What are the symptoms of zinc deficiency in the body?
Persistent fatigue, hair loss, recurring infections, damaged skin, brittle nails? It's not that easy to identify: each of these signs, taken alone, can suggest stress, lack of sleep, or another deficiency. But when they appear together, it's possible that it's linked to a drop in zinc levels in the body (hypozincemia).
What is the role of zinc in the body?
Before discussing the symptoms of zinc deficiency, it is useful to understand why this mineral is essential for our nutrition and the proper functioning of the body.
Essential roles of zinc
Although it is available in small quantities in the body, zinc is involved in many enzymatic and biological reactions.
It is particularly involved in protein synthesis, DNA replication, and cell renewal.
This trace element also contributes to the functioning of the immune system, hormonal regulation, and the maintenance of cognitive abilities.
It also plays an important role in the health of skin, hair, and nails, as well as in the perception of taste and smell.
Discover our guide on zinc, its benefits, roles, and importance for health.
Key figure: Over 300 enzymes depend on zinc to function.
The main symptoms of zinc deficiency
A zinc deficiency can manifest in very different ways depending on the person and the severity of the deficiency.
Frequent physical symptoms
A lack of zinc can contribute, among other factors, to persistent fatigue and a decrease in muscle capacity due to its involvement in energy metabolism (Tardy et al., 2020). If you suffer from persistent fatigue associated with other suggestive signs, a zinc deficiency may be one of the causes to explore with your doctor.
Skin symptoms
Insufficient zinc in the body can disrupt both the protective barrier of your skin and its ability to regenerate.
Thickening and dry skin, slow healing, irritations, or persistent lesions are often among the first warning signs.
In some cases of more pronounced deficiency, more significant skin symptoms, such as dermatitis, may be observed.
Hair loss and nail degradation (white spots, fragility, ridges) are also frequently reported signs in consultations.
Key figure: Approximately 5% of total body zinc is concentrated in the skin, primarily in the epidermis.
Immune symptoms
Zinc is involved at several levels of the immune response according to Prasad's work (1998). This is why a deficiency can weaken your immune defenses and promote more frequent infections (colds, bronchitis, ear infections, skin problems, gastrointestinal disorders, etc.). Furthermore, during periods of intense stress or prolonged effort, you may observe increased vulnerability to infectious agents.
Neurological and sensory symptoms
Li et al. (2022) report that zinc deficiency is associated with several neurological alterations, including cognitive disorders (lack of concentration) and emotional disorders.
Do you no longer perceive certain odors and your dishes seem to have lost all flavor? Taste and smell alteration disorders are among the symptoms frequently associated with zinc deficiency. A deficiency could impact the cellular renewal of sensory receptors involved in taste and smell.
According to epidemiological data reported in the systematic review by Mozaffar et al. (2023), zinc deficiency represents the second most frequent cause of taste disorders (14.5% of recorded cases).
How to recognize a zinc deficiency?
Recognizing a zinc deficiency is not just about checking off a list of symptoms. It is a global approach that combines context, clinical signs, and a complete medical evaluation.
Warning signs not to ignore
The accumulation of several symptoms (persistent fatigue, brittle hair, frequent infections, altered taste) should alert you. A single isolated sign is not always enough to suggest a deficiency: it is their simultaneous association that should point to zinc deficiency.
Medical diagnosis
Serum zinc measurement is the most commonly used biological test to assess zinc status, although its sensitivity sometimes appears limited. The blood sample must be taken on an empty stomach, preferably in the morning.
Reference values in adults are generally between 80 and 120 µg/dL. Below 70 µg/dL, zinc deficiency is clinically proven.
Only a doctor can interpret your results based on the overall clinical context: symptoms, medical history, and the patient's dietary profile.
Warning: circulating zinc in blood serum represents only 0.1% of the total zinc in the body, the rest being stored in tissues.
A zinc deficiency is sometimes accompanied by a magnesium deficiency. Discover why combining the two minerals can be relevant.
What are the causes of zinc deficiency?
A zinc deficiency rarely occurs by chance. It most often results from one or more combined factors.
Insufficient dietary intake
Excess of certain compounds limits zinc absorption regardless of your intake. These are phytates found in legumes, seeds, soy, and whole grains. They bind to zinc and decrease its bioavailability.
