Energy Metabolism
The 3 main sources of energy in your body are fatty acids, sugars and protein (disregarding alcohol).
Serum Energy
About 2 to 5% of serum fatty acids are free fatty acids. Serum reference levels for free fatty acids are 0.00-0.72 mmol/L.[1] / with a mean value of 7.5 nM (with a standard deviation of 2.5 nM), and a 1.5 nM increase after overnight fasting. [2]
Fasting
During starvation, utilisation of fatty acids from intracellular lipid droplets is increased, and autophagy mediated.[3]
Exercise
Not just daily exercise increases lipolysis in general [4], but also acute exercise increases lipolysis, specifically in the liver (not in skeletal muscle), accompanied by increased serum levels of free fatty acid, glycerol and ketone body.[5]
Better fitness is not associated with lower dietary fat intakes.[6] Increased physical activity reduces serum triglyceride levels.[7] At similar levels mean VO2, tennis match play relies more on glycolysis and glycogenolysis compared to continuous running exercise.[8]
