problems | Eat enough of | Moderate | RCT / meta-analysis | Zinc is a core AREDS ingredient supporting retinal antioxidant defense and slowing AMD progression. | AREDS formula review (PMC7015456) (opens in a new tab) |
| Weak immunity & chronic inflammation | Eat enough of | Moderate | Review / narrative | Zinc is essential for immune-cell development and barrier integrity; deficiency impairs immunity and zinc shortens the common cold. | Zinc & immunity (opens in a new tab) |
| Eyes & Special Senses | Eat enough of | Strong | Established clinical | Zinc deficiency at any age causes loss of taste and smell, and (with vitamin A) impaired night vision. | NIH ODS – Zinc (opens in a new tab) |
| Reproductive & Developmental | Eat enough of | Strong | Established clinical | Deficiency causes growth retardation, delayed sexual maturation and, in pregnancy, preterm birth and low birth weight. | NIH ODS – Zinc (opens in a new tab) |
Linked to getting too much
| Condition or system | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| Anemia | Don't overdo | Emerging | Mechanistic | Excess zinc induces copper deficiency, which causes anemia. | Zinc excess -> copper-deficiency anemia (opens in a new tab) |
| Digestive discomfort | Don't overdo | Moderate | Established clinical | High-dose zinc causes nausea, vomiting and GI upset. | NIH Office of Dietary Supplements — Zinc (opens in a new tab) |
| Peripheral neuropathy | Don't overdo | Moderate | Review / narrative | Excess zinc (high-dose supplements, denture creams) depletes copper and causes a reversible myeloneuropathy. | Zinc-induced copper deficiency (opens in a new tab) |
| Reproductive & sexual health | Don't overdo | Emerging | Review / narrative | Excess zinc can induce copper deficiency and, as antioxidant over-supplementation, may impair rather than help sperm function. | Dietary antioxidants & male infertility – antioxidant paradox (PMC8003818) (opens in a new tab) |
| Respiratory infections & airway health | Don't overdo | Emerging | RCT / meta-analysis | Excess zinc can impair immune function and induce copper deficiency, offsetting benefits — more is not better. | Zinc supplementation & common cold (PMC7356429) (opens in a new tab) |
| Skin, hair, nails & wound healing | Don't overdo | Emerging | Established clinical | Zinc above ~40 mg/day can disrupt hair follicles and induce copper deficiency (itself a cause of hair/skin changes). | NIH Office of Dietary Supplements — Zinc (opens in a new tab) |
| Weak immunity & chronic inflammation | Don't overdo | Emerging | Established clinical | Chronically high zinc impairs immune function and induces copper deficiency. | Excess zinc & immunity (opens in a new tab) |
The Healthspan Map is part of Fix the Floor, a book by Aamir Malik. About the book