Eating humans, called "cannibalism", has generally been associated with religious ritual or extreme hunger. In either case culinary considerations are rather secondary. False accusations of cannibalism have been common throughout history as a means of de-humanizing some population that was not liked or to justify exploiting or destroying that population. Even reports of ritual cannibalism by the Aztecs are highly questionable.

The only reasonably reliable report I know of as to taste and texture of human is that of New York Times reporter William Seabrook. He reported it was very much like veal, a little tougher, a little stringier and with a somewhat more mature flavor (slightly closer to beef than commercial veal is).

Health Considerations

Humans are essentially wild animals, not raised under the tightly controlled conditions typical of our industrialized agriculture. They are free to contract various diseases and many of these diseases are 100% transmittable to other humans who consume them.

Among these diseases are Trichinosis, Hepatitis and HIV (AIDS). Trichinosis is more widespread than most people realize because it is often asymptomatic, but AIDS is a much more serious risk. Many other more or less severe diseases and parasitic infections can be contracted.

Human should always be well cooked to an internal temperature of at least 165°F/70°C before consuming and brains should probably be avoided altogether (unless you are already a zombie).