Weight loss

Suggested

4 studies · 1 recommendation

Last updated: February 25, 2026

Suggested4 studies

Achieving and maintaining a healthy weight reduces mortality and cardiovascular risk significantly

Four studies covering over 4.3 million participants demonstrate that obesity (BMI ≥30) substantially increases mortality and cardiovascular risk, while weight reduction yields measurable benefits. A Swiss cohort of 9,853 adults found obesity increased all-cause mortality by 41% (HR 1.41, 95% CI: 1.23–1.62) and cardiovascular mortality by 105% (HR 2.05, 95% CI: 1.60–2.62). A UK population-based study of 3.6 million adults showed obese individuals live 3.5–4.2 fewer years from age 40 compared to healthy-weight peers. Pooled analysis of 654,827 participants revealed that combining normal weight with physical activity adds up to 7.2 years of life compared to inactive obese individuals. A systematic review of 23 RCTs (13,733 patients, mean BMI 33.9) confirmed that non-surgical weight loss interventions—dietary changes, physical activity, and behavioral therapy—improve blood pressure, lipid profiles, and glucose tolerance regardless of the absolute weight lost.

Evidence

Obesity but not overweight is associated with increased mortality risk

Authors: Bopp, Matthias, Braun, Julia, Faeh, David, Tarnutzer, Silvan

Published: June 18, 2018

In a prospective cohort of 9,853 Swiss adults aged 25-74 followed for up to 25 years, obesity (BMI≥30) was associated with all-cause mortality HR 1.41 (95% CI: 1.23-1.62), cardiovascular disease mortality HR 2.05 (95% CI: 1.60-2.62), and cancer mortality HR 1.29 (95% CI: 1.04-1.60) compared to normal weight (BMI 18.5-24.9). Overweight (BMI 25-29.9) showed no statistically significant increase in mortality. Between 4% and 6.5% of all deaths, 8.8-13.7% of CVD deaths, and 2.4-3.9% of cancer deaths were attributable to obesity. Associations remained significant after adjustment for diet, physical activity, smoking, and educational class.

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Long-term effects of non-surgical therapy for obesity on cardiovascular risk management: a weighted empirical review

Authors: Laederach-Hofmann, Kurt, Messerli-Burgy, Nadine, Meyer, Katharina

Published: June 18, 2018

A systematic review of 23 randomized controlled trials encompassing 13,733 patients with a mean BMI of 33.9 kg/m² evaluated cardiovascular outcomes over a mean follow-up of 37 months (minimum 18 months). The review included studies of dietary interventions, physical activity programmes, behavioural therapy, and pharmacological treatments published between 1990 and 2007. Regardless of the absolute amount of weight loss achieved, positive effects on cardiovascular risk factors including blood pressure, lipids, and glucose tolerance were observed. The mean dropout rate across studies was 16.1%. Studies excluded patients with existing coronary heart disease, cancer, or medically treated diabetes and hypertension, strengthening the case for primary prevention benefits.

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Association of BMI with overall and cause-specific mortality: a population-based cohort study of 3·6 million adults in the UK.

Authors: Bhaskaran, Krishnan, Dos-Santos-Silva, Isabel, Douglas, Ian J, Leon, David A, Smeeth, Liam

Published: January 1, 2018

In a population-based cohort of 3,632,674 UK adults, among 1,969,648 never-smokers with 188,057 deaths, BMI showed a J-shaped association with all-cause mortality. Above 25 kg/m², the hazard ratio per 5 kg/m² increase was 1.21 (95% CI 1.20-1.22). Below 25 kg/m², the HR per 5 kg/m² increase was 0.81 (95% CI 0.80-0.82), indicating reduced mortality as BMI approached 25. Compared with healthy weight (BMI 18.5-24.9), life expectancy from age 40 was 4.2 years shorter in obese men (BMI ≥30) and 3.5 years shorter in obese women. Underweight individuals (BMI <18.5) also had shortened life expectancy: 4.3 years in men and 4.5 years in women.

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Leisure Time Physical Activity of Moderate to Vigorous Intensity and Mortality: A Large Pooled Cohort Analysis

Authors: A Koster, AJ Schuit, Alpa V. Patel, Amy Berrington de Gonzalez, BE Ainsworth, CD Lee, CE Matthews, CE Matthews, CE Matthews, Charles E. Matthews, CP Wen, D Spiegelman, EE Calle, Elisabete Weiderpass, GA Berrington de, GE Fraser, Hormuzd A. Katki, I-Min Lee, IM Lee, IM Lee, JM Genkinger, JP Higgins, Kala Visvanathan, Kathy J. Helzlsouer, Kay-Tee Khaw, KL Margolis, L Byberg, M Fogelholm, M Shields, Martha S. Linet, Michael Thun, NR Cook, OH Franco, P Ferrari, Patricia Hartge, PM Ridker, PT Katzmarzyk, Q Sun, R DerSimonian, R Doll, RA Howard, RC Brownson, RS Paffenbarger Jr, RW Makuch, S Durrleman, S Mahabir, SJ Olshansky, Steven C. Moore, Susan M. Gapstur, WA Ghali, Yikyung Park

Published: January 1, 2012

In joint analyses from 654,827 participants across six prospective cohorts with 82,465 deaths over median 10-year follow-up, being active (7.5+ MET-h/wk) and normal weight (BMI 18.5–24.9) was associated with a gain of 7.2 years of life (95% CI: 6.5–7.9) compared to being inactive (0 MET-h/wk) and obese (BMI 35.0+). Substantial life expectancy gains from physical activity were observed in each BMI group, but the largest absolute gains occurred when normal weight was combined with regular moderate-to-vigorous leisure time physical activity. Life expectancies were calculated using direct adjusted survival curves for participants aged 40 years and older.

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