2. To compare EMF with oral PSMF clinically ( appetite control, polmonary function tests and metabolic pattern) and on metabolic parameters (hypertension, glucose intolerance, dyslipidaemia) maintaining body composition (particularly fat free mass and muscular strength) in 15 patients with disease-causing obesity not responding to medical treatment and/or cognitive/behavioural therapy, who are candidates for invasive treatment such as the gastric balloon or surgery but do not intend to undergo them compared with 15 undergoing the same regimen without the naso-gastric tube. To verify the effects of treatment with regard to the enteral-hormonal structure during the acute phase (selected sub-group) and while undergoing treatment.