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Negative feedback mechanism.
Perhaps you don't understand the meaning of positive and negative feedback. Positive feedback keeps adding to a process. Negative feedback doesn't. If a person fills a bathtub, positive feedback will continue the filling even if it runs over. Negative feedback will turn the water off when the tub is filled. So, negative feedback maintains homeostasis. Homeostasis means "steady state". When a processes is completed, it turns it off. Example: Blood sugar levels remain in a certain range.
An example of negative feedback would be a secretion of greater amount of insulin to lower the blood sugar level, and then secretion of greater amount of glucagon to increase the blood sugar level, and then a secretion of a greater amount of insulin to lower the blood sugar level..... etc.
Feedback refers to information provided in response to a stimulus. Negative feedback specifically refers to a response that works to counteract and reverse the original stimulus, maintaining a set equilibrium. A negative feedback response is the specific action taken to reduce the effect of the stimulus. A negative feedback mechanism is the overall process by which the body regulates and maintains internal balance. A negative feedback loop is the continuous cycle of detecting and responding to changes in order to maintain homeostasis.
If your boss told you that you are a lazy person, that is not constructive feedback. Its negative feedback. If they however told you that you need to put more effort into your work by, say, come to work earlier, that would be constructive feedback.