Declining pollination linked to major global health and economic losses

As wild pollinator populations slowly decline, researchers warn that the effects extend far beyond ecosystems — reaching human health and global food systems.

Based on 2020 crop yields, scientists estimate that the world produces 3 to 5 percent less fruit, vegetables, and nuts than it could if wild pollinator populations were healthy and stable.

According to new research led by Harvard T.H. Chan School of Public Health, this shortfall in pollination is associated with an estimated 427,000 premature deaths each year due to lower consumption of healthy foods and increased rates of diseases such as heart disease, stroke, diabetes, and certain cancers.

The study, published in Environmental Health Perspectives, is the first to quantify how declining wild pollinators may directly affect human health outcomes at a global scale.

Linking biodiversity loss to human health

Researchers say the study fills an important gap in understanding how environmental changes translate into medical and public health impacts.

“A critical missing piece in the biodiversity discussion has been a lack of direct linkages to human health,” said Samuel Myers, principal research scientist in the Department of Environmental Health and senior author of the study. “This research establishes that loss of pollinators is already impacting health on a scale with other global health risk factors.”

Wild pollinators — including bees, butterflies, and other insects — are essential for the production of roughly three-quarters of global crop types, particularly those that support healthy diets.

Why pollinators matter for food systems

The study highlights growing concerns over declining insect populations worldwide, sometimes referred to as an “insect apocalypse,” driven by habitat loss, pesticide use, and climate change.

Using a model based on data from hundreds of experimental farms across Asia, Africa, Europe, and Latin America, researchers estimated “pollinator yield gaps” — the difference between current crop production and what would be possible with healthy pollinator populations.

They then combined this agricultural data with global disease and risk models to estimate the resulting health and economic consequences across countries.

Uneven global impacts

The analysis found that reduced food production due to insufficient pollination was most pronounced in lower-income countries, where agricultural losses represented a significant share of total farm value.

However, the greatest health burden occurred in middle- and higher-income countries, where rates of non-communicable diseases linked to diet are higher.

Countries such as China, India, Indonesia, and Russia experienced some of the largest health impacts due to population size and dietary risk patterns.

In some lower-income regions, agricultural income losses from reduced pollination were estimated at 10 to 30 percent of total agricultural value.

“The results might seem surprising, but they reflect the complex dynamics of factors behind food systems and human populations around the world,” said co-author Timothy Sulser, senior scientist at the International Food Policy Research Institute. “Only with this type of interdisciplinary modeling can we get a better fix on the magnitude and impact of the problem.”

Why protecting pollinators matters

Researchers emphasize that safeguarding wild pollinators is not only an environmental issue, but also an economic and public health priority.

“This study shows that doing too little to help pollinators does not just harm nature, but human health as well,” said lead author Matthew Smith, a research scientist in the Department of Environmental Health.

The findings suggest that protecting biodiversity could play a key role in improving global nutrition and reducing chronic disease risk worldwide.

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