Thank you very much for this interesting and important question.Try to lose weight before a surgical procedure its a very delicate matter, since in many cases a restrictive diet can cause problems, such as anemia, electrolyte disturbances, decreased protein, etc ... retarding the healing process and damaging the surgery.For these reasons, if your purpose is to lose weight, i recommend you have a BMI less than or equal to 30.In this regard, you must to have a support with a nutritionist, so you can achieve the desired goal, in the most healthy way, without incressing complications risks in the plastic surgery to perform.On the other hand, I recommend you yo be treated by a board certified plastic surgeon, with special training in Plastic Surgery After Massive Weight Loss. Therefore, it will use different surgical techniques and special safety measures for ex- obese patients.It's very important to make a preparation weeks or even months before the surgery, advising the patient to take certain measures that helps to have a successful surgery with very good results.Respectfully,Dr. Emmanuel Mallol.-