Although I agree with you that the vast majority of the forum topics on this site are totally lame, there are a few with some depth and intelligence....I just ignore those "Who would you like to have a 3 way with on RJ
However, maybe the silence in regard to nutrition and fitness is because if you go to the home page and look up toward the top center/left of the page, there is a box that provides links to tons of workout plans and even great meal plans!
This site is more than just about the forums....its FULL of great articles, ideas, motivational pieces, even great instructional videos...
Have you checked those out? I refer my Clients (I'm a personal trainer) to this site all the time for ideas for better health and fitness!
Like I said, there is SO MUCH more than the forums on this site......so much more.