Peels, Stalks, and Seeds: The Fiber We’ve Been Throwing Away

A study from King’s College London looked at 12 common fruits and vegetables and found that in 10 of them, the parts people often discard — peels, skins, stalks, and seeds — contained more fiber than the portions usually eaten. In other words, the compost bucket may be getting some of the best nutrition in the kitchen.

For growers, this is not just a dietitian’s fun fact. It opens the door to more root-to-tip marketing, value-added products, and consumer education. Broccoli stems, squash seeds, citrus peels, apple skins, and beet greens all have potential when handled safely and presented well.

The food system has trained shoppers to want polished, trimmed, convenient produce. That has benefits, but it also creates waste and hides value. If consumers learn to cook more parts of the plant, farms and retailers may be able to sell a fuller harvest rather than trimming away margin.

There are practical limits, of course. Some peels or leaves are tough, bitter, pesticide-exposed, or not commonly eaten for good reasons. Food safety, variety choice, residue management, and clear preparation guidance all matter. Nobody wants a fiber revolution that tastes like a fence post.

Still, this research gives farmers another story to tell: the plant is more useful than the package suggests. Sometimes sustainability is not about inventing something new. Sometimes it is about eating the parts we forgot were food.