Big Think
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The chemical reason love makes you irrational
Posted
June 4, 2026
Views
19,563
Likes
964
Comments
25
Engagement
5.06%
June 4, 2026
19,563
964
25
5.06%
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3:00Now PlayingWe created this video in partnership with Unlikely Collaborators.
Why does love make rational people obsessive? Meghan Sullivan, PhD, Helen Fisher, PhD, Gail Saltz, PhD, and Ted Fischer, PhD, trace love through the brain systems that shape reward, stress, attachment, and desire. But chemistry is only the beginning. Love may also be a moral practice: a way to pay attention, challenge bias, and ask what it really means to care.
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