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American Focus > Blog > Tech and Science > Four Key Nutrients Are Shockingly Lacking in Over 60% of People’s Diets : ScienceAlert
Tech and Science

Four Key Nutrients Are Shockingly Lacking in Over 60% of People’s Diets : ScienceAlert

Last updated: September 4, 2024 10:45 pm
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Four Key Nutrients Are Shockingly Lacking in Over 60% of People’s Diets : ScienceAlert
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New Study Reveals Global Micronutrient Deficiencies

A recent study conducted by researchers from the Harvard TH Chan School of Public Health, the University of California, Santa Barbara (UCSB), and the Global Alliance for Improved Nutrition (GAIN) has shed light on a concerning issue: two-thirds of the world’s population are not meeting their daily requirements for four essential vitamins and minerals through their diet.

The study, which utilized data from the Global Dietary Database and advanced statistical models, analyzed the micronutrient levels in diets of 99.3 percent of the global population across 185 countries. The results were staggering, indicating widespread inadequacies in essential nutrients that are crucial for overall health and well-being.

“These findings are alarming,” expressed food scientist Ty Beal from GAIN. “The majority of individuals, across all regions and income levels, are failing to consume sufficient amounts of multiple vital micronutrients, which can have significant implications for health outcomes and human potential on a global scale.”

iodine deficiency global map
The researchers mapped nutrients across the globe, finding iodine deficiency in 68% of the population. Key guide up top right. (Passarelli et al., The Lancet Global Health, 2024)

Leading the list of deficiencies is iodine, with 68 percent of individuals not meeting the recommended intake. Iodine plays a crucial role in various bodily functions, including thyroid hormone production, heart health, brain development, and body weight regulation. Despite being abundant in seafood and dairy products, a significant portion of the global population is deficient in this essential nutrient.

map of vitamin e deficiency
The researchers mapped nutrients across the globe, finding vitamin E deficiency in 67% of the population. (Passarelli et al., The Lancet Global Health, 2024)

Additionally, vitamin E deficiency affects 67 percent of the global population, despite being present in foods like nuts, seeds, and eggs. Vitamin E is essential for cellular function, waste elimination, immune response, and overall health maintenance.

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global map of calcium deficiency
The researchers mapped nutrients across the globe, finding calcium deficiency in 66% of the population. (Passarelli et al., The Lancet Global Health, 2024)

Furthermore, calcium deficiency was identified in 66 percent of individuals, highlighting the importance of this mineral for bone health, muscle function, nerve signaling, and cardiac health. Despite being abundant in dairy products and leafy greens, a significant portion of the global population is not meeting their calcium requirements.


The researchers mapped nutrients across the globe, finding iron deficiency in 65% of the population. (Passarelli et al., The Lancet Global Health, 2024)

Iron deficiency, affecting 65 percent of individuals, poses serious health risks due to its role in oxygen transport, energy production, and overall well-being. Despite being present in foods like red meat, beans, and liver, a significant portion of the global population is not meeting their iron requirements.

It is important to note that the study did not account for supplement use or fortified foods, and some estimates were involved in the analysis. However, the comprehensive assessment provides valuable insights into potential dietary deficiencies across demographics.

The researchers hope that these findings will prompt policymakers and healthcare professionals to prioritize dietary interventions and education to address these widespread micronutrient deficiencies and improve global health outcomes.

“The public health challenge ahead of us is significant, but by identifying effective dietary strategies and targeting vulnerable populations, we can make a positive impact on global health,” stated Christopher Golden, an epidemiologist and ecologist at Harvard University.

The study has been published in The Lancet Global Health.

TAGGED:DietsKeyLackingNutrientsPeoplesScienceAlertShockingly
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