What types of neural and chemical feedback from the body does the brain reply on to govern food intake?

The riddle of hunger, satiety, and body weight is a complex puzzle scientists have yet to solve. Bombarded with external environmental food stimuli and further confounded by genetic underpinnings (view the powerful video about Prader-Willi Syndrome – https://www.youtube.com/watch?v=03DFb72zZ8w), researchers have difficulty elucidating the biological mechanisms of hunger and its regulation by the brain. To date, several biological theories have been developed to address the topic. To complete this discussion, answer the following questions below.
What causes hunger?
What are the main roles of insulin and glycogen?
What types of neural and chemical feedback from the body does the brain reply on to govern food intake?
How does the glucostatic theory of hunger differ from the dual-centre set-point theory of hunger?
Which theory has more evidence to support it?
What is the role of neuropeptides in producing satiety?

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