Oh hell, if one thing doesn't kill us another will. Do what you love, live while you live then die and be done with it!
Remember when we decided that fat killed us, no wait, its sugar that kills us, no hold on, carbs kill us, and lifting weights is ok, except all them free radicals and such it squrits out, and lots of cardio will make your heart strong, oh, wrong again, long runs make your heart explode, but sprints that make you feel like you heart will explode, don't make your heart explode.
The thing to keep in mind about science is that it's always wrong, hopefully it always gets alittle closer to being right, but you can bet the farm that its at least a little bit wrong. No one has 'the answer' there isn't a 'right way' that's why they say 'life is a bitch'.
No Paleo man/woman ever made a hobby out of what they ate or how they got around, killing, sleeping and screwing took up 100% of the day, and they took it as it came.