Vegetable Diversity – The "Key" to Increasing Food System Resilience to Climate Change

Vegetable Diversity – The "Key" to Increasing Food System Resilience to Climate Change

Illustrative photo: Freepik

In late July, an international team of scientists called for a coordinated global effort to "conserve, safeguard, and better utilize" vegetable varieties that are not currently grown on a large commercial scale, warning that modern food systems rely overly on a narrow set of familiar crops.

The report, published in the peer-reviewed multidisciplinary journal Proceedings of the National Academy of Sciences (PNAS), cited vegetables such as spider plant in Africa, bitter melon in Asia, and slippery cabbage in the South Pacific as prime examples of vegetables that could diversify human diets while helping agriculture adapt better to climate change.

Current food systems depend excessively on a handful of familiar crops. Photo: Work Week Lunch

According to experts, relying solely on staple produce—such as the standard varieties of eggplant, kale, cabbage, carrots, lettuce, onions, and tomatoes found in typical supermarkets—may prove inadequate to withstand future climate challenges.

"The solution isn’t just to grow more vegetables. It’s to grow a greater diversity of vegetables," said Maarten van Zonneveld, the agricultural scientist leading the study, in a statement to the World Vegetable Center.

Researchers noted that there are at least 1,480 edible vegetable species worldwide. Conserving these species goes hand in hand with making nutritious food more accessible and affordable to more people.

Vegetable Biodiversity Under Threat

According to the report, vegetable biodiversity—the "entire spectrum" of existing vegetable species—is rapidly declining. Researchers noted that approximately 80% of studies reviewing genetic erosion in vegetables documented significant losses over the past century.

Among wild relatives of 79 staple vegetable crops assessed for extinction risk, about one in four species faces the threat of extinction. Meanwhile, research and breeding efforts remain heavily concentrated on a small group of high commercial value crops, such as tomatoes and peppers, while nutrient-dense greens like spinach or red cabbage receive far less attention.

"Vegetable biodiversity is one of the world's most valuable assets for improving diets and adapting agriculture to climate change," said Colin Khoury, head of global conservation at the Crop Trust—a non-profit organization dedicated to safeguarding crop diversity—speaking with the World Vegetable Center.

"Yet we are losing this resource right when we need it most. Conserving vegetable biodiversity is not simply about preserving the past; it is about ensuring we have more choices for the future."

Promoting vegetable biodiversity—and offering a richer variety on supermarket shelves—could yield far-reaching benefits. According to researchers, on average, people worldwide consume about 40% fewer vegetables than the amount recommended by the World Health Organization (WHO).

This deficit is even higher in low-income nations, and inadequate vegetable intake ranks among the top five dietary risk factors for disease globally, according to researchers.

As previously reported by The Guardian, United Nations data shows that over one-third of the world's population cannot afford a healthy, nutritious diet, further emphasizing the urgency of making diverse vegetables accessible and affordable.

Cultivating and consuming a wider variety of vegetables can help address multiple challenges simultaneously. Researchers point out that many vegetables grown on a small scale are often better adapted to local growing conditions than introduced varieties, and they can provide higher concentrations of essential vitamins and minerals.

The conversation around vegetable diversification goes beyond taste and personal preference; it directly impacts food security and long-term climate resilience.

As more native vegetable varieties face the risk of disappearing, bringing lesser-known greens back to the dining table is not just about reviving agricultural heritage—it opens up more options for our future, in terms of both human nutrition and the resilience of the global food system.