FEEDING-FASTING CYCLE

FEEDING-FASTING CYCLE

• The utilization of metabolic fuel is not the same during the 24 hour period because humans are intermittent feeders.

• The fed (postprandial) state occurs during and just after a meal. • Plasma substrate levels are elevated above the fasting level.

• The fasting (postabsorptive) state occurs several hours (usually 10 - 12 hours) after eating.

• The metabolic fuels used by tissues are derived from mobilized stores of fuel molecules.

HMP shunt

• Starvation occurs after extended fasting (2 to 3 days without food).

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