We need fiber because it is essential for maintaining good digestive health, preventing constipation, and supporting overall well-being. Fiber, found in plant-based foods like fruits, vegetables, whole grains, and legumes, passes mostly undigested through the digestive system, aiding in stool bulk and regularity. Soluble fiber helps reduce cholesterol and manage blood sugar levels, while insoluble fiber promotes healthy bowel movements. Additionally, a high-fiber diet supports a healthy weight, lowers the risk of heart disease, type 2 diabetes, certain cancers, and may even contribute to a longer lifespan. Fiber also feeds beneficial gut bacteria, improving gut health and reducing inflammation.