To a lesser extent, a high consumption of oxalates, calcium, or casein can also produce the same inhibitory effect.
You are also exposed to insufficient zinc intake in the following cases:
- poorly balanced vegetarian or vegan diet;
- unvaried or highly refined diet;
-
low consumption of red meat and seafood.
Poor intestinal absorption
Certain pathologies such as Crohn's disease or celiac disease can reduce your intestine's ability to properly absorb zinc.
Other conditions, particularly hepatic cirrhosis or renal failure, are also associated with a high risk of zinc deficiency.
The same applies to prolonged use of certain medications such as diuretics and chronic excessive alcohol consumption.
Increased needs
Certain physiological situations increase the body's need for zinc. Pregnancy and breastfeeding are among them. According to a cohort study published in Scientific Reports, zinc deficiency in a pregnant woman multiplies the risk of low birth weight by 3.4 (Wang et al., 2015).
Regular intensive sports activity or endurance sports, as well as rapid growth in children, also increase zinc needs.
Who is most at risk of zinc deficiency?
Who is most likely to suffer from a lack of zinc?
Vegetarians and vegans: the absence of animal proteins and high consumption of phytates hinder zinc assimilation.
Pregnant or breastfeeding women: their nutritional needs increase sharply to ensure fetal development and milk production.
Elderly people: often affected by decreased food intake (loss of appetite) and poorer intestinal absorption.
People suffering from chronic intestinal diseases (Crohn's, celiac disease): these pathologies directly impair nutrient assimilation.
Infants over 6 months and young children: breast milk is no longer enough to cover increasing needs, and dietary diversification is not always optimal.
High-level athletes: intense and repeated sweating leads to losses of minerals.
How to correct a zinc deficiency?
To reverse the trend, targeted consumption of zinc-rich foods remains the absolute priority. However, if intake remains insufficient to cover needs, supplementation with quality food supplements provides reinforcement.
Adjusting your diet
To quickly compensate for the deficiency, you should focus on foods naturally rich in zinc. Here are the best sources to prioritize:
- Oysters and shellfish: these are the foods most concentrated in zinc;
- Red meats (beef, lamb) and offal (calf's liver);
- Legumes (lentils, chickpeas, beans);
- Seeds (pumpkin, sesame, sunflower) and cashews;
- Whole grain sourdough cereals, whose fermentation improves zinc bioavailability.
Practical tip: certain culinary techniques such as soaking, germination, or fermentation can improve the availability of zinc in plant-based foods.
Zinc supplementation
Supplementation should be based on the assimilation of suitable products. A course of treatment in the form of capsules or tablets is generally preferred. According to data from Baddam et al. (2025), doses should be adjusted according to the severity of the deficiency and must be determined by your doctor.
Warning: an excess of zinc can disrupt the absorption of copper and iron, especially in cases of prolonged intake or high doses. Any supplementation must be supervised by a healthcare professional. It is therefore strictly advised against self-prescribing large doses.
If you practice bodybuilding or an endurance sport, you can opt for supplements combining zinc and electrolytes, such as certain oral rehydration formulas.
The timing of intake is not insignificant for the effectiveness of your treatment: consult our dedicated guide to know when to take zinc and optimize its absorption.
How long does it take for symptoms to disappear?
Recovery depends on the severity of the deficiency. The most responsive symptoms, such as fatigue and altered taste, can improve within two to six weeks after appropriate correction.
Skin signs (healing, skin quality) and hair density normalize over a longer period, from two to six months.
In breastfed infants whose mother is deficient, correction through appropriate supplementation can yield results in a few weeks.
FAQ – Frequently Asked Questions
What are the symptoms of zinc deficiency?
Fatigue, hair loss, frequent infections, slow healing, loss of taste or smell, dermatitis or dry skin, brittle nails, and mood disorders can suggest a zinc deficiency.
Does zinc deficiency cause fatigue?
Yes. Zinc is a cofactor for enzymes involved in cellular energy production. A deficiency can contribute to persistent fatigue and reduced muscle capacity. These symptoms are not specific and can have other causes.
Can you be zinc deficient even with a good diet?
