Here is a little bit from the article-
"How does olfaction - our sense of smell - reveal our prejudices? The authors of the new study note that neuroscientists have found that what we see and what we smell, when presented together, often get tied closely together in the hippocampus, a brain region that plays a key role in learning and memory.
The study's lead author, Incollingo Rodriguez, said some people were overtly biased, but others might not even be aware they harboured negative feelings towards heavy people.
Many believe the first step towards addressing unconscious prejudice is to unmask it: to make the implicit explicit."