Why do feel so bad after long easy runs?

lurker wrote:

Too many links! :-) Had to hunt a little, found it:

https://www.letsrun.com/forum/flat_read.php?board=1&thread=246097

Thank you.

Dont do the following if you have abnormality in your kidneys, but we have a world champion nodic skiier who experience something similar. What he does is doing 4 hour slow run before breakfast a few times a year in order to get his body going .

I used to find this and reckoned it was down to three things:

1) My long runs are on a Sunday morning. Saturday night for me involves drinking about 5-7 units of alcohol. Nothing huge (a shared bottle of wine, and sometimes a cocktail afterwards), but it's enough to notice the day after when running, presumably because alcohol affects glycogen storage in muscles. I'm also 43 years old, which doesn't help. In my 20s I'd have barely noticed that amount of alcohol - this comes with age sadly.

2) I'm rubbish in the mornings and my HR and RPE is always higher at a given pace than at lunchtime or in the afternoon and evenings.

3) Not eating extra carbs during the run. I can run at an easy pace for 1hr30-2hr on a light breakfast, but if I have an energy drink with me or a gel, if all feels so much better. It's not just energy either, I think lack of energy when running makes my form suffer, which leads to achey legs afterwards.