India is facing a dual burden of malnutrition (undernutrition and overnutrition) and the prevalence of obesity is continuously increasing. Obesity invites many comorbidities like type 2 diabetes, cardiovascular disease, obstructive sleep apnea, and cancer. Considering all of these issues, efficient weight loss has evolved into not only a high priority, but also a critical requirement for overall health and well-being. Nowadays ketogenic diet (KD) has become very popular for weight loss. Here different KD types are introduced and listed with details, including classic KD, medium-chain triglyceride diet (MCTD), modified Atkins diet (MAD), The High-Protein Ketogenic Diet (HPKD), Cyclical Ketogenic Diet (CKD) and more. The proportion of fat, protein and carbohydrate is different in modified ketogenic diets than in a classical ketogenic diet. Furthermore, KDs work through hormonal influence on appetite, altered lipid processes, improved metabolic efficiency, higher rates associated with gluconeogenesis, and enhanced protein thermic effects. Short-term weight management effects are evident, but long-term outcomes are uncertain. Randomized population studies, prospective longitudinal studies, proper correlation with regular diets, and even some doubts about the keto diet's safety are lacking. In addition, the lack of adequate diet subtypes, as well as having numerous labels for keto diets that follow the same principles, makes distinguishing between the different types of KDs and their therapeutic effects more difficult. This review also emphasizes on continuing a healthy lifestyle a for long-term normal body weight maintenance after weight loss. Lastly, to learn more about the true potential and safety of these diets, more research is strongly recommended.