I would get like that on low-carb diets, and I am by no means an angry or stressed person (tend to be too chill), so perhaps it just has to do with the carbs. I also happen to love carbs and would be fine eating pasta/bread every meal of every day
Of course, I woudlnt' be so happy with how I looked/felt.
Still, when I was on the low-carb diet(s), I *needed* caffeine, otherwise I could barely make it through the day. Then again, I never really felt that low-carb diets were meant for athletic people, and I tried these diets while spending the summer in Hilton Head Island, SC, playing tennis in the middle of the day in the heat, or going to the gym, so I probably needed those carbs....to make matters worse, I had to work my retail job, dealing with stupid, "princess-like" tourons (tourist + moron), so the job was that much worse.