I just don't believe any relatively normal way of eating/living guarantees either good or bad health for a particular individual. Even if you live PERFECTLY, you might die of cancer. Even if you live dramatically imperfectly, you might live to a ripe old age.
Your friend overestimates the theoretically increased risks of what he thinks you should start or stop. You likely overestimate the protection of primal (as do I). Sounds like you're doing the right thing in the circumstances--leaving each other alone to your own choices. You'll only know at the pearly gates who "won" in terms of longevity
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food