[roots]

Interesting question.<br><br>
Generally speaking, I think that you should use the fueling concepts/methods that got you through your training. If it worked to get you through your long runs and long quality workouts, then it should work for you on race day. This late in the training cycle is probably not the time to start experimenting with new methods.<br><br>
In my experience, it took me several marathon races to get an understanding of the carb-load and hydration. Early-on in my marathon career, I was really under-loading (even when I thought I was over-loading,) which resulted in my inability to run at full capacity.<br><br>
Regarding junk food...sure, replacing the junk with a healthy balance of carbs, fats, and protien can do nothing but help you. But IMO, an effective carb-load in the 48-72 hours prior to race can have a more dramatic impact on the outcome of your race.<br><br>
You should feel relaxed as possible you approach race day. If eliminating all junk food would cause a level of stress or unhappiness, then I do not suggest going cold turkey!<br><br>
Good luck with the taper and best of luck as you approach the race.

 

[roots]

For me, there is a difference in nutrition tactics for ultras vs. marathons.<br><br>
I like the "blocks" for their ease of transportability and lack of mess, however, I cannot chew/digest them while running at marathon race pace. Thus, I use gels for the necessary carb replacement.<br><br>
Touching on the alcohol subject, I maintain that if I am sufficiently hydrated that 1-2 beers the night before race does not hinder performance. I feel it helps to relax and assists with falling asleep. In the big picture though, I cannot make a case to promote alcohol consumption as a measure to improve race performance.