Biologically and psychologically, "love" in 2026 is understood as a three-stage neurochemical process. The initial "lust" phase is driven by testosterone and estrogen. This transitions into "attraction" (the "honeymoon phase"), which feels like an addictive rush; the brain’s reward system is flooded with dopamine and norepinephrine, causing euphoria, "butterflies," and decreased appetite. Interestingly, serotonin levels drop, which can lead to the "obsessive" thinking typical of new lovers. The final stage, "attachment," feels like profound calm and security, driven by oxytocin (the "cuddle hormone") and vasopressin. This phase feels less like a "spark" and more like a "grounding." Psychologically, love feels like "self-expansion," where another person's interests and identity begin to merge with your own. In 2026, researchers also emphasize that love feels like "emotional safety"—the physiological state where your nervous system co-regulates with another's, lowering your heart rate and cortisol levels simply by being in their presence.