A new study led by researchers at the University of Bristol has found that the loss of biodiversity is becoming a direct threat to human health and livelihoods. The research, published in the journal Nature, shows how declining insect pollinators are reducing food quality, harming nutrition and affecting farming incomes. Scientists have long known insects like bees, butterflies and other pollinators are very important for growing many fruits, vegetables and pulses. These foods give important vitamins and nutrients that are needed for healthy diets. However, until now there has been little clear evidence showing how pollinator decline directly affects people’s daily lives.
To understand the impact, researchers spent a year studying ten farming villages in Nepal. They tracked the insects visiting crops, the foods farmers produced, and what local families were eating. By following the link between pollinators, farming and nutrition, the team found that insect pollinators play a big role in supporting both people’s health and their income.
The study found that pollinators were responsible for nearly 44 per cent of farming income among the families involved. They also helped provide more than 20 percent of important nutrients in people’s diets, including vitamin A, folate, and vitamin E. These nutrients are essential for growth, strong immune systems and overall health.
Researchers warned that when pollinator numbers fall, farming families face serious risks. Lower crop yields and poor nutrition can lead to more illness and infections. This can affect health more seriously, especially in children. Families may also become trapped in deeper poverty because they earn less money from farming. Scientists described this as part of the global problem known as “hidden hunger“, where people may have enough food to eat but still lack important nutrients. Experts estimate that approximately one quarter of the world’s population suffers from hidden hunger.
The study also highlighted the dangers for children. Researchers found that more than half of the children involved in the Nepal study were shorter than expected for their age because of poor diets. Many of the foods that provide key nutrients depend heavily on insect pollination.
Without pollinators, children could lose access to important vitamins and proteins. These nutrients are needed for healthy growth and development. It may affect how well they grow and develop later in life, and their overall health is impacted too. Despite the concerns, researchers said the findings also show hope for improvement. They discovered that simple farming changes can help increase pollinator populations and improve people’s wellbeing at the same time.
Actions like planting wildflowers can help support pollination systems naturally. Reducing pesticide use also plays a big role in protecting insects. Another crucial step farmers can take is to protect native bee species. Scientists say these simple, low-cost changes could improve food security. They also can increase farming incomes, especially for smallholder farmers who are already vulnerable to climate change and biodiversity loss.
Around two billion people worldwide rely on small-scale farming for survival, making healthy ecosystems vital for global food supplies. Lead author Dr Thomas Timberlake said the research proves biodiversity is not simply about protecting nature for its own sake.
Instead, he said it was deeply connected to human health, nutrition, and livelihoods. By understanding how pollinators support food production, societies can also find ways to improve public health and reduce poverty. Professor Jane Memmott, another senior researcher involved in the study, stated that there exists a “win-win” opportunity where both people and biodiversity can mutually benefit. She explained that protecting nature does not always require expensive solutions but instead depends on better ecological understanding and smarter farming methods.
The research team is now working across Nepal with farmers, organisations and government officials to apply the findings to real life. Researchers are teaching communities how to protect pollinators and use more pollinator-friendly farming methods. Early results already show better crop production, improved nutrition and a higher household income. The study is also helping Nepal create a new National Pollinator Strategy, which aims to make biodiversity protection part of everyday farming practices.
Researchers believe the lessons learned in Nepal can apply to countries around the world because modern food systems everywhere still depend heavily on healthy ecosystems and insect pollinators. Scientists say the message is clear: protecting biodiversity is no longer only an environmental issue. It is also essential to human health, economic stability and food security for millions of people worldwide.
