Research
Mixed
Large-scale prospective cohort studies with repeated dietary assessments and biospecimen collection provide high-validity evidence for associations between lifestyle factors (diet, physical activity, obesity) and cancer incidence/mortality, superior to early cohorts limited by single-time exposure assessment.
To accurately study how diet and lifestyle affect long-term health outcomes like cancer, researchers need large groups of people tracked over many years with updated information, rather than just a one-time survey.
StrongSupportsHIGH confidence
More recently, large cohort studies have collected questionnaire information and biospecimens to assess a comprehensive array of lifestyle, medical, and other risk factors as potential determinants of a wide range of specific diseases.
Why this rating
The paper describes a rigorously designed prospective cohort with high response rates and verified outcomes.
Source
The American Cancer Society Cancer Prevention Study II Nutrition Cohort
Eugenia E. Calle et al. · Cancer · 2002
DOI 10.1002/cncr.10197
cohort · n=184194Cited 481×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →