Good morning,
Seriously, it's not something to worry about for two reasons.
......It's a sporty cyclist's affliction......
Generally I would agree, but, and isn't there is always a but? :-)
A few years back I used to commute to work 17 miles there and another 17 back and once or twice I recognised the signs of low glycogen, but knew what they were so I never got to total depletion.
If you commute/ride/exercise 5 days a week plus some other exercise it is fairly easy to hit depletion on Friday morning especially if you don't have breakfast.
You only need to be short by a couple of hundred Calories a day of carbs/protein to wake up on Friday morning to find that all of your liver glycogen was used up keeping you alive over night and some of you glycogen capacity being in upper body muscles is not available to your legs.
So you get half way into your commute and oohps all liver glycogen gone as well as the not completely replaced glycogen in you legs as you weren't eating quite enough for the last five days.
The old solution was a can of Coke and a Mars bar, but Mars bars are much smaller nowadays and a lot of places have stopped selling fizzy drinks with sugar to keep the price down. Thanks sugar tax.
Bye
Ian