Mosquitoes' Appetite For Human Blood Is Increasing, And We Now Know Why, Thanks To A Brazilian Study

Mosquitoes’ Appetite For Human Blood Is Increasing, And We Now Know Why, Thanks To A Brazilian Study

Written by Romário Pereira de Carvalho

Published on 21/01/2026 at 15:13

Imagem: Reprodução

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Research In Atlantic Forest Reveals That Reduction Of Wild Hosts Leads Mosquitoes To Feed More On Humans, Increasing Risks Of Disease Transmission In Ecosystems Under Strong Environmental Pressure

Species of mosquitoes spread around the world are changing their feeding habits in response to biodiversity loss, increasingly feeding on human blood, according to a study conducted in Rio de Janeiro, which raises health risks in areas of growing environmental pressure.

A study led by scientists from the Federal Rural University of Rio de Janeiro and the Oswaldo Cruz Institute analyzed the origin of the blood ingested by mosquitoes in the Brazilian Atlantic Forest.

The results indicate that the reduction of wild hosts, caused by human presence and environmental changes, leads these insects to increasingly rely on humans as their main food source.

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Fieldwork In Fluminense Reserves

The investigation began with collections made in two preserved areas of the state of Rio de Janeiro, the Sítio Recanto Reserve and the Rio Guapiaçu Ecological Reserve, known as REGUA.

In these environments, the researchers captured 1,714 mosquitoes belonging to 52 different species, representing a broad sample of the existing local diversity in these areas.

Of the total collected, only 145 insects had the necessary profile for detailed analysis, being engorged females, that is, those that had recently fed on blood.

Genetic Analysis Of Ingested Blood

The blood present inside these females was subjected to genetic sequencing techniques to identify the source of the material ingested by the analyzed mosquitoes.

According to a statement, the scientists analyzed a specific gene that acts as a genetic barcode, allowing for the recognition of each vertebrate species involved.

The comparison of this code with databases made it possible to accurately determine which animal each mosquito had fed on previously.

Predominance Of Human Blood

The analysis revealed that, in 24 mosquitoes with identifiable genetic material, the blood came from 18 humans, one amphibian, six birds, one canid, and one rat.

Some insects had more than one stored food source, indicating that feeding may occur from different hosts over short periods.

For Jeronimo Alencar, author of the study, mosquito feeding behavior is complex and influenced not only by preference but also by availability.

Environmental Pressure And Insect Adaptation

With fewer natural options available, mosquitoes seek alternative blood sources, turning to humans for convenience, according to Sérgio Lisboa Machado in a statement.

Deforestation in the Atlantic Forest and urban expansion reduce the local fauna, forcing adaptations in habits even among disease vector insects.

This increased preference for human blood is seen as an additional indicator of biodiversity loss in ecosystems pressured by human activities.

Health Risks And Preventive Alert

In addition to the environmental impact, greater interaction between mosquitoes and humans raises health concerns due to the transmission of viral diseases such as yellow fever, dengue, zika, and chikungunya.

According to Alencar and Machado, understanding this trend is essential to guide public policies, epidemiological surveillance, and preventive actions in vulnerable regions.

The authors highlight that the phenomenon reinforces the need to preserve natural habitats, reducing ecological imbalances that ultimately reflect directly on human health.

With information from Galileu Magazine.

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Mosquitoes’ Appetite For Human Blood Is Increasing, And We Now Know Why, Thanks To A Brazilian Study

Research In Atlantic Forest Reveals That Reduction Of Wild Hosts Leads Mosquitoes To Feed More On Humans, Increasing Risks Of Disease Transmission In Ecosystems Under Strong Environmental Pressure

Fieldwork In Fluminense Reserves

Genetic Analysis Of Ingested Blood

Predominance Of Human Blood

Environmental Pressure And Insect Adaptation

Health Risks And Preventive Alert

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Mosquitoes’ Appetite For Human Blood Is Increasing, And We Now Know Why, Thanks To A Brazilian Study

Research In Atlantic Forest Reveals That Reduction Of Wild Hosts Leads Mosquitoes To Feed More On Humans, Increasing Risks Of Disease Transmission In Ecosystems Under Strong Environmental Pressure

Fieldwork In Fluminense Reserves

Genetic Analysis Of Ingested Blood

Predominance Of Human Blood

Environmental Pressure And Insect Adaptation

Health Risks And Preventive Alert

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Brazil will harvest a record crop of up to 357 million tons of grains, but it does not have the capacity to store a large part of it. The storage deficit has reached the highest level in history and is equivalent to almost the entire production of Argentina.

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