Look at pictures of sick people.
Being exposed to photographs of individuals spreading their germs (e.g., via sneezing or coughing) is sufficient to elicit a boost in one’s immunological defense system.
It’s legit. Here’s the study he’s referring to:
An experiment (N = 28) tested the hypothesis that the mere visual perception of disease-connoting cues promotes a more aggressive immune response. Participants were exposed either to photographs depicting symptoms of infectious disease or to photographs depicting guns. After incubation with a model bacterial stimulus, participants’ white blood cells produced higher levels of the proinflammatory cytokine interleukin-6 (IL-6) in the infectious-disease condition, compared with the control (guns) condition. These results provide the first empirical evidence that visual perception of other people’s symptoms may cause the immune system to respond more aggressively to infection. Adaptive…
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