Neandertals' main food source was definitely meat

(Max Planck Institute for Evolutionary Anthropology) Researchers from the Max Planck Institute for Evolutionary Anthropology in Germany describe two late Neandertals with exceptionally high nitrogen isotope ratios, which would traditionally be interpreted as the signature of freshwater fish consumption. By studying the isotope ratios of single amino acids, they however demonstrated that instead of fish, the adult Neandertal had a diet relying on large herbivore mammals and that the other Neandertal was a breastfeeding baby whose mother was also a carnivore.

from EurekAlert! - Archaeology http://bit.ly/2ScXYvo