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Does intentional weight loss reduce cancer risk?
Diabetes, Obesity & Metabolism
|July 8, 2011
Summary
Intentional weight loss may reduce cancer risk. Studies show reduced cancer incidence and key biomarkers like oestrogen and C-reactive protein (CRP) following weight loss, suggesting a prompt protective effect.
Area of Science:
- Oncology
- Metabolic Health
- Epidemiology
Background:
- Obesity is a significant risk factor for numerous cancers, including breast, endometrial, colorectal, kidney, esophageal, and pancreatic cancers.
- The potential for intentional weight loss to mitigate this elevated cancer risk remains under investigation.
Purpose of the Study:
- To investigate the impact of intentional weight loss on cancer incidence.
- To examine changes in cancer-relevant biomarkers following intentional weight loss, including hormones and inflammatory markers.
Main Methods:
- Systematic literature search for observational cohort studies and randomized controlled trials (RCTs) involving dietary interventions and bariatric surgery.
- Analysis of studies reporting cancer risk changes and alterations in biomarkers such as oestrogens, sex hormone binding globulin (SHBG), Insulin-like growth factor-I (IGF-I), and inflammatory markers (CRP, IL-6, TNF-α).
Main Results:
- Observational and RCT data indicate a prompt decrease in cancer incidence following intentional weight loss.
- Significant reductions in oestrogen levels and increases in SHBG were observed, with a 10% weight loss potentially reducing free estradiol by one-third.
- Substantial decreases in C-reactive protein (CRP) levels were noted, alongside smaller reductions in TNF-α and IL-6. Changes in IGF-I and IGF binding proteins were inconsistent.
Conclusions:
- Intentional weight loss appears to lead to relatively rapid reductions in cancer incidence.
- The observed decreases in cancer biomarkers suggest that intentional weight loss may offer a meaningful and timely reduction in cancer risk.
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