When I started noticing that, I started carrying a Gu with me for any run where I might be over an hour. I keep it close to the skin in cold weather to make it warm enough. :-)
(Sport beans or some other source of quick energy/sugar are comparable.)
...and you probably already know this, but start eating the Gu or whatever *before* you feel tired -- like at 45 minutes in. I like Larabars. :-)
Thanks, bbrooke and Janet for the reminders. I always carry food with me (and take some at 45 minutes) when I'm at national events, but I don't always remember to do it at local events. I'm also struggling to find the appropriate "food" since I no longer eat sugar. I've tried nuts and raisins, but I don't know if that is fast-acting enough. bbrooke, do Larabars work well for you? May have to give them a try.
Melissa often uses raisins to treat low blood sugar, especially while running, hiking, and orienteering. They aren't going to work as fast as glucose tablets but I imagine eating a few periodically would work quite well in keeping a bit of sugar flowing. And they are wayyy cheaper...
Yes, I like Larabars. They have very simple "real" ingredients with no added sugar (they're mainly just dates, nuts, and one or two other ingredients), and they're often on sale at King Soopers (Kroger) for $1 each. I like them a lot more than Clif Bars or Power Bars.
I would call the Larabar flavor names "aspirational" (banana bread? peanut butter cookie? pecan pie? maybe not exactly, but they taste fine).
For my trail half-marathon a few months ago I did lots of online research about fueling, and (for convenience & taste & energy) I settled on eating a 1" chunk of a Larabar about every 15-20 minutes during the race. :-)
Thanks bbooke, I'll give them a try.