Dark chocolate helps with weight loss, and has also been shown to improve memory and cognition. Don’t waste the calories. But buy the best and not white or milk chocolate. There are some companies that produce a chocolate supplement, but I prefer to make my own.
I think the secret to the positive attitude and energy is theobromine (food of the gods). I no longer drink regular coffee, only decaf. Generally, caffeine and theobromine have very different effects on different people. Theobromine is relatively mild and helps elevate serotonin levels producing a really nice side effect of feeling good over a longer period of time. Caffeine is a stronger stimulant and acts relatively quickly as a wake-up drug. Compared to the caffeine, the theobromine has about one-quarter the stimulating power.
Other memory helps, including dark chocolate were listed in my Thursday Thirteen in January 2014.