This report provides a comprehensive analysis of the impact of emotions on psychological health, drawing on both experimental and non-experimental studies. The experimental study, involving participants from Giessen University, investigated how emotions affect logical reasoning, revealing that negative moods and anxiety impaired performance while positive moods enhanced it. The non-experimental study critically examined previous research, highlighting strengths and weaknesses in the methodologies used to assess the relationship between emotions and psychology. The studies employed various methods, including mood manipulation and analysis of problem content, to understand how emotional states influence cognitive processes. Findings indicated that the diversity of emotions experienced by individuals, as measured by the Shannon-Weiner index, correlated with physical and mental health outcomes, although the index itself was subject to limitations in capturing the full range and evenness of emotional experiences. The report concludes that emotions significantly influence decision-making, thinking, and problem-solving, with implications for cognitive reasoning and therapeutic interventions.