Central Nervous Processing of Visual Food Stimuli in Severely Obese Subjects

Cantonal Hospital of St. Gallen

Status: Completed

Conditions: Obesity

Study type: Observational

Funder types: Other

Identifiers

NCT01493583

EKSG09/033/2B

09/033/2B (Other Identifier)

Details and patient eligibility

About

Recent evidence has pointed to distinct alterations of brain functions in obese subjects some of which may even be causative for their obesity. The objective of this study was to examine food and non food related alterations in brain functions after excessive weight loss due to Roux-en Y gastric bypass surgery (RYGB), one of the most successful therapeutic approaches for long lasting weight loss. The investigators hypothesized that obese as compared with lean women show an altered activation pattern in the brain areas involved in the homeostatic regulation of eating behavior, i.e. the hypothalamus, in reward-related brain areas, such as the orbital frontal cortex (OFC) and the striatum as well as in prefrontal inhibitory control areas. Furthermore, the investigators hypothesized that women who had undergone a RYGB operation show a brain activity pattern that more closely mimics that of lean than severely obese women. In a supplementary test the investigators will assess gastrointestinal and metabolic response to a standardized meal in order to elucidate putative correlation of these responses with the results of fMRI scannings.

Enrollment: 38 patients

Sex: Female

Ages: 18 to 70 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• women with BMI > 35kg/m2
• women, who had undergone gastric bypass surgery at least one year ago
• lean women

Exclusion criteria

• known psychiatric or neurological diseases
• current medication with drug acting on the central nervous system
• drugs that are known to affect eating behavior
• contraindication for the fMRI scanning, e.g. metal implants or metal containing tattoos

Trial design

38 participants in 3 patient groups

severely obese women

Women after Roux-en Y gastric bypass surgery

Description:

Women recruited for this group had undergone Roux-en Y gastric bypass surgery at least one year before. In this women measurement of brain activity and gastrointestinal and metabolic response took place between 13 and 106 month after surgery.

lean women