Calories is watching fat intake with food. if you're trying to watch your calories yes it's the fat, because you are trying to eat less fat to maintain a good diet.
sugar crash is to much sugar intake and it makes you fatigue and go to sleep or you feel drowsy and lazy. To much sugar intake is a reason for sugar crash.
Endurance is the answer i think you're looking for.
Answer:
the answers are the first one and the third one
Minimum 13:36. points 42.3
Maximum<9:12. points 60
