I see this all over the site, and Mark talks about wanting people to reach their full genetic potential all the time. Specifically, he seems to want to make everyone as healthy as possible with the most palatable diet plan; hence the 80/20 rule. The one thing I've been wondering lately though, is when do I know if I'm where I'm supposed to be with this? I have a basic understanding of epigenetics, which Mark has mentioned is what he means by "reprogram your genes" What I Mean by “Reprogram Your Genes” | Mark's Daily Apple. but it seems to me that it is pretty hard to know if you are expressing the right genes. I also watched this talk by Dr. Doug Mcguff at the 21 convention https://www.youtube.com/watch?v=2PdJFbjWHEU I will quickly summarize the relevant part here since it is so long; he talks about how he (relatively) effortlessly looks the way he does by following primal and lifting weights once (or less) a week and says its because that is his ideal phenotype. He also states when you get to this ideal phenotype (by following his and Marks advice) you may be surprised its not what you want to look like, but you shouldn't attempt to stray too far from it since this is the best phenotype for you. In other words, you will attract more suitable partners looking like the healthiest, best version of you; not striving for a "swimmers body" if yours is completely different. My problem with this is, as I said before, how are you supposed to know if you are there? Or if you need to add in more or less exercise, be more or less strict with your diet, etc? There is a lot of variation even within this community of Mark's recommendations followers, and even McDuff states the exercises he recommends aren't the only ones to do, but are just an example of what you can do. So, how can you be sure?