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Biomedical subjects

P Pietinen

Publications and source records attributed to P Pietinen.

At least 19 recordsLinked to original sources

Intake of fatty acids and risk of coronary heart disease in a cohort of Finnish men. The Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study.

The relation of intakes of specific fatty acids and the risk of coronary heart disease was examined in a cohort of 21,930 smoking men aged 50-69 years who were initially free of diagnosed cardiovascular disease. All men participated in the Finnish Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study and completed a detailed and validated dietary questionnaire at baseline. After 6.1 years of follow-up from 1985-1988, the authors documented 1,399 major coronary events and 635 coronary deaths. After controlling for age, supplement group, several coronary risk factors, total energy, and fiber intake, the authors observed a significant positive association between the intake of trans-fatty acids and the risk of coronary death. For men in the top quintile of trans-fatty acid intake (median = 6.2 g/day), the multivariate relative risk of coronary death was 1.39 (95% confidence interval (CI) 1.09-1.78) (p for trend = 0.004) as compared with men in the lowest quintile of intake (median = 1.3 g/day). The intake of omega-3 fatty acids from fish was also directly related to the risk of coronary death in the multivariate model adjusting also for trans-saturated and cis-monounsaturated fatty acids (relative risk (RR) = 1.30, 95% CI 1.01-1.67) (p for trend = 0.06 for men in the highest quintile of intake compared with the lowest). There was no association between intakes of saturated or cis-monounsaturated fatty acids, linoleic or linolenic acid, or dietary cholesterol and the risk of coronary deaths. All the associations were similar but somewhat weaker for all major coronary events.

Aged

Serum levels of vitamin D metabolites and the subsequent risk of colon and rectal cancer in Finnish men.

Experimental and human epidemiologic data suggest a protective role for vitamin D in large bowel cancer. To investigate this association, we conducted a nested case-control study within a Finnish clinical trial cohort. Cases (n = 146) were participants diagnosed with primary adenocarcinoma of the large bowel. Controls were matched (2:1) to cases on age, date of baseline blood draw, and study clinic. Prediagnostic serum levels of the vitamin D metabolites, 25-hydroxyvitamin D (25-OH D), and 1,25-dihydroxyvitamin D (1,25-DIOH D) were used as primary exposure measures. The baseline geometric-mean serum level of 25-OH D was 11.6 percent lower in cases than in controls (12.2 cf 13.8 ug/l, P = 0.01) while serum levels of 1,25-DIOH D did not differ by case-control status. No association was seen between serum levels of 1,25-DIOH D and large bowel cancer risk. However, the estimated relative risk (RR) of large bowel cancer decreased with increasing level of serum 25-OH D and the association was more pronounced for rectal cancer (55 cases; RR by quartile = 1.00, 0.93, 0.77, 0.37; trend P = 0.06). Neither exclusion of early cases nor multivariate adjustment for potential confounders materially altered these estimates. There was no evidence of effect modification by level of 1,25-dihydroxyvitamin D or with other known risk-factors for large bowel cancer.

Adenocarcinoma

Increasing prevalence of underreporting does not necessarily distort dietary surveys.

OBJECTIVES: To study the magnitude of and trends in energy underreporting and to compare food consumption, nutrient intake and socioeconomic characteristics of underreporters to those of other Finnish adults. DESIGN: Cardiovascular risk factor surveys in 1982 and 1992 using a 3 d food record. Underreporting was defined as energy intake lower than 1.27* BMR, since energy intake < 1.27* BMR is improbable. SETTING: Four areas in Finland, both rural and urban. SUBJECTS: 1746 men and 1921 women, aged, 25-64 y. RESULTS: Proportion of underreporters has increased from 33% in 1982 to 46% in 1992 among women and from 27% in 1982 to 42% in 1992 among men. In a logistic regression model, BMI over 25 kg/m2, female gender, age over 45 y and high educational level predicted underreporting. Shares of energy intake from fat, carbohydrates, protein and alcohol remained the same whether or not underreporters were excluded. However, underreporters consumed significantly higher proportion of vegetables, fish, meat, potatoes, fruit and berries and less fat than others. In the 1992 data the absolute intake of most micronutrients increased and micronutrient densities decreased when underreporters were excluded. CONCLUSIONS: The proportion of underreporters has grown from 1982 to 1992. Results expressed as a percentage of energy intake are not affected by the exclusion of underreporters. In contrast, micronutrient intakes, both absolute and energy density values, were distorted by underreporting. Underreporting should be taken into account in future studies.

