Lignin

Definition

An insoluble polymer present in plant cell walls, particularly in woody structures. It's a key structural element of dietary fiber.

How it works

Lignin is technically a polymer rather than a sugar, distinguishing it from other fibers. It provides structural rigidity to plants and increases in concentration as plants mature. In a nutritional context, it is classified as an insoluble fiber and cannot be fermented by intestinal microbiota. Lignin has antioxidant properties and may help reduce dietary cholesterol absorption. It is found in greater quantities in older plants or the stiffer parts of vegetables.

Role

Provides significant mechanical action for transit and has antioxidant properties.

Examples

• Wheat bran, Mature broccoli, Cauliflower, Dried beans, Pumpkin seeds

Recommendations

Lignin is particularly useful for those seeking to reduce cholesterol. Vary your sources of fiber by including foods containing lignin. Gradual addition helps adapt your digestive system to these less fermentable fibers.

Key takeaway

Lignin is an insoluble fiber with beneficial antioxidant properties for cardiovascular health.

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