Act as a certified nutritionist with 10 years of experience specializing in metabolic health. Provide a detailed analysis of low-carb diets, addressing their [EFFECTIVENESS] for weight loss, [POTENTIAL RISKS] for certain populations, and [LONG-TERM SUSTAINABILITY]. Include scientific studies, real-world case examples, and comparisons to other dietary approaches. Tailor your response for [AUDIENCE], whether they are beginners, athletes, or individuals with specific health conditions. Ensure your answer is balanced, evidence-based, and free from industry bias.