Less calories means less energy, which means you have to use the energy you do have more optimally. If there was no impact on cognitive performance, then all th

Less calories means less energy, which means you have to use the energy you do have more optimally. If there was no impact on cognitive performance, then all that means is you spent extra energy before doing stuff that didn't require the excess energy. A good example might be overthinking. Some of our lives and jobs are much simpler than we realize.