There's a debate brewing over Neanderthal tartar buildup.
And whether an answer may be found in a stomach-churning menu.
Last year, researchers said they had evidence our ancient cousins figured out a balanced diet. The scientists concluded the components of plaque found on the teeth of certain Neanderthals proved they knew the medicinal value of herbs and other plants.
But researchers at London's Natural History Museum have another theory, which they've published in Quaternary Science Reviews.
They suggest the evidence of plants in the teeth of Neanderthals may show they had a stomach for, well, stomach. Or at least the will to eat what was left in the guts of wildlife they hunted.
Eating the food being digested by deer and bison isn't as uncommon as modern squeamish tastes would believe.
Many native peoples, including Inuit tribes, historically ate stomach contents found in slaughtered herbivores, which one researcher explained to the U.K. Guardian, tastes and looks like cream cheese.
In their paper the researchers stated they wanted to explore other options than Neanderthals were ahead of their time in their diet.
But even if they did dine on someone else's dinner, at least modern man can still distance himself.
On Monday, George Washington University scientists released a study finding a search for a common-ancestor linking modern humans with Neanderthals is still elusive, and the lines that led to Neanderthals and modern humans diverged nearly one million years ago -- much earlier than studies based on molecular evidence have suggested.