Does being happy make us less likely to get sick?

“Laughter is the best medicine”, so the old saying goes. But is there actually any truth to that - could we be less likely to get sick if we’re feeling positive about things? Well, psychoneuroimmunology research has shown that chronic stress, anxiety and depression all weaken the immune system. And the main culprit is stress hormone cortisol. When levels are too high, it disrupts sleep and undermines immunity, affecting our mood and more broadly, overall health. How does that work? …