Negative Feedback Loop

Figure 1. Negative feedback loop

Negative feedback loops were first invented by evolution to keep processes from running away. The basic idea to think of a circular process which everytime it completes a loop it degrades the entire process a little. This might be animal overpopulation in an area which reduces food, which causes starvation, which causes population decrease, which means less mouths to be fed, or just the feedback loops in blood glucose regulation (see Figure 1).