The Bialystok Bariatric Surgery Study (BBSS) is a prospective observational cohort study of patients undergoing bariatric surgery at the First Clinical Department of General and Endocrine Surgery at the Medical University of Bialystok. The BBSS consists of a battery of baseline tests established one month prior to the surgery and repeated at one, three, six, twelve and twenty four-month follow-up clinical visits.
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Weight loss
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Lean body mass
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Fat mass
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Visceral adipose tissue mass
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Fasting glucose
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Triglycerides (TG)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
High-density lipoprotein cholesterol (HDL)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Low-density lipoprotein cholesterol (LDL)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Total cholesterol
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Fasting insulin
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
2-hour glucose
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Haemoglobin A1c (HbA1c)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Homeostatic model assessment for insulin resistance (HOMA-IR)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Homeostatic model assessment of beta cell function (HOMA-beta)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Changes in glucose and insulin concentrations during the oral glucose tolerance test (OGTT)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Changes in glucose and insulin concentrations during the mixed meal tolerance test (MMTT)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Changes in GI hormones concentrations during the oral glucose tolerance test (OGTT)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery
Changes in GI hormones concentrations during the mixed meal tolerance test (MMTT)
Timeframe: 1, 3, 6, 12 and 24 months after the surgery