In what order does the body access carbohydrates lipids and proteins?

The body primarily accesses carbohydrates first, as they are the quickest source of energy, particularly glucose. Once carbohydrate stores are depleted, the body shifts to lipids, utilizing fats for energy through processes like beta-oxidation. If energy needs persist and both carbohydrates and fats are insufficient, the body will then begin to break down proteins for energy, although this is less desirable as it can lead to muscle loss.