Sorry if this has already been stated, but I skipped the last couple of pages. I just wanted to offer my two bits after 40 years of riding, racing, randonneuring, etc:

What has worked for this sample of 1 is the standard balanced diet according to what the government nutritionists have pretty much been repeating for years. My official Latin motto has always been, "medio tutissiumus ibis." Always take the middle path. Moderation in all things.

If you do a lot of cycling, what confounds diet is the corresponding efficiency one gains from all that riding. I have noticed that there are quite a few "overweight" riders out there who can still ride very well - hard, fast, and long. The only conclusion that explains this is that their bodies have become so efficient at cycling that they need less food, yet they keep eating the copious quantities their bodies have become used to. This could explain why eating less carbs and more fats appears to work. Your body no longer needs as many carbs; it just stores the extra as fat anyway.

I'm 6'1" and 175 lbs, and I have found that over the past few years, my body has become so efficient at cycling longer distances that I am able to go on long rides, on a standard "4 basic food groups" diet, without bonking, even if I tried. I did a couple of double centuries in California the last two weeks, and I started them without having breakfast. I wasn't even hungry at the first rest stop (but yes, I was pretty hungry at the last one! But nowhere near bonking!

So this is just to say that your body will look after you as long as you don't go to extremes. Yeah, riding a 3-week stage race is probably an extreme, but I don't think pro's adopt fad diets. They just eat very well. The human body is extremely good at adapting, so I think that the less you try to mess with it, the better.

Luis