and going without breakfast is not good so you are right there! how much yoga are you doing and what kind of practice will dictate what/when you eat. I find I can easily do a short 7-10 min wake up practice on an empty stomach, but then need a few hours after a meal to do a full on practice.

for your weekends, I would recommend skipping the coffee and going with a two part breakfast...something to literally break your fast (toast or fruit) that is light and then your more leisurely breakfast following your practice. regardless, I have found that coffee, tea or (ugh!) citrus juice before a practice never turns out well!