This is interesting. I, too, have trouble keeping my HR down and sometimes have trouble "hitting the wall," although not as much lately. I was tested for diabetes a year and half ago and found out that my blood sugar tends to stay at the low end of normal. Maybe I use up glycogen quickly in a similar way. What works for me is consuming Gu in smaller increments more frequently than is recommended. It seems to keep my energy level steady.
For a first a.m. run, I usually eat half a banana 10-15 minutes before starting and that seems to work. Haven't paid much attention to what I eat the night before, but that tends to be my most balanced meal - ?
Guess we're all different. Hope you find something that works for you.
Deb




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