<p>This narrative review explores the growing interest in vegetarian diets, driven by increasing awareness of health, environmental sustainability, and disease prevention. The rising popularity of vegetarianism stems from its recognized health benefits, including reduced risks of chronic conditions such as obesity, diabetes, and cardiovascular disease. While vegetarian diets have demonstrated potential in supporting overall health and longevity, concerns about nutrient deficiencies must be addressed through careful dietary planning. The review also examines the intersection between vegetarian diets and athletic performance, highlighting both the potential advantages and challenges for athletes. Plant-based diets may enhance endurance performance and positively influence gut microbiota; however, concerns remain regarding the adequacy of nutrients essential for strength and power-based sports, such as protein, creatine, and iron. Emerging evidence suggests that, when properly planned, vegetarian diets can effectively support athletic performance by ensuring adequate nutrient intake. By synthesizing current research, this review seeks to provide insights into the implications of adopting a vegetarian diet for general health and physical performance. It offers a balanced perspective on the benefits and potential limitations of vegetarianism. Future research should further investigate the molecular mechanisms through which vegetarian diets influence metabolic pathways and exercise-related responses, to better understand their long-term impact on athletic performance.</p>