Question: Midichlorian's are chemical compounds found within every living cell that forms the basis between the connection life and the Force. Without midichlorians, life would be impossible. The amount of midichlorians in a life form represents its ability to understand, comprehend, and manipulate the Force.

My name is Darth Incognitus, and I have decided to absorb more of these cells into my own body to make my force sensitive abilities stronger. To accomplish this, I have kidnapped numerous force sensitive users who match my blood type. When their midichlorian count has been measured, I will perform a blood transfusion from them to myself in order to absorb these cells. After I have attained enough of these cells, I will become the most powerful force user in the world and create my Sith empire. Then, I will use this method to strengthen my apprentices and students.

However, after a number of tries, I have noticed that my powers have not increased. No matter how many Jedi I murder and drain of blood, my abilities remain average. Why would this be the case?

Answer: 
Because the blood level midichlorian equilibrium point is determined by your body's biochemistry. You can't alter this by adding more midichlorians. All that does is cause a temporary imbalance (way too short for your body to make use of it) that your body quickly fixes. Excess midichlorian gets filtered out by the kidneys and ends up down the drain. Literally.
**If you try it, your midichlorians might fight each other to the death.**

What if what modern science calls midichlorians are actually the immortal beings of ancient legend, the Whills? These microscopic sentient creatures are the true masters of the Force, and they are at war. To them, Jedi and Sith are just fleshy Death Stars that they use to attack each other.

> 
> "[The next three Star Wars films] were going to get into a microbiotic
>  world. But there's this world of creatures that operate differently
>  than we do. I call them the Whills. And the Whills are the ones who
>  actually control the universe. They feed off the Force." - George Lucas
> 
> 
> 

(This nearly became canon... but then he sold the franchise to Disney, who seem to be taking it in a different direction)

If you mix light and dark midichlorians, they'll go to war inside your body and destroy each other, and possibly you.

A Jedi will obviously never try this trick on other Jedi. A Sith might consume other Sith, but as we all know Sith are very cranky and do not play well with others. The dark Whills who drive them may have a similar temperament, so mixing rival factions of dark Whills in one body could also mess you up.

But ultimately, **the Whills are in charge, not you. This plan could work, but only if the midichlorians in your body and your victim's body want it to work.**