Adult

Alcohol beverage drinking, diet and body mass index in a cross-sectional survey.

OBJECTIVE: The study was carried out to determine the associations of alcohol beverage drinking with macronutrients, antioxidants, and body mass index. SETTING: Dietary subsample of the 1992 Finmonica cardiovascular risk factor survey in Finland; a cross-sectional study. SUBJECTS: 985 women and 863 men were drawn from the population register in the four monitoring areas. All subjects were 25-64 y of age. METHODS: The mailed questionnaire included questions covering socioeconomic factors, physical activity, smoking, and alcohol consumption. The diet was assessed using a three-day food record. RESULTS: The dietary differences between abstainers and alcohol consumers were more significant than between consumers of different alcoholic beverages. Among drinkers, fat intake as a percentage of energy was higher and carbohydrate intake was lower than among abstainers. Those who preferred wine, however, had the highest vitamin C intake; female wine drinkers also had the highest carotenoid intake. With the exception of those who mainly preferred spirits, alcohol energy was not added to the diet but seemed to substitute food items both in men and women. Despite the similar total daily energy intakes, daily energy expenditure, and physical activity index, male drinkers were leaner than abstainers. In women, the proportion of underreporters of energy intake increased with increasing alcohol consumption, and the association between alcohol and body mass index was similar to that in men after the exclusion of underreporters. CONCLUSIONS: Alcohol consumers were leaner than abstainers, and wine drinkers in particular had more antioxidants in their diet.

Adult

Association between salt intake, heart rate and blood pressure.

The present study investigated the association between 24-h urinary sodium excretion and heart rate in the determination of blood pressure (BP) levels in a large random population sample from eastern Finland. Three independent risk factor surveys were performed in 1979, 1982 and 1987 using the same methodology. Data from each survey was pooled for subjects aged 25-64 years who reported a complete 24-h urine collection and were not on the current antihypertensive treatment (1640 men and 1686 women). The effect of urinary sodium excretion and heart rate was examined by regressing BP on urinary sodium excretion and pulse rate, together with age and body mass index (BMI). Analyses stratified by quintiles of heart rate were also performed. There was no association between urinary sodium and BP either in men or in women. There was a significant correlation between heart rate and both systolic and diastolic BP in both men and women. A significant interaction between age and BMI with heart rate was also found in both sexes. Interaction between urinary sodium and heart rate was found neither in men nor in women. Among men, after adjustment for age and BMI, there was a curvilinear relation between 24-h urinary excretion of sodium and diastolic BP (P = 0.054) in the lowest quintile of heart rate (<60 beats/min). No correlations were observed among women in any of the quintiles of heart rate.

Adult

Influence of apolipoprotein A-1 promoter polymorphism on lipid levels and responses to dietary change in Finnish adults.

OBJECTIVES: To analyse the association between the G/A polymorphism in the apolipoprotein A-1 (apo A-1) promoter region and plasma lipid levels, as well as their responses to dietary change, in Finnish adults. SUBJECTS AND DESIGN: Blood samples from 86 subjects (42 men. 44 women) who attended a dietary intervention study carried out in North Karelia in 1993 were available for the current analysis. The diet study consisted of a 2-week baseline period, followed by an 8-week intervention period, and an 8-week switchback period. INTERVENTION: Diet was modified to a low-fat, low-cholesterol diet during the dietary intervention. MAIN OUTCOME MEASURES: Fasting plasma lipid, lipoprotein and apoliprotein levels were determined. RESULTS: At baseline, the high-density lipoprotein (HDL) cholesterol and apo A-1 levels were higher (P < 0.01) and the triglyceride levels were lower (P < 0.05) in men, but not in women, with the A allele. The differences in HDL cholesterol and apo A-1 levels between genotypes remained during the lowfat, low-cholesterol diet and switchback periods. Apart from the difference between responses in apo A-1 during switchback to the original diet, lipid responses to dietary change did not differ significantly between genotypes. CONCLUSION: Our findings indicate a significant association between the apo A-1 promoter polymorphism and plasma apo A-1 and HDL-cholesterol in men. In theory, the higher plasma HDL-cholesterol and apo A-1 levels in the GA/AA group may confer some protection against coronary artery disease. The differences in HDL-cholesterol and apo A-1 levels between genotypes persisted during different diets suggesting that the possible benefit is independent of fat and cholesterol intake.

