The medical condition in which excess body fat accumulates in the body such that it has a negative impact on human health is known as obesity. It is the condition that is characterized by a body mass index or BMI that exceeds 30 kg/m2. It can occur due to excessive food intake, genetic susceptibility and lack of physical activity. Certain endocrine disorders, mental disorders and medications can also cause it. It has a negative effect on the health as it enhances the likelihood of developing various cardiovascular diseases, type 2 diabetes, osteoarthritis, depression, cancer, etc. The management strategy of obesity is generally by making committed life style changes, adopting a diet and exercise regime and through appropriate medication. This textbook is a compilation of chapters that discuss the most vital concepts in the field of obesity. Different approaches, evaluations and methodologies on the assessment, impact and management of obesity have been included herein. This textbook is a complete source of knowledge on the present status of this important field.