Which component is a major part of feces?

Cellulose is a major component of feces because it is a form of dietary fiber that is not fully digested by humans. It primarily comes from plant cell walls and contributes significantly to the bulk of stool. While fats, proteins, and carbohydrates are indeed present in various amounts in the diet, they undergo digestion and absorption in the intestines. In contrast, cellulose passes through the digestive system largely intact and helps to organize fecal matter, promoting healthy bowel movements and preventing constipation. This role of cellulose in adding bulk and facilitating the passage of feces underscores its significance in gastrointestinal health.