Having hundred of combat missions in World War II, Korea, and Viet Nam, he knew about making decisions in high-stress environments.

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Diners haven't been exposed to quality fat in recent years because pigs raised on a bad diet or living in high-stress environments will have yellowish fat that smells putrid.

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Prolonged separation from family and friends back home is a huge source of stress for people in isolated, confined environments, Palinkas said.

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According to Dr Sinclair's theory, which he calls xenohormesis, animals rely on such botanical stress signals to give them extra information about their own environments, in the same way that the alarm calls of one species warn others of danger.

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