It's because it's complicated, your energy is the product of your physical, mental and social environment, including your body and mind. It's a resource that affected by your health as much as you perception and abilities, and in turn all of these affect each other, they are interconnected, and it's all a big jumble. Eat right, think right, move right is all you can do, but if you have an underlying condition, you were abused as a child, or simply just live in the 21st century with all of it's stresses it's not that easy.
At the end of the day you are just one flimsy person in this big pile of spaghetti, surviving the best you can, so you have to learn to let it go. Not entirely, not to the point of an accelerated decay, but to the point of not taking life and yourself too seriously. You have to be like water.
