Where did you get that part about certain areas being left uneaten?
I read the main summary and the cannibalism section and the only reference to particular body parts was "At first they were so disgusted by the experience that they could only eat skin, muscle and fat, but in the end they also ate hearts, lungs, and even brains."
The survivors had very little food to eat. They found eight chocolate bars, three small jars of jam, a tin of mussels, a tin of almonds, a few dates, some candy, dried plums, and several bottles of wine. They rationed the meager supply of food but it lasted only a week. Parrado ate a single chocolate-covered peanut over three days.
[21][3] Far above the
timber line, there was no vegetation or animals. When the food ran out, they ate the cotton stuffing from the seats and leather from belts and shoes, which made them sick.
[21]
Knowing that rescue efforts had been called off and facing certain death from starvation, the survivors gave each other permission to use their bodies for food in case they died. Left with no alternative, the survivors consumed the bodies of their deceased friends and relatives.
[19][21] Canessa later described the decision to
eat the dead:
The group survived by eating the bodies of their dead comrades. This decision was not taken lightly, as most of the dead were classmates, close friends or relatives. Canessa cut the meat with a shard of broken windshield glass. He set the example by swallowing the first matchstick-sized lump of human flesh. Several others followed suit over the next few days, but a few still kept refusing to eat it.
[3]
Parrado protected the bodies of his mother and sister so they would not be eaten. They dried the meat from the bodies in the sun to make it easier to eat. At first they were so disgusted by the experience that they could only eat skin, muscle and fat, but in the end they also ate hearts, lungs, and even brains.
[25]
All of the passengers were
Roman Catholic. Some feared eating human flesh would lead to eternal
damnation. According to Read, some survivors compared it to
the Eucharist, i.e. the conversion of bread and wine into the Body and the Blood of
Jesus Christ. Others cited
John 15:13 from the
Bible to justify it: 'No man hath greater love than this: That he lay down his life for his friends.'
All who survived the ordeal made the decision to eat human flesh, though not without serious reservations. Some, including Coche Inciarte and Numa Turcatti, only ate the bare minimum necessary for survival, due to their deep revulsion.
[26] Javier Methol and his wife Liliana, the only surviving female passenger at the time, were the last to eat human flesh. Liliana had very strong religious convictions against doing so and only reluctantly agreed to eat after someone suggested that doing so was akin to receiving the
Holy Communion.
[27][28]