Which is burnt first carbohydrates or lipids and why?

Carbohydrates are typically burned first for energy because they are more readily accessible and can be metabolized quickly. The body prefers glucose, derived from carbohydrates, as its primary energy source during high-intensity activities. Lipids, while providing more energy per gram, are metabolized more slowly and are primarily used during lower-intensity, prolonged activities when carbohydrate stores are depleted.