Question explored with the scientific record
does zinc prevent aris in children
The short version: zinc likely shortens colds and cuts their frequency in well-nourished children, but the effect on ARI (acute respiratory infections) in the general population is small and inconsistent.
The strongest evidence for prevention of common colds in children shows a meaningful drop in incidence — about 382 colds per 1,000 child-days on zinc versus 618 on placebo [23]. A 2014 systematic review of preventive zinc in children found a small 11% reduction in diarrhea but no significant effect on respiratory infections overall [20].
The 2023 Pakistan trial in infants with ARI [1] is the only direct evidence for the exact question you asked. It found a borderline 11% reduction in ARI episodes per child-year (incidence rate ratio 0.89, 95% CI 0.79–1.01 — the confidence interval just touches 1.0, meaning the result is not statistically significant at the usual level). It did shorten illness: about 11 days with symptoms on zinc versus 15 days on placebo.
| Outcome | Zinc group | Control group | Effect |
|---|---|---|---|
| ARI episodes per child-year | 7.78 | 8.68 | 11% reduction (not significant) |
| Days with ARI | 11.2 | 14.6 | 3.4 fewer days |
| ARI duration per episode | 3.5 days | 3.7 days | Similar |
The downsides: zinc causes more nausea and bad taste — about 56% of people on zinc reported side effects versus 48% on placebo [23]. And the evidence comes almost entirely from developing-country populations with borderline zinc status; whether the benefit holds for well-nourished children in wealthy countries is not tested by any trial in this evidence set.
My call: for a child in a setting where zinc deficiency is common, a short course at the start of a cold is worth trying, but I do not see convincing evidence for routine daily prevention of all ARIs. The effect on ARI incidence specifically is weak, statistically borderline, and absent from the larger systematic review. Confidence: moderate for shortening colds; low for preventing ARIs in well-nourished children.
Sources used 24
-
A Randomized Controlled Trial on Zinc Supplementation for Prevention of Acute Respiratory Infections in Infants
Zinc supplementation in Pakistani infants with acute respiratory infections shortened illness duration and raised serum zinc levels, with inconclusive or variable effects on ARI incidence.
DOI: 10.54393/pjhs.v4i04.696 -
Simultaneous Weekly Supplementation of Iron and Zinc Is Associated with Lower Morbidity Due to Diarrhea and Acute Lower Respiratory Infection in Bangladeshi Infants
This study evaluates the efficacy of simultaneous weekly supplementation of iron and zinc on reducing morbidity from diarrhea and acute lower respiratory infections in Bangladeshi infants, finding that such supplementation is associated with lower risks of these conditions, part…
DOI: 10.1093/jn/133.12.4150 -
Therapeutic and preventive effects of zinc on serious childhood infectious diseases in developing countries
This study reviews the therapeutic and preventive effects of zinc supplementation on diarrhea and other serious infectious diseases in children from developing countries, highlighting significant reductions in illness duration and incidence.
DOI: 10.1093/ajcn/68.2.476s -
Early Outpatient Treatment of Symptomatic, High-Risk COVID-19 Patients That Should Be Ramped Up Immediately as Key to the Pandemic Crisis
This review argues that hydroxychloroquine plus azithromycin or doxycycline, preferably with zinc, is safe and effective as early outpatient treatment for high-risk COVID-19 patients, citing non-randomized and observational evidence to prevent hospitalization.
DOI: 10.1093/aje/kwaa093 -
Zinc Nutritional Status of Morbidly Obese Patients Before and After Roux-en-Y Gastric Bypass: A Preliminary Report
This study investigates the impact of Roux-en-Y gastric bypass surgery on the zinc nutritional status of morbidly obese patients, revealing significant changes in plasma, erythrocyte, and urinary zinc concentrations before and after the procedure.
DOI: 10.1381/096089206776327305 -
Zinc Nutritional Status in Obese Children and Adolescents
This study evaluates the zinc nutritional status in obese children and adolescents, revealing significantly lower plasma and erythrocyte zinc concentrations and higher urinary zinc excretion compared to a control group.
DOI: 10.1385/BTER:86:2:107 -
Nutritional and Zinc Status of Head and Neck Cancer Patients: An Interpretive Review
This interpretive review examines the nutritional and zinc status of head and neck cancer patients, highlighting the significant impact of zinc deficiency on immune function and treatment outcomes.
DOI: 10.1080/07315724.1998.10718787 -
Changes in plasma zinc content after exercise in men fed a low-zinc diet
This study investigates the effects of dietary zinc intake on plasma zinc levels in healthy men during exercise, revealing that zinc mobilization from tissues is impaired during zinc depletion and validating the van Beaumont quotient as an index of body zinc stores.
DOI: 10.1152/ajpendo.1984.247.1.e88 -
Iron, Copper, Magnesium and Zinc Status as Predictors of Swimming Performance
This study evaluates whether blood-based trace mineral status (iron, copper, magnesium, zinc) and their dietary intakes can accurately predict 100-yard freestyle swimming performance in ten collegiate swimmers, finding highly accurate predictions (r = 0.97) and equal performance…
DOI: 10.1055/s-2007-972891 -
Impact of rice fortified with iron, zinc, thiamine and folic acid on laboratory measurements of nutritional status of preschool children
This study evaluates the impact of iron, zinc, thiamine, and folic acid-fortified rice (Ultra Rice®) on the nutritional status of preschool children, demonstrating significant improvements in micronutrient levels and dietary intake among participants.
