I know, Fabulous Traveler, that sometimes you just don't have time to prepare a proper breakfast, but this should never be a reason to skip it.
There are always instantly available options.
Apples and Bananas
What can be quicker than putting a banana or an apple into your bag and eating it on the way? These two fruits have a low glycemic index, which means that they will sustain you with energy throughout the day. Contrast this to a muffin, which will give you a spike of energy for around 30 minutes, and then you'll feel a crash.
Energy and Protein Bars
Read the nutrition label when buying these, and watch out for those that contain fat and sugar. Don't buy candy bars, but energy bars.
Keep an ample supply of almonds, raisins, pumpkin seeds, and dried cranberries. All these provide a steady source of energy. You can put them in a box and grab a handful when you don't have time for breakfast.
Not Hungry in the Morning?
What if you're not hungry in the morning Fabulous Traveler? If you're a night owl, you generally won't feel hungry in the morning. I used to be like this, but once I got into the habit of eating breakfast, it just became something I absolutely needed.
Start with a light breakfast, in that case. Even a handful of mixed nuts will do.