The body processes carbohydrates differently based on their types. Simple carbohydrates, like sugars, are quickly digested and cause rapid increases in blood sugar levels. Complex carbohydrates, found in whole grains and legumes, take longer to break down due to their higher fiber content, resulting in a more gradual blood sugar response. The glycemic index (GI) of foods can also influence how carbohydrates affect energy levels and appetite. Understanding these differences is crucial for managing energy and nutrition effectively.