News Life Human cancer cells might slurp up bacteria-killing viruses for energy Lab-grown, mammalian cancer cells that ingested these viruses shows signs of cell growth Bacteriophages were long thought to only interact with the bacteria they infect. But recent research has shown they can be ingested by human cells, and now there is evidence that our cells can use them as a food source. This illustration shows bacteriophages interacting with mammalian cells. T2Q and Barr Lab (CC-BY