[richcollins]

By analyzing plant remains in the cave, Humphrey's team found that residents ate lots of a particularly sweet type of acorn, which becomes soft and sticky when cooked. They also ate wild oats and legumes. Such foods can lead to serious decay,

[refurb]

Yes, and wild oats and legumes don’t exactly seem like the exception in ancient diets.

Plus another link in this thread claims ancient fruits have different sugars that don’t cause decay.