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«In conclusion, contrary to popularly held beliefs, reducing or stopping dietary fiber intake improves constipation and its associated symptoms» (see)

That conclusion comes from a 2012 study, where:

• 63 subjects that suffer from constipation are studied. At the baseline all patients are already eating a high-fiber diet.
• They take no fiber for two weeks and after that they are instructed to eat «as little fiber in the diet as they were able to follow if this were to give them relief from their symptoms«

I will focus on the results from the 41 subjects that followed a no-fiber diet for the 6 months of the study:

• At the baseline 63 out of the 63 patients had constipation. No one of the no-fiber group had symptoms 6 months later.
• At the baseline 31 out of the 63 patients had anal bleeding. No one of the no-fiber group had symptoms 6 months later.
• And so on…

Cases	Baseline. All (n=63)	6-months. No dietary fiber group (n=41)
Anal bleeding	31	0
Constipation	63	0
Bloatedness	33	0
Strain in bowel opening	63	0
Abdominal pain	13	0

This is the original data:

Further reading:

• Study finds dietary fibre is more likely to be cause of, rather than a cure for, constipation and other bowel symptoms
• Dear Mark: What’s the Deal with Fiber?
• La importancia de la fibra al adelgazar por Carlos Abehsera
• ¿Estreñimiento? Consume grasa no fibra