© 1993 by Oxford University Press
Journal of the National Cancer Institute, Vol. 85, No. 11, 884-891,
June 2, 1993
© 1993 Oxford University Press
Diet and Risk of Colorectal Adenomas: Macronutrients, Cholesterol, and Fiber
Division of Digestive Diseases and Nutrition, Department of Medicine, and the Center for Gastrointestinal Biology and Disease Chapel Hill
Department of Biostatistics Chapel Hill
Department of Epidemiology Chapel Hill
Division of Digestive Diseases and Nutrition, Department of Medicine Chapel Hill
Department of Pathology, University of North Carolina Chapel Hill
Correspondence to: Rober S. Sandler, M.D., Division of Digestive Diseases and Nutrition, CB #7080, 423A Burnett-Womack Bldg., University of North Carolina, Chapel Hill, NC 27599-7080.
Background: Diet is thought to be important in the etiology of colorectal cancer. Studies suggest that a diet high in red meat and saturated fat and low in dietary fiber and vegetables may increase cancer risk. Diet may also be important in the development of colorectal adenomas that are precursors of most colorectal cancers, but this hypothesis has not been well studied. Purpose: This case—control study was designed to examine the effects of dietary consumption of cholesterol, fiber (vegetables, fruits, beans, and grains), and macronutrients (protein, carbohydrate, and fat) on risk for colorectal adenomas. Methods: Analyses were based on data from 236 subjects (105 men and 131 women) with histologically confirmed adenomas (cases) and 409 adenoma-free control subjects (165 men and 244 women), all of whom had had colonoscopy. Case and control subjects were similar with respect to gender, body mass, race, marital status, education, and indications for colonoscopy. Using a validated quantitative food-frequency questionnaire, an experienced graduate nutritionist interviewed each subject by telephone. Sex-specific analyses were conducted because the ranges of nutrient intake were substantially different for men and women. Odds ratios (ORs) were calculated according to quintiles of nutrient intake. Results: Carbohydrate intake was inversely related to adenoma risk in women (P for trend = .002). Compared with women in the lowest quintile of carbohydrate consumption, those in the highest quintile were 60% less likely to develop adenomas (OR = 0.39; 95% confidence interval [CI] = 0.19–0.80). Intake of fruit (P for trend = .028) and intake of fiber derived from vegetables and fruits (P for trend = .012) were also inversely related to adenomas in women. Total fat showed a positive association in women (P for trend = .004), with an OR of 2.69 for the highest versus the lowest quintile (95% CI = 1.31–5.50). Results were comparable for saturated fat (P for trend = .027). The risks in men were generally similar in direction and magnitude but were not statistically significant. Conclusions: These data support the hypothesis that a diet high in fat and low in carbohydrates, fruits, and fruit and vegetable fiber increases risk not only for colorectal cancer but also for precursor colorectal adenomas.
Implications: These results, which are consistent with findings of other investigators, suggest that environmental factors influencing risk for colorectal cancer, such as a high-risk diet, may lead to development of the precursor adenomas. (J Natl Cancer Inst 85:884–891, 1993]
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