Adult

Effects of supplemental beta-carotene, cigarette smoking, and alcohol consumption on serum carotenoids in the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study.

We determined whether serum carotenoid or retinol concentrations were altered by beta-carotene supplementation in the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study and whether such effects were modified by alcohol consumption or cigarette use. Participants in this substudy were 491 randomly selected men aged 58-76 y from the metropolitan Helsinki study center [237 receiving supplemental beta-carotene (20 mg/d) and 254 not receiving such supplementation]. Dietary carotenoids, retinol, and alcohol, and serum beta-carotene, alpha-tocopherol, retinol, and cholesterol were assessed at baseline. After an average of 6.7 y of supplementation, serum was collected and carotenoid, retinol, and alpha-tocopherol concentrations were determined by HPLC. Serum carotenoid fractions were highly correlated with each other (P < or = 0.0001). Compared with the unsupplemented group, the beta-carotene group had significantly higher serum concentrations of beta-carotene (1483%), alpha-carotene (145%), and beta-cryptoxanthin (67%) (P < or = 0.0001). Retinol concentrations were 6% higher (P = 0.03) and lutein was 11% lower (P = 0.02) in the supplemented group. Serum lycopene, zeaxanthin, and alpha-tocopherol did not differ according to beta-carotene-supplementation status. Although these beta-carotene-group differences were not significantly altered by amount of alcohol consumption, higher consumption (> 12.9 g/d, median) was related to lower (10-38%) concentrations of carotenoids, particularly beta-carotene, alpha-carotene, and beta-cryptoxanthin, in both the supplemented and unsupplemented groups. Smoking status did not significantly influence the supplementation-related differences in serum carotenoid and retinol values but concentrations of carotenoids were generally highest in participants who quit smoking while in the study and lowest in current smokers of > or = 20 cigarettes/d. This study showed that serum concentrations of non-beta-carotene carotenoids are altered by long-term beta-carotene supplementation and confirms the adverse effects of alcohol and cigarette smoking on serum carotenoids.

Aged

Intake of dietary fiber and risk of coronary heart disease in a cohort of Finnish men. The Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study.

BACKGROUND: Even though dietary fiber has been hypothesized to reduce the risk of coronary heart disease, few large epidemiological studies have examined this relation with good methodology. METHODS AND RESULTS: The Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study was a randomized, double-blind, placebo-controlled trial with daily supplementation of alpha-tocopherol and/or beta-carotene. Of the participants, 21930 smoking men aged 50 to 69 years who were free of diagnosed cardiovascular disease and had completed a validated dietary questionnaire at baseline were followed for 6.1 years. We monitored the incidence of major coronary events (a combination of first nonfatal myocardial infarction and coronary heart disease death; n = 1399) and mortality from coronary heart disease (n = 635). Both entities had a significant inverse association with dietary fiber, but the association was stronger for coronary death. For men in the highest quintile of total dietary fiber intake (median, 34.8 g/d), the relative risk for coronary death was 0.69 (95% confidence interval, 0.54 to 0.88; P < .001 for trend) compared with men in the lowest quintile of intake (median, 16.1 g/d). With an adjustment for known cardiovascular risk factors, intake of saturated fatty acids, beta-carotene, vitamin C, and vitamin E did not materially change the result. Water-soluble fiber was slightly more strongly associated with reduced coronary death than water-insoluble fiber, and cereal fiber also had a stronger association than vegetable or fruit fiber. CONCLUSIONS: These findings suggest that independent of other risk factors, greater intake of foods rich in fiber can substantially reduce the risk of coronary heart disease, and particularly coronary death, in middle-aged, smoking men.

