Metabolic pathways are regulated to maintain homeostasis in the face of changing environmental conditions,such as nutrient supply.Describe how this is accomplished during the fed-fast cycle,that is,the progression from a fed state,to a postabsorptive/fasting state,to starvation,to prolonged starvation.Your answer should include specific processes/ metabolic pathways that are favored under each condition-make sure to cover pathways that are important to all three macronutrients (CHOs,lipids,protein).Also indicate the signal(s)involved in modulating these pathways.An example is provided in the table.
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