The idea of knowing the optimum diet for humans is exciting. I used to spend a lot of time reading these studies, then I realized that like many other people I know, we read and pontificate these points to everyone else we know without actually putting them into practice to a level that makes spending so much time reading about them worthwhile. This is why I rarely look at diet and nutrition articles.
I'm sure some of you do follow them, but is being obsessive over everything you put into your mouth going to make your life significantly healthier and longer than just following the general principles we've established? I mean, I go shopping and buy fruit, vegetables, meat and some grains. I get my macronutrients and exercise frequently. Will I gain a decade of good health if I start doing paleo? I doubt it. Do I reduce my risk of preventable death if I follow religiously the latest diets (there's at least one every six months that everyone at works will tell me about)? Not likely.
Sorry if it sounds like I'm dismissing nutrition research, I know it's important, but if you're spending hours talking about whether a 30:30:40 ratio is better than a 20:20:60 ratio, then you eat dessert after every meal and get drunk every weekend, I think you'll find better things to spend your time on.
There's currently a group of anti-carbs lobbyists. The pro-carbs is not as vocal, but they have equally strong evidence that eliminating carbs isn't as important as you may think.