There's a lot of media out there about how allied soldiers were treated by axis forces when held prisoner in POW camps. But how about the opposite, how were Axis (German, Italian, Japanese, etc.) troops treated in Allied POW camps during the first and second world wars? And are there any tv shows/movies/books that give an honest interpretation of this?
Mixed; incredibly mixed. German POWs caught near the end of the war often went through hell out of the sheer strain of dealing with the volume of them.
POWs taken Stateside or to Canada were treated remarkably well indeed, and had frequent access to the International Red Cross to help arbitrate and mediate disputes; fully in line with convention standards that time. POWs in Britain often had to contend with a bit of malnutrition; unsurprising for a country on a strict rationing regime. Its hard to pin exact numbers that died from malnutrition, but there are undoubtedly cases.
Late war, especially after the Ruhr pocket was closed and Model committed suicide, the Americans had more POWs than they could physically process. Many were enclosed in the Rhine "field camps"; which were often fully exposed and only surrounded by a thin wall of barbed wire. The crowded conditions caused the 'disarmed combatants' (a euphemism used to avoid calling them POWs) to suffer from exposure and made organized feeding nigh impossible. Its the logistical fallout of taking near two million men prisoner in less than a month and a half of fighting. Estimates of German dead are still hotly disputed to this day.
Out East, the short answer is that the Germans gave as good as they received. The horrific, often deliberate, treatment and death marches awarded to Soviet POWs was a treatment often returned with a vengeance by the RKKA when they began to push the Germans out of the Soviet Union and into occupied Poland. German POWs were often brought on something akin to death marches when captured by Soviet forces, and the relative apathy shown by NKVD and RKKA camp organizers towards providing basic sustenance for the masses of German POWs rivals only the apathy shown by German camp organizers to the millions of POWs taken in the year 1941. Needless to say, many Germans who marched East into captivity, never marched back West again. This is only exacerbated by a post-war 'Witch Hunt' enacted by the Soviet government that found (rather, created) reasons to keep German POWs in labor camps; a famous example being the ace pilot Rudel being charged with 'Destruction of Soviet military property'; in other words being condemned for doing what he was expected to do as a Luftwaffe pilot. Naturally the trial was a farce, and it took incredible international pressure to secure the delayed release of him, and many like him, in the mid 1950s.