Charly
The main thing about having worms and parasites in our bodies is that they excrete pure amonia... and that is what makes us sick.
They also eat our nutrients so we are not getting what we should from our food.
The bible talks about parasites. I would have to look up where. It tells of evil a King that was eaten up from the inside out by worms.
Many health experts believe that all of our processed food and the chemicals that we take in causes parasites to stay in the colon and thrive. A parasites job is to clean up messes, so if we eat a lot of refined sugar and processed foods like cheese and dairy products, we get debris in our colon... a build up of fecal matter that hardens into a tube-like structure... parasites live between this and the wall of the intesiine.
If we eat a healthy diet, they are less likely to stay in us when the eggs pass thru. There are eggs everywhere. Parasites are designed to turn us to compost when we die. NOT before!
Cleansing every 6 months keeps the population down so they don't make us sick.
You can read about parasites at
http://www.humaworm.com