The Confederates couldn't even feed their own front-line troops, so Andersonville doesn't surprise me; The Federal POW camps don't have that excuse.
The following is an excerpt from DIARY OF A TAR HEEL CONFEDERATE SOLDIER. Its a very interesting read.
Location – Federal POW Camp
May 26 - Received two letters to-day, one from home and one from my brother Pincus, who went to Washington on his way to visit Morris and myself, as he has to get a pass from headquarters before he can see us. He was refused and returned home. Our daily labor as prisoners is that at 5 in the morning we have roll call; 6, breakfast, 500 at a time, as one lot gets through another takes its place, until four lots have eaten; we then stroll about the prison until 1 o’clock, when we eat dinner in the same style as breakfast, then loaf about again until sundown. Roll is called again, thus ending the day. We get for breakfast five crackers with worms in them; as a substitute for butter, a small piece of pork, and a tin cup full of coffee; dinner, four of the above crackers, a quarter of a pound mule meat and a cup of bean soup, and every fourth day an eight-ounce loaf of white bread. Nothing more this month.
June 8 - There is nothing new up to to-day, when I received a box of eatables, one or two shirts, and one pair of pants from home. The only way we can pass our time off is playing cards and chess. Six hundred prisoners came in to-day, with them a lady, who is an artillery sergeant. Being questioned by the provost marshal, she said she could straddle a horse, jump a fence and kill a Yankee as well as any rebel. As time in prison is very dull and always the same thing as the day preceding, I shall not mention each day, but only those days upon which something happened.
June 11 - Five hundred more prisoners came in to-day.
June 12 - To-day, as the negro guard was relieved, two of them commenced playing with their guns and bayonets, sticking at one another. Fortunately one of their guns, by accident, went off and made a hole in the other one’s body, which killed him instantly. The other one kicked at him several times, telling him to get up as the rebels were laughing at him, but in a very short time he found out that he had killed his comrade and that we were laughing sure enough.
July 4 - Four hundred prisoners left here for some other prison, as there were too many here.
July 29 - There are at present some 3,000 prisoners here. I like this place better than Point Lookout. We are fenced in by a high fence, in, I judge, a 200-acre lot. There is an observatory outside, and some Yankee is making money, as he charges ten cents for every one that wishes to see the rebels.
October - We have got the smallpox in prison, and from six to twelve are taken out dead daily. We can buy from prisoners rats, 25 cents each, killed and dressed. Quite a number of our boys have gone into the rat business. On the 11th of this month there were 800 sick prisoners sent South on parole.
November and December - Nothing, only bitter cold. We dance every night at some of our quarters. Some of the men put a white handkerchief around one of their arms, and these act as the ladies. We have a jolly good time.
Diary in Full
http://docsouth.unc.edu/fpn/leon/leon.html
But the elite planter class, the guys most responsible for the rebellion, fattened their waistlines and bank accounts while the poor soldiers doing the fighting for them starved. That was one of the most inexcusable features of the Confederacy.