Nutrition on the road - What, How and Why?

Have you tried riding after eating loads of bread before? Most people find it just sits in the stomach and is no fun (I used to do long rides with a baguette stuffed in my back pocket). I now go with potato bread which is more dense, but I'd think I'd try and avoid bread if at all possible.

I also agree with ^, and it seems odd that you're talking about nation, vitamins etc, and then going for bread which is junk calories.

I'd also say you're probably over thinking it as suggested up-thread. A couple of years ago I did 650 miles in 9 days, managed to get food poisoning on the first night, threw my guts up, and proceeded to ride ~80 miles on skittles alone.

Also you might find this link useful:
http://cyclingtips.com.au/2013/05/diy-sports-nutrition/

The guy who founded the Vatternrundan literally wrote the book on endurance sports nutrition. On that ride they hand out sweet buns, halved bananas, coffee and fruit juice to help 20k cyclists through 300km. I'd say bread has it's place. I've not tried potato bread though, or really rice cakes either.