4. Fainting
In the case of fainting, there are many possible causes, even when we only take on account hormone imbalance. For example, type I diabetes is caused by an insufficient level of insulin in the body. As we have stated before, the main function of insulin is to induce cells in the body to take sugar from the bloodstream so they can burn it and extract energy from its molecular links.
Some cells in the body can burn other substances, like fat, but in the case of our brain cells, sugar is the only fuel they can use. If they cannot absorb enough sugar, they will malfunction. Fainting is a way for our brain to use as little energy as possible, to make up for the insufficient intake. Fainting can also be a consequence of low adrenalin, because insufficient adrenalin can cause our blood pressure to plummet, even to the point of losing our consciousness.