Plant sterols are natural compounds found in the cell membranes of plants. They resemble cholesterol in structure and can help lower cholesterol levels in humans. When consumed, they compete with cholesterol for absorption in the intestines, which can lead to reduced cholesterol levels in the bloodstream. These compounds are commonly added to certain foods, such as margarine and yogurt, and are available as dietary supplements. Regular intake of plant sterols, along with a balanced diet, may contribute to heart health by supporting healthy cholesterol levels and reducing the risk of cardiovascular diseases.