Your ability to take action starts with some initiating sensation or internal trigger, kicking off the prediction engine that is your mind.
Our selfish brains are survivalists. They evolved over millions of years, and kept us usually on the best track. When food is scarce it prompted us to get the energy it needed to survive. When food is scarce it also will silently channel energy away from the body, so that it can continue to think clearly… after all, it has to have the energy to keep us operating and surviving!