Tomato skins are totally indigestable, they pass through intact.

Isn't that what most fibre does? Or am I missing something? I think the seeds are probably inedible too - The point of seeds in soft fruit is that they pass through undigested and then have their own manure in which to grow. Yum, yum:-)

I remember a disused sewage farm we used to play around when we were kids (It's amazing where we found our entertainment in the 50s and 60s!) It had tomatos growing wild. it was only years later that someone told me how they got there. Didn't put ne off tomatos...

Cheers

DeG