Yes. A zinc deficiency can occur even with a proper diet. Intake may be insufficient when the body's needs increase, for example during pregnancy, or when absorption is reduced due to digestive diseases or medication treatments.
How do you know if you have a zinc deficiency?
A blood test can assess zinc status, most often by measuring serum zinc, sometimes supplemented by erythrocyte zinc (measuring zinc in red blood cells). The sample is taken in the morning on an empty stomach and must be interpreted by a doctor.
How long does it take to correct a zinc deficiency?
Symptoms of a zinc deficiency can improve within a few weeks or take several months, depending on the severity and cause of the deficiency.
Clinical case and benefits after correction
A 66-year-old man consulted for intense fatigue and unexplained loss of appetite. Tests revealed severe iron deficiency anemia, resistant to usual treatments.
Further examinations revealed a long-standing alteration in taste. The patient gradually stopped eating, leading to severe malnutrition. His plasma zinc level was abnormally low.
Targeted zinc supplementation was initiated. Within a few weeks, the results were clear: taste returned, nutritional intake normalized, and the anemia resolved.
Regarding the benefits after correction, most patients report rapid improvement in their vitality after correcting a zinc deficiency. The most frequent feedback includes a boost of energy within a few weeks, disappearance of skin problems, and better resistance to winter infections.
In summary: key takeaways
A zinc deficiency can manifest in many ways and go unnoticed for a long time. Most symptoms are not very specific and can easily be attributed to stress, lack of sleep, or an iron, vitamin A, or vitamin D deficiency. However, when several signs appear simultaneously or persist over time, you can suspect a zinc deficiency, especially if you have associated risk factors.
If you experience several of these symptoms or if they persist despite a healthy lifestyle, it is recommended to consult a doctor to investigate the cause and, if necessary, perform appropriate biological tests.
Bibliography
Lin, P. H., Sermersheim, M., Li, H., Lee, P. H. U., Steinberg, S. M., & Ma, J. (2017). Zinc in Wound Healing Modulation. Nutrients, 10(1), 16. https://doi.org/10.3390/nu10010016
Hawrysz, Z., & Woźniacka, A. (2023). Zinc: an undervalued microelement in research and treatment. Postepy dermatologii i alergologii, 40(2), 208–214. https://doi.org/10.5114/ada.2023.127639
Baddam, S., Maxfield, L., Shukla, S., & Crane, J. S. (2025). Zinc Deficiency. In StatPearls. StatPearls Publishing. https://pubmed.ncbi.nlm.nih.gov/29630283/
Gooding, A. J., Packer, C. D., & Pensiero, A. L. (2019). Zinc Deficiency-induced Hypogeusia in a Patient with Refractory Iron-deficiency Anemia: A Case Report. Cureus, 11(12), e6365. https://doi.org/10.7759/cureus.636
Tardy, A.-L., Pouteau, E., Marquez, D., Yilmaz, C., & Scholey, A. (2020). Vitamins and minerals for energy, fatigue and cognition: A narrative review of the biochemical and clinical evidence. Nutrients, 12(1), 228. https://doi.org/10.3390/nu12010228
Shankar, A. H., & Prasad, A. S. (1998). Zinc and immune function: the biological basis of altered resistance to infection. The American journal of clinical nutrition, 68(2 Suppl), 447S–463S. https://doi.org/10.1093/ajcn/68.2.447S
Li, Z., Liu, Y., Wei, R., Yong, V. W., & Xue, M. (2022). The Important Role of Zinc in Neurological Diseases. Biomolecules, 13(1), 28. https://doi.org/10.3390/biom13010028
Mozaffar, B., Ardavani, A., Muzafar, H., & Idris, I. (2023). The Effectiveness of Zinc Supplementation in Taste Disorder Treatment: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Journal of nutrition and metabolism, 2023, 6711071. https://doi.org/10.1155/2023/6711071
Wang, H., Hu, Y. F., Hao, J. H., Chen, Y. H., Su, P. Y., Wang, Y., Yu, Z., Fu, L., Xu, Y. Y., Zhang, C., Tao, F. B., & Xu, D. X. (2015). Maternal zinc deficiency during pregnancy elevates the risks of fetal growth restriction: a population-based birth cohort study. Scientific reports, 5, 11262. https://doi.org/10.1038/srep11262