In the comments thread under the Mark’s Daily Apple article I posted upthread it’s noted that upon starting RS:
“You will gain 3 pounds in a week, especially if you have been low carb. PS or any RS will feed gut bacteria. They multiply many fold over night and over the next days so you will end up with some extra pounds of gut bacteria – but all to the good. They are doing good work. The body changes towards a gut increase involve a fat loss and a muscle increase - as much as a 10 pound gain over a few months but not necessarily a change in body shape.”
Also, “The total volume of gut bacteria in your large intestine is the size of a football - could be over 5 pounds of biomass.”
Interesting! I don’t weigh - just measure - and I keep shrinking with the doses of RS3 a few times a week. But I never thought of the booming good bacteria growth in terms of actual biomass.