I would definitely decide on food, because you have more energy because your body is containing a lot of protein and starches that are giving your body strength to move on. Coffee on the other hand will energize you but at some point it will stop helping. In middle school I had an english teacher who told me that when you drink coffee in the morning your brain tends to not work as it usually would. So that wouldn’t be a good idea for some of us. But it is a great helper after you wake up and have a hot cup of dark coffee. Based on the article, I read that the soldiers wouldn’t cook because usually the females would do that for them but the way they kept themselves with energy was eating proteins and starches as an example of potatoes and meat.

Skirt Steak & Mashed Potatoes