My perception was that guar gum stayed with me longer than bran. I presumed this was due to the guar gum's viscosity attribute.
Also, I did not feel reduced hunger at time of eating, but instead I noticed this benefit later. Around 8 hrs after ingestion or the next day. This encouraged me to take in small amounts spread out over an hour, 2 or 3 times per day, in order to smooth hunger fluctuations. I no longer use guar gum though.
Apricot