As some people here already know since I talk about it endlessly, I have a weird medical condition where I have not eating solid foods in almost a year now. You have no idea how much fiber you need just to have decent bowel functions when you start at a base of zero.
I drink four cans of V8 and take 2 Metamucil capsules a day to get me up to about 30g. Still less than the recommended amount, but it’s all I can manage at the moment.
Before that, there were a couple of times when the constipation was so painful that I literally started yelling, “OH FUCK! OH FUCK! OH FUCK!”