Our body maintains homeostasis of blood glucose concentration levels all the time. This homeostasis is maintained at normal levels even after fasting when the liver glycogen stores have depleted.

This is done by our body through increased gluconeogenesis (a process that transforms non-carbohydrate substrates (such as lactate, amino acids, and glycerol) into glucose) and decreased glucose utilization in the muscle.

So, fasting before exercise increases the utilization of body fat as fuel. It also helps in lowering the depletion rate of muscle glycogen.

** For the best fat loss results on a daily basis, don’t eat anything in the morning and exercise at 70% of VO2 max for 90 minutes. If you aren’t sure about your VO2 max, keep your heart rate at 180-your age during the exercise.