Yes, cooked leafy greens remain a good source of dietary fiber, although the cooking process can slightly reduce the overall volume and alter the fiber's structure.
Leafy greens like spinach, kale, collard greens, and Swiss chard are naturally rich in fiber. Fiber is a type of carbohydrate that the body cannot digest, contributing to digestive health, blood sugar regulation, and feelings of fullness.
When leafy greens are cooked, the heat softens the plant's cell walls, making them easier to chew and digest. This process can slightly reduce the overall bulk of the greens, meaning you might need to eat a larger volume of cooked greens compared to raw to get the same amount of fiber. However, the fiber itself is not destroyed by cooking. It remains present and beneficial.
Cooking can also make some of the nutrients in leafy greens, including certain types of fiber, more accessible to the body. For example, cooking can break down some of the complex carbohydrates, making them easier to absorb.
To maximize the fiber content and nutrient retention when cooking leafy greens, opt for steaming or sautéing over boiling. These methods use less water and shorter cooking times, minimizing nutrient loss.