Why colon cleansing sucks?

Why I said colon cleansing sucks. Just think about it, if your colon are full of fat, it would reduce the adsorption of all kinds of nutrients.
The truth is, the colon is just a part of the adsorption tube of your body that would adsorb and decompose all the fat, sugar...everything. And there are also quite a lot of good bacterial there and all the fluids that can help to decompose all the stuff.
You can also think this way, some products said their weight loss effect comes from the colon cleansing. But if the fat sticking to the colon stops the adsorption of the nutrients, then you will get more thinner because your body will not get the nutrients needed, right? This is quite a confusing fact.
You clean your colon and lose weight finally?
So there's no such thing as the fat sticking to your colon for years. That's too ridiculous.
I don't want to say what's those products are. Just be careful if there's such word mentioned.
How to choose the right weight loss product?
I will tell you more in the next part of how to choose weight loss product with a free product as an example.