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Research on loneliness findings

Research showed that after social isolation, subjects' brain scans showed more activity in the midbrain when shown pictures of social cues.
When subjects were hungry but had not been socially isolated, they showed a similar reaction to food cues, but not social ones. This shows that the drive for social contact and for things like food seems to be represented in a similar way.

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created an idea from a article:

TECHNOLOGYREVIEW

Why do you feel lonely? Neuroscience is starting to find answers.

technologyreview.com

MORE IDEAS FROM THE SAME ARTICLE

Loneliness is subjective

It's possible to be completely isolated and feel invigorated.

Detecting Loneliness

Scientific literature has linked loneliness to depression, anxiety, alcoholism, and drug abuse.
Loneliness makes you more likely to fall ill by suppressing healthy immune function.
Biochemical changes from loneliness an accelerate cancer, heart disease, and Alzheimer's.

Measuring loneliness

Objectively measuring loneliness in the brain, as opposed to asking people how they feel, could give clarity on, for example, the connection between loneliness and depression. It could also shed some light on addiction.