So I will be honest I am a senior in chemistry at my local university and I just completed a course on metabolic regulation and we were asked to read this book 'Good calorie, bad calorie' for extra credit (I got it on audiotape because honestly when I am stressed **** reading). Anyway the main premises of the book was that there is insufficient data to demonizes fat as bad and just as much insufficient data to glorify carbs. Currently I think the direction of nutritional sciences is in the way of what is called a paleolithic diet that is the diet on which we evolved on prior to agricultural. We never had fruits and vegetables, or grains year round which is basically saying we were hunter/gathers. There have been several studies on cultures that only eat meat and they are not malnourished or obese (like americans are. and as a quick aside I have never seen a malnourished lion or tiger unless you accout for lack of food). We hear a lot about fish oils lately and how they are good for the heart. The two main omega-3 fatty acids that are recommended for heart health are DHA and EPA. DHA makes up about 80% of brain matter (or is that 80% of the fats in the brain matter). Whatever the main point is that DHA is not only good for the heart but is obviously a major component of the brain and has been shown to be a somewhat affective mood stabilizer. The link between carbs, diabetes and heart diseases is a constantly growing field of research in health and human nutrition and I think it begs the question what is the "correct diet" for humans