Protecting pollinating insects could improve diets and livelihoods worldwide – new study

In Nepal’s remote mountain district of Jumla, preparation for a family meal begins long before food reaches the cooking pot. It starts in terraced fields of beans, buckwheat, apples and pumpkins that must be ploughed, planted, tended and harvested before a family can eat.

But other workers often go unseen: the pollinating insects. By moving pollen between flowers, pollinators ensure that crops bear healthy, nutritious fruit to eat and sell.

Most people don’t think about insects when they eat. But in farming systems like this one, the link is direct and stark. If pollinators decline, crop harvests decline. That can mean less food on the plate, fewer nutrients in people’s diets, and less income for the household.

In our new study, published in the journal Nature, we set out to trace that chain of connections directly: from pollinating insects to crops to human diets and livelihoods.

Working in ten smallholder farming villages in Jumla, our team recorded the diets of 776 women, men and children over a full year. We measured where key nutrients came from, and how this changed through the seasons. At the same time, we surveyed the insects visiting crops and analysed the pollen they carried, to identify which species were helping produce the foods people rely on.

The first thing that stood out was just how local these diets were. More than 80% of people’s intake of many key micronutrients – including vitamin A, folate, vitamin C, calcium and vitamin B12 – came from foods grown or raised in nearby villages. This shows just how closely people’s health is tied to their surrounding landscape.

Most people’s diets were dominated by staple cereals like rice and wheat, which do not depend on insect pollination. But pollinator-dependent crops – including fruits, vegetables and beans – punched far above their weight nutritionally and economically. These foods provided more than 60% of people’s vitamin A, folate and vitamin E intake, and up to 90% of farming income.

In places like Jumla, pollinators are not simply supporting production – they are helping keep families fed and providing crucial cash to meet basic needs. Given the high levels of poverty and malnutrition that already exist, families simply cannot afford to lose them.

When pollinators decline

Pollinator decline is no longer a distant threat. Local beekeepers in Jumla have reported sharp drops in honey production in recent years, with some hives dying out completely. They point to changing weather, fewer wildflowers due to heavy grazing, and increasing pesticide use as the problems. Wild pollinators such as bumblebees, butterflies and hoverflies are likely to be under similar pressure.

If current trends continue, farming income could fall by around 15% by 2030, with vitamin A and folate intake dropping by almost 10%. And if local pollinators disappeared entirely, families could lose nearly half of their farming income and more than 20% of their vitamin A and folate intake.

The risks to health are clear. Vitamin A deficiency can damage eyesight and weaken the immune system. Low folate intake increases the risk of serious complications in pregnancy, including birth defects in babies. In communities already facing high levels of malnutrition, pollinator decline would add yet another strain.

The situation in Jumla is not unique. Smallholder farms make up 84% of all farms worldwide and feed 2 billion people. These farms are highly exposed to environmental change and the families that depend on them already struggle with poor diets and poverty. Even when our food comes from supermarkets and long supply chains, much of it still begins with pollination by insects. The link between biodiversity and human health is still there – it is just less visible.

However, there are signs that this pollinator-nutrition link can be strengthened. In Jumla, farmers are already testing pollinator-friendly practices such as planting flowers around fields, protecting nesting habitats, reducing pesticide use and keeping native honeybees. Our results show promising signs of change. When pollinator numbers increase, so does the production of nutritious food to eat and sell.

The lesson from Jumla is clear. Biodiversity loss is not just an environmental issue, it is a growing threat to human health. At a time when governments like the UK are warning that biodiversity loss poses serious risks to national security, the story in Jumla helps explain what that means in practical, human terms. But it also shows that by supporting the ecosystems around us, we can help secure healthier diets and more resilient livelihoods for the future.

This work was funded by the Natural Environment Research Council (NERC) coordinated through the Belmont Forum

Jane Memmott receives funding from NERC, BBSRC & The Belmont Forum.