I've spent the better part of the last 20 years competing in endurance races. I've studied sports nutrition for the last 15 years. There has always been the "new" science. In the 80's it was low-fats/high-carbs. In the 90's it was high-protein/moderate carbs and fats. More recently it has been no sugars (including bread). Now we are onto the Paleo Diet (for athletes). Unfortunately, they are finding now that sports performance is decreasing on a Paleo diet because the carb ratio is generally too low.
Gimme a break. I have incisors
and I have molars for a reason. And, they take up pretty much the same proportion of space in my mouth. So, I eat a balance diet of 55%-60% lean proteins and about 25% carbs and 20% fats. I also eat "low to the ground," eg Froot Loops, Big Macs, Cokes, french fries, and cinnamon buns don't grow on the farm so I generally don't eat them.
Your mileage may vary.
GS