“Laughter is anti-inflammatory”
Reasonably well supported. Research suggests laughter reduces cortisol and certain inflammatory markers. It is not a medical treatment but the physiological effect is real.
“Crying is regulating”
Well supported. Emotional tears contain stress hormones that the body is literally shedding. Most people feel a genuine physiological calm after crying — that is not imagined, it is the nervous system returning to baseline.
“Hugging is immunoprotective”
Fairly well supported. Physical touch triggers oxytocin release, which has measurable effects on stress hormones. A Carnegie Mellon study found people who received more hugs were less susceptible to illness.
“Singing is vagal toning”
Accurate and underappreciated. The vagus nerve runs through the vocal cords and throat. Singing, humming, and even gargling genuinely stimulates it, which activates the parasympathetic nervous system and promotes calm.
“Dancing is neurogenic”
Interesting claim. Neurogenesis means the creation of new neurons and it is stimulated by aerobic exercise, coordination, and rhythm. Dance combines all three, so this has a reasonable basis. Also, learning new skills, a diet rich in flavonoids, and restful sleep promote neurogenesis.
“Joy is a biological necessity”
The body does not treat joy as a luxury. Positive emotional states have measurable effects on immune function, cardiovascular health, healing rates, and longevity. Chronic joylessness is genuinely harmful physically, not just emotionally.