An intervention study design in 90 obese patients will be used. Nutritional, metabolic and
psychological status as well as gut microbiota will be evaluated before gastric bypass and 6
months post surgery. During this period of 6 months, all patients will receive a specific
diet according to recommendation with regard to bariatric surgery.
Subjects will be than randomized in 2 sub-groups:
A. patients receiving a standard healthy diet without micro-nutriments' supplementation; B.
patients receiving a healthy diet and probiotics, minerals, aminoacids, omega-3 acids vitamin
and mineral supplementation