A study on Epstein-Barr virus showed that in Samoan culture, higher socioeconomic status led to more stress and viral reactivation, the opposite of the effect seen in Western cultures.

The endorphins released from enjoying a meal at the table can directly alter the function of your immune cells, which have receptors for these feel-good hormones.

According to research from Stanford's Fred Luskin, holding onto anger can negatively impact biology, and practicing forgiveness has been shown to lower high blood pressure when other lifestyle changes fail.

Certain personality types, such as neuroticism, are linked to higher levels of C-reactive protein, a key marker for inflammation in the body.

Similar to the animal kingdom, being of a lower socioeconomic status can itself be a source of chronic stress and inflammation, independent of diet or lifestyle access.

Research shows the immune system can be conditioned, like Pavlov's dogs, to have a biological response to a neutral stimulus like a taste or a smell.

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Anger is thought to prime the immune system for potential physical damage, an evolutionary response because anger often preceded violence.

Food sensitivities may not be a reaction to the food itself, but rather a reaction to eating while in a stressed state, which significantly alters digestion.