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Bariatric Surgery Outcomes in an Italian Single-Center Study: Does Chronotype Matter?
Federica Sileo1,2, Santo Colosimo1, Amalia Bruno3
1Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Milan, Italy.
Obesity Surgery
|January 14, 2026
Summary
Chronotype, an individual's daily timing preference, did not significantly impact weight loss outcomes 6 and 12 months after bariatric surgery in severely obese patients. Further research is needed to confirm these findings.
Area of Science:
- Chronobiology
- Obesity Medicine
- Bariatric Surgery Outcomes
Background:
- Chronotype, or circadian preference for daily activities, influences lifestyle and metabolic health.
- Bariatric surgery outcomes are multifactorial, with potential impacts on weight loss and regain.
- Understanding chronotype's role in obesity management is increasingly important.
Purpose of the Study:
- To investigate the association between chronotype and weight loss after bariatric surgery.
- To evaluate chronotype's impact on key weight loss metrics at 6 and 12 months post-surgery.
Main Methods:
- A cohort of 263 bariatric surgery patients was assessed.
- Baseline evaluations included anthropometrics, biochemistry, and chronotype categorization.
- Postoperative outcomes measured included absolute weight, BMI, percentage of initial body weight loss (%IBWL), and percentage of excess body weight loss (%EBWL) at 6 and 12 months.
Main Results:
- No significant differences in weight loss outcomes were observed among morning, intermediate, and evening chronotypes.
- Absolute weight, BMI, %EBWL, and %IBWL showed no significant variation based on chronotype at 6 and 12 months.
Conclusions:
- Chronotype does not appear to be a critical factor influencing weight loss in severely obese patients undergoing bariatric surgery.
- Further research with detailed chronotype characterization is necessary to fully elucidate its role in bariatric surgery outcomes.
