You don't need to buy that book, btw.
Just do a cleanse.
There is a variety of herbs etc. that will get your colon back in order and detox your liver etc.
Hemp hearts, consistant use of metamucil (psyllium) and detoxing teas has done it for me. Be sure to take acidophilus to keep the good bugs in you that fight the bad ones.
Also if you suspect that you have actual parasites in you get checked out by a doctor!
I didn't like that site cause it suggested you don't need to eat right and exercise to stay thin and be healthy. That's crap.
A healthy organic balanced diet with regualr exercise is what people need to stay healthy. And don't eat raw fish at sketchy restaurants and watch for symptoms of parasites if you do or travel overseas.
People should also be aware that the prescription drugs they take can disturb your body's natural ability to keep it's self healthy and try to inform them selves of natural alternatives. Most Docs don't bother to inform themselves of natural therapy and some even devalue it. And drug companies are a billion dollar industry without a conscience so don't assume the drugs you take are completely safe or won't while making one health issue better are creating another. It's all about numbers for the health care industry, not the individual. If a drug helps more people than it hurts they doll it out to the public cause it will make money.
But mean while the percentage of folks who are actually left worse off from taking a drug are SOL!!!
Let your Doctor know that you are interested in alterantives and ask them flat out if they have done any research on their own (not tought in med school AT ALL)
and if the answer is no then do it yourself. And perhaps pass on the info with your Doc. But for the record if you are needing a perscription to improve your quality of life by all means take it. Do what feels right to YOU.