Cocoa has one of the highest content of Magnesium or 'The Mind-Altering Effects of Chocolate'

"...Results showed that eating high cacao content chocolate – 60% cacao – made the brain more alert and attentive.
The chocolate also increased blood pressure for a short time even though in the long run chocolate is known to be a vasodilator. It widens blood vessels and lowers blood pressure.
The authors noted that an earlier meta-analysis of randomized controlled trials had shown that over a two week period cocoa can lead to significant decreases in systolic and diastolic pressure. Those decreases translate into a 20% reduction in strokes, a 10% reduction in coronary heart disease, and an 8% decrease in all-cause mortality.[ii]
In one study of 470 elderly men, those who ate about 2.3 grams of cocoa powder per day over five years had significantly lower blood pressure translating to a 45-50% decrease in cardiovascular and all-cause risk.[iii]
The authors attribute the vasodilation effects of chocolate to an increase in nitric oxide induced by the cacao flavanols....”

learn more: http://www.greenmedinfo.com/blog/mind-altering-effects-chocolate

http://nutritiondata.self.com/foods-000120000000000000000-w.html

Need to do something important this afternoon? Don’t take any chances – eat chocolate first.