A medical device for treatment for overweight or obesity is presented. The medical device is attached or implanted in patient's target body organs, wherein in each one of the device attachments, or daily in the case of long continuous attachment, the device removes up to 100 grams of energy containing materials from the body. The medical device optionally contains needles or alternatively contains crawling worm-like arm. The energy containing materials may be fat cells, fatty acid molecules driven out from the fat cells or lipids or carbohydrates molecules such as glucose from the blood stream.
