Final answer:
In response to aerobic exercise, the body adapts by increasing the utilization of fats for fuel which supports sustained energy production for long-duration, low to moderate intensity activities.
Step-by-step explanation:
The adaptations of fuel metabolism due to aerobic exercise, particularly in relation to fat, include an increased utilization of fat as a fuel source. During low-intensity aerobic activities, the body tends to use more aerobic metabolism to supply ATP to muscles. In this process, fatty acids serve as the primary energy source. Aerobic metabolism is more efficient and produces a larger amount of ATP using primarily the fat reserves of the body, which can sustain activity for an extended time.
As exercise intensity elevates and muscle glycogen stores begin to diminish, the body increases fat oxidation to continue fueling aerobic pathways. This metabolic adaptation allows an individual to sustain aerobic activities for longer durations, making fatty acids the predominant fuel source for muscles during continuous, moderate intensity exercise sessions.