DOI: 10.1590/1413-81232017222.17322016 -
Effect of End-Stage Renal Disease and Diabetes on Zinc and Copper Status
This study investigates the nutritional status of zinc and copper in patients with end-stage renal disease undergoing hemodialysis, comparing those with type 2 diabetes to nondiabetic patients and healthy controls, revealing significant differences in plasma and erythrocyte zinc…
DOI: 10.1385/bter:112:1:1 -
Zinc status in human immunodeficiency virus infection
This study investigates plasma and erythrocyte zinc and copper concentrations, as well as superoxide dismutase activity in individuals with HIV infection, finding no significant zinc deficiency associated with HIV, but elevated plasma copper levels in AIDS patients.
DOI: 10.1016/0024-3205(90)90397-a -
Assessment of mild zinc deficiency in children
The study evaluates zinc status and thymulin activity in Indian preschool children across nutritional categories, showing that mild zinc deficiency may be revealed by zinc-triggered restoration of thymulin activity while basal thymulin and zinc measures reflect only gross defici…
DOI: 10.1016/s0271-5317(05)80433-6 -
Impaired zinc and copper status in children with burn injuries: Need to reassess nutritional requirements
This study investigates the impaired zinc and copper status in children with burn injuries, revealing that despite high dietary intakes, plasma levels of these essential micronutrients remain low, indicating a need to reassess nutritional requirements for burned children.
DOI: 10.1016/j.burns.2005.04.026 -
Gut Microbiome Changes among Undernutrition and Stunting Infants and Children under 2 Years: A Scoping Review
Nutrition interventions in undernourished or stunted infants and toddlers under 2 years can modulate the gut microbiome and are associated with modest growth improvements, though micronutrient supplements without zinc may disrupt microbial communities, while zinc addition mitiga…
DOI: 10.2174/0118749445319116240729045056 -
Micronutrient deficiencies among children and women in Bangladesh: progress and challenges
This paper reviews the prevalence of micronutrient deficiencies among children and women in Bangladesh, highlighting significant ongoing challenges despite some progress in intervention programs.
DOI: 10.1017/jns.2016.39 -
The Effect of Balanced Nutritional Intake on Behavioral and Cognitive Outcomes in Individuals with Autism Spectrum Disorder
This study investigates whether a 12-week balanced nutritional intake intervention in children and adolescents with autism leads to improved behavioral and cognitive outcomes, improved nutrient status, and favorable changes in omega-3, zinc, and magnesium levels, with results sh…
DOI: 10.35335/healmed.v3i1.390 -
The Impact of Nutritional Interventions beyond the First 2 Years of Life on Linear Growth: A Systematic Review and Meta-Analysis
Zinc, vitamin A, multiple micronutrients, and protein interventions after age 24 months have positive effects on linear growth, while iron, calcium, iodine, and food-based interventions do not; baseline stunting is a strong predictor of effect.
DOI: 10.3945/an.116.013938 -
ORS Containing Zinc Does Not Reduce Duration or Stool Volume of Acute Diarrhea in Hospitalized Children
A double-masked randomized trial in hospitalized Indian children with acute diarrhea found that adding 40 mg/L elemental zinc to reduced-osmolarity ORS did not reduce total stool output or time to recovery compared with ORS alone, despite modest increases in serum zinc.
DOI: 10.1097/mpg.0b013e318213ca55 -
Preventive zinc supplementation for children, and the effect of additional iron: a systematic review and meta-analysis
This systematic review and meta-analysis evaluates the effects of preventive zinc supplementation on mortality and morbidity in children aged 6 months to 12 years, finding a small reduction in all-cause mortality and a potential decrease in diarrheal incidence, but no significan…
DOI: 10.1136/bmjopen-2013-004647 -
Child Feeding Practice and Primary Health Care as Major Correlates of Stunting and Underweight among 6- to 23-Month-Old Infants and Young Children in Food-Insecure Households in Ethiopia
Stunting and underweight are highly prevalent among 6–23-month-old children in food-insecure Ethiopian households and are strongly associated with older age (12–23 months), female sex, higher parity, poor dietary diversity, and missing zinc supplementation and iodized salt, unde…
DOI: 10.1093/cdn/nzaa137 -
Changing the zinc:iron ratio in a cereal-based nutritional supplement has no effect on percent absorption of iron and zinc in Sri Lankan children
This study tests whether altering the zinc to iron ratio in a cereal-based fortification (Thriposha) affects the fractional and total absorption of iron and zinc in healthy Sri Lankan children aged 4–7 years, finding no change in percent absorption but a significant decrease in …
DOI: 10.1017/s0007114509992728 -
Commentary on ‘Zinc for the common cold’
Commentary says zinc has some evidence of reducing common-cold duration and prophylactic incidence, but adverse events and uncertainty keep it from broadly recommending the treatment or prophylaxis.
DOI: 10.1002/ebch.1860 -
Micronutrients in childhood nutrition
Iron, vitamin A, and zinc deficiencies are major drivers of poor growth and immune function in early childhood, and interventions such as intermittent iron supplementation, vitamin A and zinc supplementation, and home fortification can reduce anemia, diarrhoeal morbidity, and mo…
DOI: 10.4038/sljch.v41i4.4976