He mentions it several times, and claims that Americans, Indians, Indo-Chinese and Chinese people among many others were eaten.
He also claims
These are some serious -- and seriously fucked up -- allegations, so I'd love more info from historians.
Edit: More info on allegations here https://www.reddit.com/r/AskHistorians/comments/3ribf6/according_to_anthony_beevors_the_second_world_war/cwoadyo
Edit2 a clearer question with help from /u/jschooltiger
"Why were reports of Japanese soldiers cannibalizing American POWs suppressed by the allies after WWII? And what reaction was there when the information was released?"
Can you clarify specifically where in Beevor you're pulling these allegations from? Cannibalism was definitely an issue, but some of these accusations seem extreme.
mad as hell about it
Take this with a grain of salt and I'm hoping somebody else with more experience answers. But I'm reading Iris Changs:The Rape of Nanking. And it is stated that a lot of japan's atrocities are overlooked because the U.S. and even China wanted them as an economic ally after the war. I will try to post the quote after work. Perhaps it's something similar to that extent?
Are there instances of cannibalism occurring in the armies of the other warring states?