KEEP IN MIND! REALLY IMPORTANT I ALMOST HAD A HART ATTACK! What Prof. Arnold is writhing in his book is all about TRANSITION, if you rush into fruitarian diet, basically your body starts to cleans from posions and they are all going trough the bloodstream.
Let me share with you my experience regarding this. When i first found out about this I felt that it was true (I have like an inner compass for truth, hard to explain), and what I have learned about mucus and where its located in you body and what sorts of problems it can cause I felt like I was eating wrong my whole life garbage, and wanted to cleans my body and eat whats right. And I jumped right in, eating only raw, cooking only soups... I was feeling fantastic, my mental perception was so clear, I could see right trough the bullshit of this society (that can happen also). But one day I was reading something for my research and all of the sudden I felt anxious, my heart started pounding really strong a couple of times, and I was starting to sweat. I' was scared so much I called my mom to come pick me up and get me to the ambulance. When she came I was still feeling anxious, and then something sliced me in my stomach. I went to the bathroom, took a shit, went out, another slice, went again, and like that 2 times more. My body was cleansing it self and I swear to God my shit was BLACK. Later during the week I picked up the book from where I have left, and after reading two more paragraphs I laughed hard.
This is what I've read:

The first lesson has now given you an insight as to
what disease actually is. In addition to mucus and its
toxemias in the system, there are other foreign matters
such as uric acid, toxins, etc., and especially drugs if ever
used. I learned thru the years of practical experience that
drugs are NEVER eliminated as is the waste from foods
but are stored up in the body for decades. Hundreds of
cases have come under my observation where drugs taken
10, 20, 30 and even 40 years were expelled together with
mucus thru this perfect healing system. This is a fact of
basic importanceespecially for the Practitioner. When
these chemical poisons after being dissolved are taken back
into the circulation for elimination thru the kidneysthe
nerves and heart are affectedcausing extreme nervousness,
dizziness and excessive heart-beats, as well as other
strange sensations. The uninformed stands before a mystery
and probably calls the family doctor, who now diagnoses
the condition as "heart-disease" and blames the
"lack of food" instead of the drugs he prescribed 10 years
ago.

And on that note I strongly advise you to take care, read a lot and then follow the teaching of Prof. Ehret in detail. This is not a diet this is a HEALING SYSTEM.
Cheers :)