I actually have the completely opposite problem.

If I start my day producing, (which I often do). I get too distracted doing work to eat until well after lunch time.

One of my new years resolutions was to eat breakfast more often. So if I want to do things that aren't work, I basically have to force myself to not open my laptop until I've completed them. I.e. if I start the day doing work, the odds of be going running diminish quite a bit, as does the chances that I'll eat breakfast.

As a caveat, I am not doing that much writing for external audiences, I could imagine some benefits to starting writing first thing in the day before their are as many distractions.