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1.
S₁: In the last. few years, there has been increasing realisation of the importance of fibrous diet.
S₆: This has resulted in a better appreciation of the role of fibrous food in human health.

P: Its role in human nutrition was not fully understood.
Q: Plants contain indigestible substances in their cell- walls, and these contain fibre.
R: Later research has thrown light on many other ingredients that are not digested by man.
S: In the early days, people only knew that this fibre prevented constipation.