Aged

Alpha-Tocopherol and beta-carotene supplements and lung cancer incidence in the alpha-tocopherol, beta-carotene cancer prevention study: effects of base-line characteristics and study compliance.

BACKGROUND: Experimental and epidemiologic investigations suggest that alpha-tocopherol (the most prevalent chemical form of vitamin E found in vegetable oils, seeds, grains, nuts, and other foods) and beta-carotene (a plant pigment and major precursor of vitamin A found in many yellow, orange, and dark-green, leafy vegetables and some fruit) might reduce the risk of cancer, particularly lung cancer. The initial findings of the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study (ATBC Study) indicated, however, that lung cancer incidence was increased among participants who received beta-carotene as a supplement. Similar results were recently reported by the Beta-Carotene and Retinol Efficacy Trial (CARET), which tested a combination of beta-carotene and vitamin A. PURPOSE: We examined the effects of alpha-tocopherol and beta-carotene supplementation on the incidence of lung cancer across subgroups of participants in the ATBC Study defined by base-line characteristics (e.g., age, number of cigarettes smoked, dietary or serum vitamin status, and alcohol consumption), by study compliance, and in relation to clinical factors, such as disease stage and histologic type. Our primary purpose was to determine whether the pattern of intervention effects across subgroups could facilitate further interpretation of the main ATBC Study results and shed light on potential mechanisms of action and relevance to other populations. METHODS: A total of 29,133 men aged 50-69 years who smoked five or more cigarettes daily were randomly assigned to receive alpha-tocopherol (50 mg), beta-carotene (20 mg), alpha-tocopherol and beta-carotene, or a placebo daily for 5-8 years (median, 6.1 years). Data regarding smoking and other risk factors for lung cancer and dietary factors were obtained at study entry, along with measurements of serum levels of alpha-tocopherol and beta-carotene. Incident cases of lung cancer (n = 894) were identified through the Finnish Cancer Registry and death certificates. Each lung cancer diagnosis was independently confirmed, and histology or cytology was available for 94% of the cases. Intervention effects were evaluated by use of survival analysis and proportional hazards models. All P values were derived from two-sided statistical tests. RESULTS: No overall effect was observed for lung cancer from alpha-tocopherol supplementation (relative risk [RR] = 0.99; 95% confidence interval [CI] = 0.87-1.13; P = .86, logrank test). beta-Carotene supplementation was associated with increased lung cancer risk (RR = 1.16; 95% CI = 1.02-1.33; P = .02, logrank test). The beta-carotene effect appeared stronger, but not substantially different, in participants who smoked at least 20 cigarettes daily (RR = 1.25; 95% CI = 1.07-1.46) compared with those who smoked five to 19 cigarettes daily (RR = 0.97; 95% CI = 0.76-1.23) and in those with a higher alcohol intake (> or = 11 g of ethanol/day [just under one drink per day]; RR = 1.35; 95% CI = 1.01-1.81) compared with those with a lower intake (RR = 1.03; 95% CI = 0.85-1.24). CONCLUSIONS: Supplementation with alpha-tocopherol or beta-carotene does not prevent lung cancer in older men who smoke. beta-Carotene supplementation at pharmacologic levels may modestly increase lung cancer incidence in cigarette smokers, and this effect may be associated with heavier smoking and higher alcohol intake. IMPLICATIONS: While the most direct way to reduce lung cancer risk is not to smoke tobacco, smokers should avoid high-dose beta-carotene supplementation.

Age Factors

Body-size indicators and risk of breast cancer according to menopause and estrogen-receptor status.

Associations between the risk of breast cancer and body-size indicators at the time of breast-cancer diagnosis were assessed among 328 pre-menopausal or post-menopausal cases and 417 controls participating in the Kuopio Breast Cancer Study. This case-control study follows the protocol of the international Collaborative Study of Breast and Colorectal Cancer. When the potential confounding factors were taken into account, tallness was related to increased risk of breast cancer, especially in post-menopausal women, whereas no clear association with body-mass index (BMI) was found. Waist-to-hip ratio (WHR) was the most important risk factor in both pre-menopausal and post-menopausal women. The post-menopausal cases with high positive estrogen-receptor status (ER++) had the highest weight and BMI; they had also the biggest weight gain since the age of 20. However, the association between WHR and breast cancer appeared to be independent of estrogen-receptor status. Our results suggest that WHR may be a better marker for breast cancer than the degree of adiposity.

