I think that generally speaking what you're saying is accurate, but it does depend upon what you do during the day.
I used to run 6 miles every day at lunch (this was when I worked down in Mill Valley/Sausalito so running was fun) and I could eat lots of whatever I wanted - and I did.
How I miss May Lee's kung pao chicken, San Jose La Taqueria (on 4th street San Rafael?) chorizo super burritos, Dave's quesadillas and tamales in Corte Madera, and Max's fries and caramelized brie sandwich.
That stuff would give me a heart attack just looking at it now since I only run when chased by very slow monsters now...
BTW, if you loved Max's on Sundays like I did, I hear it closed.