The nutrient often referred to as the "feel-good" nutrient is serotonin, primarily derived from the amino acid tryptophan. Tryptophan-rich foods like turkey, nuts, and bananas can help boost tryptophan levels, promoting serotonin production in the brain. This nutrient is crucial for regulating mood, emotions, and sleep cycles, leading to feelings of well-being and happiness. Adequate levels of serotonin are vital for mental health and can play a role in preventing depression and anxiety.