Adult

The effects of the apolipoprotein B signal peptide (ins/del) and XbaI polymorphisms on plasma lipid responses to dietary change.

There is interindividual variation in plasma lipid response to dietary changes. The polymorphisms which are associated with plasma lipid levels could possibly explain part of this variation. Therefore, the apolipoprotein B (apo B) signal peptide insertion/deletion (ins/del) and XbaI restriction fragment length polymorphisms are possible regulators of plasma lipid responses. We examined their role in the regulation of plasma lipid responses in 87 North Karelians (43 men, 44 women). The dietary study consisted of a 2-week baseline period (34-35% of energy from fat), followed by an 8-week low-fat (24 En%), low-cholesterol (279 mg/d) diet period and an 8-week switchback period. In this study population the apo B ins/del and XbaI polymorphisms exhibited mainly similar and partly significant effects on the responses of plasma very low-density lipoprotein (VLDL) and high density lipoprotein2 (HDL2) cholesterol to dietary changes. After consumption of the low saturated fat, low-cholesterol diet, ins/ins X - /X - homozygotes showed the greatest increase in VLDL cholesterol (p < 0.05 for differences between ins/del genotypes) and the greatest fall in HDL2 cholesterol (p = 0.01 for ins/del and p = 0.05 for XbaI), while only minimal alterations were seen in the del/del and X + /X + groups. After returning to the original diet, the changes of these lipids were reversed, ins/ins and X -/X - homozygotes having the greatest reductions in VLDL cholesterol (p < 0.05 for XbaI) and the greatest increases in HLDL2 cholesterol (p < 0.001 for XbaI). The findings suggest that plasma VLDL and HDL2 cholesterol responsiveness to diet may be partly explained by variation at the apo B gene.

Aged

Dietary sodium and potassium, socioeconomic status and blood pressure in a Chinese population.

The average total intake of sodium was 6.11 g in a Chinese urban diet and 6.49 g in the rural sample in China. Discretionary use of salt provided 53% of the total sodium intake in the urban and 63% in the rural diet. Sodium intakes derived from processed foods, soy sauce and monosodium glutamate were 17%, 16% and 6% respectively in the urban diet, and 4%, 16%, 2% respectively in the rural diet. The mean intake of potassium was 1.95 g in the urban and 1.83 g in the rural diet. Cereals and vegetables were the major sources of dietary potassium. The intakes of total sodium, salt and soy sauce decreased as educational level increased. Similar results were found in white-collar workers and blue-collar workers or farmers. Nevertheless, an inverse association between blood pressure and education was found. The results suggest that reduction in sodium intake, especially cooking salt, and increased potassium intake are needed for nutritional control of hypertension in population-based interventions aimed at all social classes.

Adult

Alcohol consumption and risk of colorectal cancer in a cohort of Finnish men.

We investigated the association between self-reported alcohol ingestion and colorectal cancer in a cohort of male smokers in Finland. Among 27,109 men aged 50 to 69 years, 87 colon and 53 rectal cases were diagnosed during the five to eight years of follow-up. Among drinkers, colorectal cancer risk increased with the amount of alcohol consumed (P trend = 0.01) with risk increasing by 17 percent for each drink consumed. Both beer and spirits contributed to this increased risk. Further analyses revealed that the positive association with alcohol was primarily for colon cancer (P trend = 0.01). Interestingly, risk of colorectal cancer associated with drinking (cf self-reported abstinence) changed with follow-up time, suggesting an inverse association for alcohol early in follow-up, and a positive association after about three-and-a-half years of follow-up. Follow-up time did not modify the positive association with amount of alcohol among drinkers, however. Results also indicated that beta-carotene supplementation may attenuate the effect of alcohol on colorectal cancer risk among drinkers. In conclusion, this study supports a role for alcohol in colon carcinogenesis and suggests that similar studies should evaluate carefully the effects of lifetime drinking habits and recent abstinence.

Aged

Vitamin E concentration in breast adipose tissue of breast cancer patients (Kuopio, Finland).

