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Junk relationships are people/groups who you have little face-to-face contact with and/or little mutual trust, who bring out your insecurities and consistently make you feel worse about yourself or the world.
Nutritious connections are people/groups who you have frequent face-to-face contact with and/or a lot of mutual trust who make you feel better and help you grow.
The same way the consumer economy of the 20th century called upon us to invent the nutritional diet, I believe that the attention economy of the 21st century calls upon us to invent an attention diet.