I have yet to master eating that much at one sitting while riding. I would shake my head in wonderment when riders would sit down at the 200 mile mark and polish off a Whopper, fries and a drink. Brevet people are different.
15 mins after eating that, I set a
PR on a 1/4 mile 16% climb - and felt no ill effects (other than my legs - which were screaming <-Shut up legs!)