The body can run on any amount of calories you give it. If you feed it a small amount, it will use it, and what it isn’t provided with, it will take from elsewhere. It’s an incredibly efficient machine with the ability to scavenge energy from muscle, fat and even bone density!
This, however, does not mean that it will run and build muscle efficiently having to scavenge around. It just means that the body learns to take what it gets, and gives minimal energy output.
So how do you get through your day and perform at work, PLUS get to the gym having the energy to overload your muscles, heart and lungs and the rest, as well as get a growth response to the training, if you aren’t switched on 100% about the nutrients that the body needs and runs on? The answer is through understanding your nutrition.