colon cleansing????????????

I have been trying to lose weight, I’m doing good so far, Someone told me i should use colon cleanser to clear all the old foods in my body?

I am willing to try this; but what is the best one?

& how should I do it? I don’t wanna use it to fast so i won’t gain back all the pounds.

Also, colon cancer runs in my family serverly, so by doing this can it help prevent it?