Studies on nostalgia have shown that it's far from a state of mental distress. In fact, it boosts psychological well-being and reduces stress. Longing for the past can be incredibly pleasant; just a taste or smell can cause a cascade of warm feelings. Not only can nostalgia feel good, but it can increase self-esteem, improve one’s sense of belonging, and make people act more generous and open. So go ahead and remember the good old days! It’s good for you.