Health outcomes and their association with weight regain after substantial weight loss in Sweden: a prospective cohort study

IF 13.6 Q1 HEALTH CARE SCIENCES & SERVICES Lancet Regional Health-Europe Pub Date : 2025-03-13 DOI:10.1016/j.lanepe.2025.101261
Lena M.S. Carlsson , Ida Arnetorp , Johanna C. Andersson-Assarsson , Peter Jacobson , Per-Arne Svensson , Magdalena Taube , Sofie Ahlin , Felipe M. Kristensson , Kristjan Karason , Ingrid Larsson , Cecilia Karlsson , Kirsi H. Pietiläinen , Ingmar Näslund , Björn Carlsson , Markku Peltonen , Kajsa Sjöholm
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Abstract

Background

The clinical implications of weight regain following weight loss remain uncertain. We analysed mortality, cardiovascular events, cancer, and microvascular disease in individuals with significant weight loss, comparing maintainers to regainers.

Methods

Using a prospective cohort design, we analysed 1346 participants who underwent bariatric surgery in the Swedish Obese Subjects (SOS) study, aged 37–60 years with BMI ≥34 (men) or ≥38 (women), recruited 1987–2001. Individuals who regained ≥20% of their 1-year weight loss after 4 years (regain group) were compared to those who regained less (maintenance group). The study was closed on December 31, 2020 with median follow-up of 27 years and 99.9% mortality tracking (ClinicalTrials.gov NCT01479452).

Findings

Average weight loss after 1 year was 29.3 ± 11.7 kg and 31.9 ± 13.8 kg and average weight change from year 1 to year 4 was +12.7 ± 6.6 kg and −0.6 ± 7.3 kg in the regain and maintenance groups, respectively. During follow-up, regain and maintenance groups showed similar rates of total mortality and cancer, 12.4 (95% CI: 10.9–14.2) vs 12.4 (10.7–14.3), p = 0.740, and 11.3 (95% CI: 9.7–13.0) vs 10.4 (8.8–12.2) per 1000 person-years (p = 0.308), respectively. The regain group had, however, higher incidence of microvascular disease, 11.0 (95% CI: 9.5–12.8) vs 8.7 (7.3–10.4) per 1000 person-years (p = 0.024), and while not statistically significant, also higher incidence of major adverse cardiovascular events (myocardial infarction, stroke, and heart failure) 15.7 (95% CI: 13.8–17.8) vs 13.0 (11.2–15.1) per 1000 person-years (p = 0.055).

Interpretation

Weight regain was linked to increased vascular disease risk but we could not demonstrate an association with life expectancy.

Funding

The Swedish Research Council, the Swedish State under the agreement between the Swedish Government and the county councils, the Health & Medical Care Committee of the Region Västra Götaland, the Adlerbert Research Foundation, the Wilhelm and Martina Lundgren Foundation, the Royal Society of Arts and Sciences in Gothenburg, Academy of Finland, Finnish Medical Foundation, Gyllenberg Foundation, Novo Nordisk Foundation, Finnish Diabetes Research Foundation, Paulo Foundation and Sigrid Juselius Foundation.
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来源期刊
CiteScore
19.90
自引率
1.40%
发文量
260
审稿时长
9 weeks
期刊介绍: The Lancet Regional Health – Europe, a gold open access journal, is part of The Lancet's global effort to promote healthcare quality and accessibility worldwide. It focuses on advancing clinical practice and health policy in the European region to enhance health outcomes. The journal publishes high-quality original research advocating changes in clinical practice and health policy. It also includes reviews, commentaries, and opinion pieces on regional health topics, such as infection and disease prevention, healthy aging, and reducing health disparities.
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