The markedly high prevalence of Obesity contributes to the increased incidence of chronic diseases, such as diabetes, hypertension, sleep apnea, and heart disease.Because of high prevalence of Obesity in almost all countries, it has been the focus of many researches throughout the world during the last decades. Along with increasing researches, new concepts and controversies have been emerged. The existing controversies on this topic are so deep that some researches argue on absolutely philosophical questions, such as “Is Obesity a disease? ” or “Is it corrects to treat Obesity? ” These questions are based on a few theories and real data that explain Obesity as a biological adaptation and also the final results of weight loss programs.Many people attempt to lose weight by diet therapy, physical activity and lifestyle modifications. Importantly, weight loss strategies in the long term are ineffective and may have unintended consequences including decreasing energy expenditure, complicated appetite control, eating disorders, reducing self-esteem, increasing the plasma and tissue levels of persistent organic pollutants that promote metabolic complications, and consequently higher risk of repeated cycles of weight loss and weight regain.In this review, major paradoxes and controversies on Obesity including classic Obesity paradox; pre-Obesity; fat but fit theory; and healthy Obesity are explained. In addition, the relevant strategies like “Health at Every Size” that emphasize on promotion of global health behaviors rather than weight loss programs are explained.

Background: According to World Health Organization (WHO), overweight and Obesity are abnormal accumulation of body fat. Obesity was determined with different parameters such as BMI and waist circumference. Overweight and Obesity increase risk of liver, kidney and gallbladder diseases and different cancer such as thyroid, breast, colon, endometrium and prostate. In Iran about half of adults 15 to 65 years are overweight or obese (BMI>25) (42.9% of men and 56.9 % women). Various methods can be used to treat Obesity, including diet therapy, exercise, behavior therapy, pharmacotherapy and surgical methods.Nowadays the non-invasive devices are used for body contouring. Types of Devices Various devices are made with six different techniques: Suction-Massage Device (Endermologie), Suction-Massage and Thermal Devices (Triactive, Smoothshapes), Radiofrequency Energy Devices (Velasmooth, Thermage, Accent, Titefex), High-Frequency Focused Ultrasound Energy Devices (Ultrashape, Liposonix), Cryolipolysis Energy Device (Zeltiq), Low-Level Light Laser Therapy Device (Zerona). These devices are non-invasive technologies that reduce weight and body contouring that lead to kill fat cells and fat excretion through the lymph, improving cellulite and forming the body. treatment period includes several weeks to several months and is most effective when combined with a proper diet and appropriate physical activity. Few side effects have been reported regarding the use of them. Most of them (except Titefex and Ultrashape) are FDA approved.Methods: We systematically searched electronic databases including PubMed, ISI, Science Direct, EMBASE, Web of Science and SCOPUS from 1987 to 2013.Conclusion: These devices are not effective alone and should be associated with physical activity and diet. Body contouring devices use for local fats and BMI