No question that what you eat can affect how you feel, right?
I know it effects me big time! I don't know why but it took me YEARS of trial and error and becoming extremely self-aware of how I felt if I ate certain foods and took certain supplements.
If I eat too many carbs or sugar without protein and fat to balance it out, I feel jittery, then I have a "crash" afterwards. I also get hangry which is not a pretty sight! Also, if I don't take my supplements, then I start feeling fatigued, anxiety-ridden and don't have as much energy.
Plus I am VERY sensitive to caffeine and alcohol. If I drink coffee, I am a total and complete mess afterwards and I feel like jumping out of my skin. If I drink alcohol, even just one glass of wine, then I feel awful the next morning.
The funny thing is that I ignored all of the physical and mental signs for a very long time and just ate and drank what I wanted. My motto was "moderation is key" but that didn't work for me in the end.