I like a little of both I have to say. Sometimes my gut instinct says, 'That was not around in Paleolithic times, so therefore what are we doing to ourselves by eating it/doing it?' and other times I really need the science to tell me WHY?
I am not a scientist nor a scholar, I am a mother who has been searching for a very long time for a better way to 'be'. Sometimes it feels like groping around in the dark, like trial and error and the science - in some cases - can be really contradictory and confusing, like 'information overload' when I get into heavy research about something.
In light of this, I like to keep up with what people are saying about it, through discussions like these. Sometimes it can make things just a little clearer and hanging out at a place like this means that I can pick up snippets of layman's science and listen to other people's experiences too. I think reading what other people have been through is sometimes just as valuable as scientific evidence. Together they are a powerful combination and when the experience gets backed up by science, well then that is the EUREKA! moment.
I guess I won't try anything new until I have read at least some scientific evidence on the topic, some anecdotal evidence (discussion or opinion) and some historical /anthropological evidence about how pre-industrialized/agriculturalized people lived. I have to admit that it is the actual historical evidence that usually helps me make my final decision as to whether I accept the hypothesis or not.
But then, after all this I always listen to the last and most important judge - my body - in the form of emotional and/or physical gut feelings. My body is where the buck stops, regardless of science, history or word-of-mouth - period.