Zinc deficiency is a nutrition concern worldwide, especially in parts of South Asia and sub-Saharan Africa. A 2024 global analysis estimated that about 15% of people—around 1.13 billion—may not get enough zinc from the food supply. This is an estimate of inadequate intake, not a count of people with confirmed deficiency. Rates differ by country, age, diet, health conditions, and how zinc status is measured.
What Do Global Estimates Show?
Zinc deficiency is more common in some parts of the world than others. Researchers publishing in Nature Food in 2024 analyzed national food-supply data and existing food-fortification programs to estimate how many people may not receive enough dietary zinc. Their analysis estimated that approximately 15% of the global population, or 1.13 billion people, had inadequate zinc intake under the food-supply model that accounted for existing fortification programs.
The estimated rates varied considerably by region. South Asia had an estimated prevalence of inadequate zinc intake of 27%, while southern and tropical Latin America had an estimated rate of 6%. South Asia accounted for 43% of the people estimated to have inadequate zinc intake worldwide.
These figures describe the estimated risk of insufficient intake at a population level. They do not mean that every person in an affected region has a confirmed deficiency. The estimates also depend on the zinc available in national food supplies, how much the body can absorb, and the assumptions used in the analysis.
How Common Is Zinc Deficiency in India?
Research in India has identified low serum zinc concentrations among children and adolescents, although the percentages differ by age group. A study published in the American Journal of Clinical Nutrition examined data from India's Comprehensive National Nutrition Survey, conducted between 2016 and 2018.
The researchers reported the following prevalence of low serum zinc concentrations among children and adolescents:
- Preschool children aged 1–4 years: 17.4%.
- School-age children aged 5–9 years: 15.8%.
- Adolescents aged 10–19 years: 31.1%.
These results show that low serum zinc concentrations were more common among adolescents than among younger children in this survey. However, the figures apply to the age groups studied, not to the entire Indian population. The researchers also found that estimates could change depending on fasting status and the zinc concentration cutoffs used to classify participants.
How Common Is Zinc Deficiency in the United States?
Zinc deficiency appears less common in the United States than in many low- and middle-income countries. According to the National Institutes of Health Office of Dietary Supplements, most people in the United States obtain adequate amounts of zinc, although some groups may have lower intakes.
An analysis of US National Health and Nutrition Examination Survey data collected between 2011 and 2014 found serum zinc concentrations below the study's sufficiency cutoff in 3.8% of children younger than 10 years, 8.6% of males aged 10 years and older, and 8.2% of females. These figures describe low blood zinc concentrations according to the study's criteria. They should not be interpreted as exact rates of clinically diagnosed zinc deficiency, and they do not represent current measurements.
Which Groups Are More Likely to Have Zinc Deficiency?
Not everyone has the same likelihood of developing zinc deficiency. According to the Merck Manual, dietary zinc deficiency is unlikely in otherwise healthy people with adequate nutrition, but deficiency can develop when intake is insufficient, absorption is impaired, or other health conditions affect zinc balance.
The NIH Office of Dietary Supplements identifies several groups that may be more likely to have inadequate zinc status:
- People with digestive disorders: Conditions such as Crohn's disease and other disorders that affect nutrient absorption can increase the risk of zinc deficiency. People who have undergone certain types of weight-loss surgery may also be at risk.
- People with limited dietary zinc: Individuals with poor overall food intake or diets that provide too little absorbable zinc may not meet their nutritional needs. Plant foods such as beans and whole grains contain zinc, but phytates in these foods can reduce its absorption.
- People who are pregnant or breastfeeding: Zinc requirements increase during these life stages, making adequate intake important.
- Older adults: Some older adults have lower dietary zinc intakes, particularly when appetite, food choices, or access to nutritious meals is limited.
- People with alcohol use disorder: Alcohol use can affect zinc absorption and urinary zinc loss, while poor overall nutrition may further increase the risk of inadequate intake.
- Infants and children with specific nutritional or medical needs: Infants older than six months who rely exclusively on breast milk without appropriate complementary foods may not receive enough zinc. Children with sickle cell disease are also a recognized higher-risk group.
Having one of these risk factors does not automatically mean that someone has zinc deficiency. Risk depends on the person's actual intake, absorption, health status, and nutritional requirements.
Why Is It Difficult to Measure Zinc Deficiency Worldwide?
There is no single worldwide count based on testing every individual. Researchers use different approaches, including estimates of zinc intake from food supplies and surveys that measure zinc concentrations in blood. These methods answer related but different questions: food-supply estimates indicate where dietary intake may be inadequate, while blood measurements provide information about zinc status among the people tested.
The NIH Office of Dietary Supplements explains that serum or plasma zinc concentrations are commonly used to assess zinc status, but they have limitations. Results can be affected by age, sex, the time of day the blood is collected, infections, and illness. Blood zinc levels also do not always correspond directly to zinc intake.
These limitations help explain why different surveys may report different prevalence figures, even when they study the same country or broadly similar populations. Reliable estimates depend on the population selected, the timing and methods of measurement, and the criteria used to define inadequate zinc status.
Does a High Prevalence Estimate Mean You Have Zinc Deficiency?
No. A population estimate describes a group of people, not an individual's nutritional status. Someone living in a region where zinc deficiency is common may have an adequate intake, while a person in a region with a lower estimated prevalence may still have difficulty obtaining or absorbing enough zinc.
Possible features of zinc deficiency include slow wound healing, hair loss, reduced appetite, changes in taste or smell, frequent infections, and impaired growth in children. However, these features can also occur with other health conditions and do not establish zinc deficiency on their own.
If symptoms persist, worsen, or interfere with daily life, or if you have a digestive condition that may affect nutrient absorption, a healthcare professional can assess the situation. Evaluation may include a review of your diet and medical history, a physical examination, and appropriate laboratory testing when indicated. Results should be interpreted in the context of your overall health rather than a population statistic alone.
What Do These Numbers Mean for Public Health?
The available evidence suggests that inadequate zinc intake remains a meaningful global nutrition concern, with a greater estimated burden in some regions than in others. Differences in diet, nutrient absorption, food availability, and access to fortified foods can contribute to these patterns.
Population estimates help health authorities identify communities that may benefit from nutrition surveys, improved dietary access, or appropriate food-fortification programs. They also highlight the importance of collecting reliable data across different age groups. For individuals, however, the relevant question is whether their own nutritional needs are being met, which cannot be determined from worldwide or regional prevalence figures alone.