Most feedbabk loops hormones work on a negative feedback loop, that increase output from system inhibits future production of the hormone by the system, the body reduces the amount of the hormone or proteins when their levels get too high in the bloodstream (most of the endocrine hormones are regulated that way), this ensures homeostasis. The negative feedback is the most common in the human body. The feedback loops control the amount and liberation of hormones by the balance of concentration of these in the bloodstream, if there is high amount of the substance it will start several molecular signals that will interrupt the production of the hormone, and therefore give the time for the body metabolize the ones already present in the bloodstream.