The amount of glucose that is stored in the body is limited and can get depleted quickly. It is not possible for the body to meet the energy demands of the brain, the nervous system and other body parts for a sustained period of time, using only the stored glucose. After eating, when all the glucose the food has been stored away, and no more glucose is being absorbed from the intestine, the body begins rationing the use of now precious glucose.
The brain and nervous systems are vital and therefore they get small, requisite amounts to keep functioning. The use of glucose by other body organs is decreased. Nevertheless, the other organs of the body still need to work and therefore the body starts looking for an alternate source of energy.
At the end of a three-hour period after a meal, both glucose and insulin levels are low in the body. The amount of insulin present is not sufficient to prevent fats from being released into the bloodstream. This is the time when fat becomes the dominant source of energy for the body. This energy generating system is also known as ‘glucose sparring’ and it works with the assistance of a hormone called Glucagon. Glucagon sends out two signals – one to the liver to release glucose and the other to the adipose tissues to release fats into the blood. Therefore three hours after a meal is the ideal time to exercise for fat burning.
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