May 11, 2026 | written by: Tommaso Ciuffoletti
On the occasion of World Bee Day (May 20) and the International Day for Biological Diversity (May 22), we explore the deep—and often invisible—link between biodiversity, pollination and human nutrition. Starting from a recent study published in Nature, we examine how the decline of pollinators is not only an ecological loss, but a concrete threat to food security, diet quality and the livelihoods of the most vulnerable farming communities.
Through empirical data and predictive models, a counterintuitive reality emerges: pollinators are not central to the quantity of food produced, but they are crucial to its nutritional quality. A finding that invites us to rethink biodiversity not as an abstract value, but as a concrete infrastructure for human health.
Bee Day is not (only) about bees
May 20 marks World Bee Day. Two days later, on May 22, we celebrate Biodiversity Day. Two dates close on the calendar, yet often treated as separate themes: pollinators on one side, the variety of life on Earth on the other.
And yet, if there is a point where these two dimensions meet in a direct and measurable way, it is in the food we eat. Not in a symbolic sense, but in a very concrete one.
A recent study published in Nature set out to make this connection visible by tracing the full pathway linking biodiversity to human life. Not stopping at ecosystems, but reaching all the way to people. It does so by reconstructing, in smallholder farming communities in Nepal, a precise chain that runs from pollinators to crops, from nutrients to diets, and ultimately to income.
Over the course of a year, researchers collected detailed data on individual diets, agricultural production, household economies and interactions between insects and plants—offering one of the first empirical demonstrations of how biodiversity directly shapes everyday life.
Not quantity, but quality
The most interesting finding is not how much pollinators contribute to agricultural production, but what they contribute to. Only a relatively small portion of the diet, in terms of weight, depends on pollinated crops. Yet this portion provides many of the essential micronutrients for human health: vitamin A, folate, vitamin C, calcium and iron.
The distinction is subtle, but crucial. Calories can be replaced, often through imported and standardized foods. Micronutrients, however, depend much more closely on the diversity of local crops—and therefore on biodiversity. In this sense, pollinators do not determine how much we eat, but how well we eat.
A silent loss
When this relationship is projected into future scenarios, the picture becomes more tangible. The study simulates different levels of pollinator decline and shows that even moderate reductions can have measurable effects: a decrease in key micronutrient intake, an increased risk of nutritional deficiencies and a reduction in farming income.
In already vulnerable contexts, where access to a balanced diet is limited, these changes are far from marginal. They can mark the difference between adequacy and deficiency. This is where the issue shifts: it is no longer only environmental, but clearly a matter of public health and economic stability.
There is also a less intuitive aspect. Not all species contribute equally. A significant share of pollination services is provided by a relatively small number of abundant groups, such as local bees, bumblebees and other often-overlooked pollinating insects.
This concentration makes the system efficient, but also exposed. When a critical function depends on a few actors, vulnerability increases. It is a dynamic not limited to ecosystems, but common to many complex systems: they work well—until something breaks.
Ecosystems and nutrition
One of the most interesting aspects of the study is that it does not stop at describing a risk, but identifies potential levers for action. These are not advanced technological solutions, but relatively simple ecological practices: maintaining wild plants that support pollinators, diversifying agricultural landscapes, reducing pesticide use and encouraging forms of local beekeeping.
The point is not any single measure, but the overall approach. Improving nutrition does not only mean acting on diets, but on the ecological conditions that make those diets possible.
In many cases, these interventions are accessible even to smallholder farmers and can simultaneously improve productivity, food quality and the resilience of agricultural systems.
One of the challenges in talking about biodiversity is that it often remains abstract. Studies like this help make it more tangible, showing how it translates into concrete aspects of daily life: stable harvests, nutritional quality and economic security.
In this perspective, biodiversity resembles an invisible infrastructure. We do not always see it, but it supports much of what we take for granted. And precisely for this reason, its degradation risks being noticed too late.
A global issue
It is true that the study focuses on a specific region with well-defined characteristics. But the mechanism it describes is not isolated. Even in highly globalized food systems, there is a chain linking ecosystems, production and consumption—only it becomes longer and less visible.
This makes the connection less immediate, but no less real. The difference is that in more complex systems, it becomes harder to recognize and therefore harder to address.
In the daily work of organizations like Treedom, biodiversity often takes shape through concrete actions: planting a tree, supporting an ecosystem, contributing to the regeneration of a landscape. This study suggests that these actions go beyond symbolism. They are part of a network of relationships that ultimately reaches human health and well-being.
It is not about establishing a direct and linear link between a single action and a single outcome, but about recognizing that every intervention on an ecosystem affects a broader balance—one that also includes how we produce and consume food.
Two days, one question
World Bee Day and Biodiversity Day can be seen as two separate moments, or as two ways of asking the same question: how much do we really depend on what we often take for granted?
In this sense, bees are not just a symbol. They are an entry point—a way to look more closely at a complex system made of relationships that span the environment, the economy and human health. A system that works quietly, but becomes visible when it begins to lose its balance.
