To me nutrition feels so complicated these days in that pretty much everything that you could think to eat has a bunch of detractors claiming there's reasons why it's unhealthy. I found a video recently listing something like 6 reasons why oatmeal is unhealthy.

With that said, for the last few years I've found a few things that work for me that I've incorporated into my routine. In the morning I'll eat a naval orange and drink green/black tea with a bit of honey and cream. Later I'll have some store bought guac and Costco Mary's crackers. Sometimes I'll have add some Kimchi, feta cheese, fresh vegetables, hummus. Costco frozen fruits are nice too for smoothies or just plain snacks.