Pectin vs. Cellulose fibers

[InstantCoffee]

Sit down because I'm about to bring some SCIENCE up in this joint.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4133521/

The type of dietary fiber intake may influence bile acid metabolism. For example, daily dietary supplementation for four weeks with the purified fiber components pectin and cellulose in humans leads to differential bile acid composition. In cellulose-treated volunteers, cholic acid increased whereas deoxycholic acid decreased, which inversely occurred in pectin-treated individuals[107]. Increased concentrations of cholic acid and chenodeoxycholic acid have been reported in CD patients[108], and lithocholic acid has been reported particularly in ileal CD patients[109]. Interestingly, all of these bile salts induced the expression of the lpf operon in AIEC LF82 strain[86]. Therefore, dietary fiber consumption could also influence the tropism of AIEC for CD ileal tissue by altering bile acid composition and thus the expression of lpf in AIEC in the gut.

These studies demonstrate that dietary components may impact the success of AIEC in colonizing the host and therefore contribute to disease susceptibility. For that reason, intervention studies are needed to evaluate the effects of diet, probiotics, and/or prebiotics on the intestinal microbial community, including the AIEC population with respect to CD activity status and disease progression.

TL;DR:
Consuming a high cellulose diet increases the bile acids linked to AIEC - a bacteria believed to be responsible for Crohn's symptoms.

Further explanation of the correlation is not given. It could suggest that the AIEC thrives in an environment high in cholic acid, so eating something that creates that environment is, therefor, inadvisable.

High cellulose plants:
Broccoli, Brussels Sprout, Cabbage, Collard Greens, Kale, Horseradish, Rutabaga, Turnip, Chinese Cabbage, Cauliflower, Broccoli Rabe, Daikon, Bok Choy, Radish, Kohlrabi

High Pectin Fruits
apples
citrus rinds
crab apples
cranberries
currants
gooseberries
plums
grapes
quinces

Low Pectin Fruits
apricots
blueberries
cherries
elderberries
peaches
pears
pineapple
raspberries
strawberries

Interesting because I can't have many of the high pectin fruits like apples. I can however have kale safely.

Throwing this in here for good measure too
http://www.researchgate.net/profile...'s_Disease/links/54b19a200cf28ebe92e18ee6.pdf

Research in animal models and cell lines have supplied us
with candidates for environmental factors that may allow
stimulation of the adaptive immune response by luminal bacteria.12
Bacterial adherence and translocation are inhibited by the
mucous layer, the integrity and selective permeability of the epithelium,
and bacterial clearance mechanisms. Processed or industrialized
foods contain numerous combinations of products that
may affect the intestines’ ability to contain bacteria to the lumen.
Roberts et al23 demonstrated that translocation of adherent invasive
E. coli (AIEC) across intestinal M cells and Peyer’s patches is
increased by exposure to low levels of a commonly used emulsi-
fier (polysorbate 80) commonly used in ice creams, whipping
creams, dessert toppings, and condiments. This emulsifier is in
dill pickles. Carboxymethylcellulose (E 466), an emulsifier and
thickener commonly used in dairy products, processed meats,
and breads may allow bacteria to migrate and adhere to the epithelium,
possibly by affecting the mucous layer.22 The microbiome
is clearly altered by diet.6 Milk fat and animal fat have
been shown to increase IP and alter the microbiome.21 Martinez
et al19 compared CEABAC10 mice with or without AIEC with
WT mice with or without AIEC; both groups were fed a western
diet rich in fats and simple sugars or regular chow. The Western
diet promoted mucin-degrading bacteria increased AIEC counts
and increased intestinal permeability.19 Gliadin from Gluten
induces zonulin release in the small intestine, increasing IP in
a dose-dependent fashion.34 Maltodextrin has been found to promote
AIEC biofilms and increase adhesion of AIEC strains to
epithelial cells and macrophages.35 Maltodextrin is a thickening
and binding agent found in breakfast cereals and aspartame and
sucralose, commonly used as artificial sweeteners