Previous data on animals and humans suggest that vitamin E may be a protective factor against cancer. A low dietary vitamin E intake has been suggested to increase the risk of breast cancer. We examined the dietary intake and the concentration of vitamin E in breast adipose tissue of women in Kuopio, Finland, diagnosed between 1990 and 1992 with benign breast disease (n = 34) and with breast cancer (n = 32). In postmenopausal women, lower dietary intake (P = 0.006) and a smaller concentration of vitamin E in breast adipose tissue (P = 0.024) were observed in breast cancer patients than in subjects with benign breast disease. Partial correlation showed that the vitamin E concentration in the breast adipose tissue correlated positively with the dietary intake of vitamin E (r = 0.25, P = 0.023), indicating that the vitamin E concentration in breast adipose tissue reflects the dietary intake of vitamin E.

Adipose Tissue

Reproducibility and validity of a food frequency questionnaire in a case-control study on breast cancer.

A 110-item food frequency questionnaire was tested among 152 community controls of the Kuopio Breast Cancer Study. They completed the questionnaire twice and kept two 7-day diet records at 3-month intervals. The intraclass correlations for nutrients varied from 0.49 (thiamine with supplements) to 0.81 (lactose), and for foods from 0.52 (poultry) to 0.84 (alcoholic drinks). The Pearson correlations between the first food frequency questionnaire and the 14-day diet records, after adjustment for energy, varied for nutrients from 0.18 (thiamine without supplements) to 0.80 (alcohol), and for foods from 0.30 (inner organs) to 0.90 (coffee). Comparison of quintile classification between the two methods is reasonably accurate when observed restrictions concerning some nutrients and foods are taken into account. A low association (r = 0.12) was observed between toenail selenium and dietary selenium intake, indicating the difficulty of estimating selenium intake in the Finnish diet.

Adult

Trends in body mass index and obesity among adults in Finland from 1972 to 1992.

OBJECTIVE: To investigate trends in body mass index (BMI) and prevalence of obesity in different areas and educational groups in Finland. DESIGN: Cardiovascular risk factor surveys carried out at five-year intervals among men and women aged 30 to 59 years from 1972 to 1992. MEASUREMENTS: Body mass index and educational level have been measured in each survey. RESULTS: BMI increased in men over 40 years of age until 1987 and then levelled off. BMI decreased in women in all age groups until 1982 and then levelled off. Even though all men have become heavier, the change has been smallest in the highest educated group. This difference is even more pronounced in women. The prevalence of obesity (BMI over 30 kg2) was 19% in men and 18% in women in 1992. The prevalence of overweight (BMI over 25 kg/m2) was 63% in men and 49% in women. The prevalence of obesity among men with the lowest educational level was 27% and in women 26%. CONCLUSION: The differences in BMI between educational groups have become wider in both genders during 1972-1992.

Adult

Reported alcohol intake, diet and body mass index in male smokers.

OBJECTIVE: The study was carried out to determine associations of reported alcohol intake with diet and body mass index. Type and frequency of consumed alcohol were also considered. DESIGN: A cross-sectional study. SETTING: The baseline examination of the participants of the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study in 1985-1988. SUBJECTS: 27215 middle-aged Finnish male smokers. INTERVENTIONS: The diet was assessed by a self-administered food use questionnaire: Subject's habitual diet and alcohol intake over the previous 12 months were asked. Body mass index was used as the measure of adiposity. RESULTS: Energy intake from food was not related to alcohol intake. Although alcohol consumption was associated with food selection (eg berry and coffee consumption), this only slightly influenced daily nutrient intakes. Intake of spirits was more consistently related to higher body mass index than that of other alcoholic beverages. Daily alcohol intake had a much smaller association with body mass index than less frequent use, independently of the total consumption. CONCLUSIONS: The differences in nutrient intake between abstainers, light and moderate alcohol consumers were small although the consumption of many foods varied with alcohol consumption. Even if alcohol consumption is one noteworthy factor associated with weight, the energy from alcohol increases body weight less than expected; both the type and frequency of consumed alcohol may explain why energy from alcohol is utilized less efficiently than non-alcoholic energy.

Aged