An energy system that requires carbohydrates, fats and protein where energy is used in longer period of time ​

The aerobic system

Explanation:

Becasue, Aerobic means 'with oxygen'. This system starts to 'kick-in' after about 3 minutes and theoretically will go on for ever. The ADP formed during energy production uses energy from glucose/glycogen (carbohydrates), fat or protein breakdown to reform ATP.

starvation is bad because your body needs nutrition and to deprive it of nutrition can cause problems with both health and fitness.

explanation:

it can make weight loss slow down over time, but it won't cause someone to gain weight depsite restricting calories. starvation causes weakness in the senses like thirst.