Every square inch of you is covered with bacteria right now, inside and out. Don't freak out, that is a good thing & is mandatory for good health.
Don't every think that anti-bacterial soap, mouthwash is a good thing...
How much should I eat?
How often should I eat?
How much protein do I need?
Should I weigh/measure/portion my food?
These questions came about because we where being fed a commodity-based, high-carb, fiat-food diet.
When you eat a proper human diet, all of these questions become silly.