Diet and Prostate Cancer: The Role of IGF
Author Information
Author(s): Gunnell D, Oliver S E, Peters T J, Donovan J L, Persad R, Maynard M, Gillatt D, Pearce A, Hamdy F C, Neal D E, Holly J M P
Primary Institution: University of Bristol
Hypothesis
Are diet–prostate cancer associations mediated by the IGF axis?
Conclusion
The study found that higher dairy and calcium intake were associated with raised IGF-I levels, while higher vegetable and tomato consumption were linked to lower IGF-I levels.
Supporting Evidence
- Higher dairy and calcium intake were associated with raised IGF-I levels.
- Vegetable and tomato consumption were linked to lower IGF-I levels.
- Associations were not confounded by socioeconomic position or lifestyle.
Takeaway
Eating more dairy and calcium might increase a hormone linked to prostate cancer, while eating more vegetables and tomatoes could lower it.
Methodology
The study analyzed blood samples and dietary intake from 368 disease-free men using a food-frequency questionnaire.
Potential Biases
Potential confounding factors such as socioeconomic status and lifestyle were controlled for, but residual confounding may still exist.
Limitations
The cross-sectional design limits the ability to determine causality between diet and IGF levels.
Participant Demographics
Healthy middle-aged men, mean age 62.2 years, mostly nonsmokers from nonmanual social classes.
Statistical Information
P-Value
0.017 for polyunsaturated fat, 0.035 for calcium
Confidence Interval
95% CI for dietary variables not specified
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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