Anecdotal thought: I have noticed that I feel angry after eating bread. Sounds goofy, but I realized that it wasn't the caffeine from coffee and it wasn't me "not being a morning person". Recognizing this has helped my relationships a surprising amount.
I have a problem with bread too, I start falling asleep for like 5-10 minutes. I think it's either gluten sensitivity or carbs to blame. I try to avoid bread because of this.