Scientific research validates that fanatic adherence to SCD is needed in order to starve out the bacteria :

A high percentage of people with digestive problems have biofilms inside their bodies[1]. Many DAN doctors are discovering that this also applies to children with autism.

A biofilm is a colony of microorganisms that develop brilliant survival strategies. The bacteria that live in biofilm can exist with very little food. The biofilm enables them to starve for a long time.[2] They are extremely efficient with any food supply. Nothing is wasted. Different types of microorganisms share the same food meaning one bacteria's waste may be used by another kind of bacteria that utilizes the discarded food. [3]

Bacteria have the ability to live in biofilm on minute amounts of food making them very resistant to antibiotics[4]. Biofilms emit chemical weapons against the very body where they reside.[5]

Gram negative bacteria residing within biofilms have the ability to live with severe limitations of food because they developed a special biochemical process.[6] These gram negative bacteria are abundant in the bodies of people with IBD and also those with autism. The gram negative bacteria contain a poison called "endotoxin" or LPS. LPS is capable of inducing a variety of severe reactions and conditions including IBD[7] and aberrant brain development[8]. LPS is very destructive because it provokes the body to produce an immunological response.

The requirement for strictness is because we are fighting extremely hardy microorganisms. One crumb of the wrong food feeds millions of harmful bacteria for a month, and continues the cycle of destruction. Larger quantities of undigested food can provide enough nutrients to feed a huge army of bacteria and allow a biofilm to continue residing in the body where it continues to proliferate poisoning.

Click here to view another very important reason for strict adherence

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References

[1] Bacteria from biofilm were found in 90 to 95% of IBD patients, 95% of patients with self-limiting colitis, 65% of IBS patients, and 35% of healthy controls.

The author of this study uses the term "mucosal bacteria" to describe bacteria from biofilm. He explains his terminology at the third paragraph after the INTRODUCTION of his article:
"The term biofilm has been used to describe a structured community of bacterial cells enclosed in a self-produced polymeric matrix and adherent to an inert or living surface. The mucosal bacteria found in patients with IBD can thus be regarded as intestinal biofilms."
Explanation of "mucosal bacteria".

The abstract of this article on PubMed
"Mucosal bacteria were found at concentrations greater than 109/ml in 90 to 95% of IBD patients, 95% of patients with self-limiting colitis, 65% of IBS patients, and 35% of healthy controls."

[2] http://www.ncbi.nlm.nih.gov/pubmed/9172348?dopt=Abstract

Bacteria in biofilms were able to survive despite starvation for 43 days!

[3] The book, The Biofilm Primer, by J. W. Costerton describes how bacteria in biofilm work cooperatively to share the food supply and avoid wasting any source of food. Click on page 72 to read more about this topic. View the book

[4]The following three scientific articles discuss how bacteria have the ability to live in biofilm on minute amounts of food and how this is making them very resistant to antibiotics.

http://aem.asm.org/cgi/content/full/64/4/1526?ijkey=fcee9fc41513fdb0e0a2bb6287dab046a6bc0aa2#Introduction

"Biofilms are known for their recalcitrance to antimicrobial agents. One of the mechanisms proposed to explain the enhanced resistance of microbial cells within biofilms is the existence of physiological differences between biofilm and planktonic cells (1). One physiological difference, starvation, is thought to play an important role in resistance to antimicrobial treatment."

http://cmr.asm.org/cgi/content/full/15/2/167#Altered Growth Rate of Biofilm Organisms

"Another proposed mechanism for biofilm resistance to antimicrobial agents is that biofilm-associated cells grow significantly more slowly than planktonic cells and, as a result, take up antimicrobial agents more slowly."
http://aac.asm.org/cgi/content/full/47/4/1251?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=lactamase&searchid=1&FIRSTINDEX=220&resourcetype=HWFIG#BDY

Our hypothesis was that some of the bacteria in these biofilms experience nutrient limitation and enter a stationary-phase state. It was further hypothesized that bacteria that had entered stationary phase would be protected from killing by antibiotics as long as they lacked key nutrients.

[5] http://www.sciencedaily.com/releases/2008/07/080723094848.htm

Biofilms emit chemical weapons against our body?

[6] http://cmr.asm.org/cgi/content/full/15/2/167#Other%20Physiological%20Changes%20Due%20to%20Biofilm%20Mode%20of%20Growth

"Gram-negative bacteria respond to nutrient limitation and other environmental stresses by synthesizing sigma factors."

[7] LPS is capable of inducing IBD
http://www.ncbi.nlm.nih.gov/pubmed/3961278?dopt=AbstractPlus

[8] LPS is capable of inducing aberrant brain development
http://www.ncbi.nlm.nih.gov/pubmed/17211134?ordinalpos=5&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum