"V" is for Very Small Microorganisms

Probiotics . . . so what are these little microorganism?
And why do we need them???
Well . . .to answer that question . . . we must first understand the mechanics of our intestines.
Okay . . . so we have our large intestine which is also known as our large bowel. This is that "last" part of the gastrointestinal tract. And the purpose of this part of the intestines is to absorb water and salts from the material that has not been digested from our food and to get rid of any waste left over as poop.
The large intestine has 3 primary functions . . . absorbing water and electrolytes, producing and absorbing vitamins . . . and forming and eliminating our poop.
But we all knew that . . . right?
Okay . . . so the large intestine houses the largest amount of bacteria in the body, both "good" and "bad". And we need both for optimal health. With "good" needing to be a little more abundant than the "bad".
But . . . when we take antibiotics, prescription drugs, birth control, drink alcohol, smoke, have too much stress in our lives and eat this Western diet we love so much . . .
This all kills our "good" bacteria . . . leaving our "bad" bacteria to take over the large intestine. This leaving us with diarrhea, constipation and irritable bowel diseases just to mention a few.
Now at this time . . . the "bad" bacteria travels to the first part of the gastrointestinal tract called the "small intestine". Which is supposed to be basically sterile.
But . . . this "bad" bacteria now invades this area. Breaking though the "gatekeeper" of the small intestine. And at this time . . . our health and weight becomes compromised.
So why do we need "probiotics"???