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Background: The importance of dietary intake in the prevention of major health problems is acknowledged. Because of the impact of culture on food intake, this study investigated the relationship between place of birth and nutrient intake in Ontario, using data from the 1990 Ontario Health Survey., Methods: Adults (age = 18) were categorized as non-immigrants (born in Canada; n = 29,458) or immigrants (born outside of Canada, classified by countries of birth; n = 7,158). Energy, fat, cholesterol, carbohydrate, and fiber intakes were examined, as well as alcohol consumption during the previous week. A companion article describes results for protein and selected micronutrients. Multiple linear and logistic regression analyses investigated the association of place of birth with nutrient intakes, adjusting for sociodemographic factors and ethnicity., Results: Fat and carbohydrate intakes were strongly associated with place of birth, but cholesterol and fiber intakes were not. Immigrants, overall, were less likely than nonimmigrants to consume more fat (OR = 0.45, P < 0.0001), less carbohydrate (OR = 0.55, P < 0.0001), or more alcohol (OR = 0.64, P = 0.0004) than recommended. However, variations existed by country of birth., Conclusions: Immigrants were generally more likely to meet recommendation for fat and carbohydrate intakes than were nonimmigrants. These healthy eating behaviors need to be reinforced as part of health promotion.

After polypectomy for adenomatous colorectal polyps, 201 persons were randomized to receive counselling on a diet low in fat (the lesser of 50 g/day or 20% of energy) and high in fibre (50 g/day) (LFHF), or to follow a normal western diet (ND), high in fat and low in fibre. After 12 months of counselling, fat consumption was about 25% of energy in the LFHF group and 33% in the ND group; fibre consumption was 35 g and 16 g respectively. After an average of two years of follow-up, an intention to treat analysis led to a ratio of cumulative incidence rates of 1.2 (95% CL 0.6-2.2) for recurrence of neoplastic polyps, a finding which suggests no significant difference between dietary groups over the period of observation. An exploratory analysis conducted among 142 persons with substantial diet counselling indicated a reduced risk of neoplastic polyp recurrence in women (RR = 0.5), associated with reduced concentrations of faecal bile acids while on the LFHF diet, but indicated an increased risk of recurrence in men (RR = 2.1), associated with increased faecal bile acids. Although a larger study would be needed to rule out the role of chance, these findings of gender-specific associations between diet counselling and both faecal bile acid concentrations and recurrence of colorectal neoplasia are consistent with recently published evidence of differences between genders.

Per capita availability of crude and dietary fiber was estimated from 1972-74 FAO Food Disappearance Tables and factors derived from data on the fiber composition of foods. Total dietary and crude fiber, as well as dietary fiber from total cereals, wheat, rice, maize, other cereals, roots and tubers, pulses, vegetables, and fruits, was calculated for 38 countries. Total dietary fiber correlated highly with total crude fiber (r = 0.92). Cereals were the major source of fiber for most countries. With a few exceptions the estimated total dietary fiber and dietary fiber from cereals appear to be in reasonable agreement with other values obtained by a variety of methods for a number of developed countries. The reasons for some of the discrepancies found and the need for additional, more precise information on dietary fiber intake are discussed.

Dietary fiber is one of several variables being considered in the study of the relationship between diet and cancer. Intervention trials in which dietary fiber is increased are the most direct way of assessing the possible role of fiber in this disease. Two dietary snack products have been developed for use in a fiber intervention study: the high-fiber snack (HFS), which supplies 23 g of dietary fiber per day (mostly from wheat bran) and the low-fiber product (LFS), which provides 3.5 g. Over a 12-week period, 28 volunteers consumed the HFS for 6 weeks and the LFS for 6 weeks. Compliance, as assessed by reports, through recovery of a riboflavin marker in the urine and fecal fiber analysis, was good. The only adverse effects reported were mild abdominal discomfort and gas. Serum ferritin and calcium decreased in some subjects, indicating a need to supplement the products with these essential minerals. Consumption of the snacks did not affect total energy intake or the intake of the nutrients monitored.