Greater vegetable diversity needed for healthier diets and climate-resilient agriculture

A recent study published in the Proceedings of the National Academy of Sciences highlights the importance of increasing vegetable diversity to enhance nutrition and build agricultural resilience to climate change. Researchers argue that merely growing more of the same common vegetables won't suffice. Instead, they emphasize the need to cultivate a wider variety of vegetable species, traditional varieties and their wild relatives.

This vegetable biodiversity, known as vegetable biodiversity, encompasses the full range of vegetable species, traditional varieties and their wild relatives.

The study underscores that global vegetable consumption averages 40% less than the recommended amount by the World Health Organization, and production remains inadequate to meet these recommendations. Low vegetable intake is among the top five dietary risk factors contributing to global disease burden. Moreover, a significant portion of the world's population cannot afford a healthy diet, underscoring the urgent need to make vegetables more affordable and accessible.

The researchers caution that merely increasing production of today's most common vegetables won't be enough. Many traditional and underutilized vegetables offer valuable nutrients, are well-adapted to local conditions, and hold significant cultural value in local food cultures. Their diverse varieties and wild relatives also contain traits that can aid in developing vegetables that can withstand challenges like heat, drought, pests, and diseases.

The study identifies over 1,480 edible vegetable species worldwide, although the actual number may be even higher, with many poorly researched and underutilized. Using the World Food Map, an interactive resource documenting the diversity and distribution of edible species, the researchers focus on several underutilized species, such as spider plant in Africa, bitter melon in Asia, and the edible leaves of pumpkin, sweet potato, and cowpea.

These vegetables are not only rich in vitamins and minerals but also adapted to challenging growing conditions and valued in local food cultures. However, they receive minimal research, breeding, and conservation efforts compared to globally traded vegetables and staple grains.

The researchers highlight the critical need to safeguard vegetable biodiversity, as many of these resources are already disappearing. Traditional vegetable varieties have seen substantial declines over the past century, while almost one-quarter of wild relatives of major vegetable crops are threatened with extinction. While conserving seeds in genebanks like the Centre for Genetic Resources, the Netherlands, helps prevent their permanent loss, improving nutrition also requires ensuring that diverse vegetables continue to be bred, grown, sold in markets, and consumed by consumers.

The researchers outline four key priorities for governments, funders, and researchers to shift vegetable biodiversity from an overlooked resource to a central component of efforts to enhance diets, strengthen climate resilience, and develop the vegetables needed for the future.