Dietary Fiber Intake and Endogenous Serum Hormone Levels in Naturally Postmenopausal Mexican American Women: The Multiethnic Cohort Study

This study investigated dietary fiber intake in association with serum estrogen levels in naturally postmenopausal Latina women with a wide range of fiber intake. Estrone (E₁), estradiol (E₂), and sex-hormone-binding globulin (SHBG) were measured in 242 women. Associations between estrogen levels and intake of dietary fiber, including insoluble and soluble fractions, quantified from a food frequency questionnaire, were examined. The biomarker enterolactone was also measured. After adjustment for age, weight, and other nondietary factors, dietary fiber intake was inversely associated with E₁ and E₂; there was a 22% and 17% decrease (2P _trend = 0.023 and 0.045) among subjects in the highest quintile of intake compared with the lowest. Fitting dietary fiber together with soluble and insoluble nonstarch polysaccharides (NSP) showed a much greater decrease in E₁ and E₂ (47% and 41%, respectively) while increased soluble NSP intake showed increases in E₁ and E₂ (64% and 69%, respectively). Two foods, avocado and grapefruit, showed significant positive associations with E ₁ (2P _trend = 0.029 and 0.015, respectively). This study suggests that different components of dietary fiber may have very significant different effects on serum estrogen levels. The suggestive findings relating increased estrogen levels to avocado and grapefruit intakes need confirmation.     

The Effect of Grapefruit Intake on Endogenous Serum Estrogen Levels in Postmenopausal Women

Although grapefruit intake leads to elevated serum estrogen levels when hormones are taken orally, there are no published data on the effect on endogenous levels. We conducted a pilot dietary intervention study among healthy postmenopausal volunteers to test whole grapefruit, 2 juices, and 1 grapefruit soda. Fifty-nine participants were recruited through the Love/Avon Army of Women. The study consisted of a 3-wk run-in, 2 wk of grapefruit intake, and a 1-wk wash-out. Eight fasting blood samples were collected. An additional 5 samples drawn at 1, 2, 4, 8, and 10 hr after grapefruit intake were collected during an acute-phase study for 10 women. Serum assays for estrone (E₁), estradiol (E₂), estrone-3-sulfate (E₁S), dehydroepiandrosterone sulfate, and sex hormone-binding globulin were conducted. Whole grapefruit intake had significant effects on endogenous E₁S. Peak effects were seen at 8 hr, increasing by 26% from baseline. No changes in mean E₁ or E₂ with whole fruit intake were observed. In contrast, fresh juice, bottled juice, and soda intake all had significant lowering effects on E₂. The findings suggest an important interaction between grapefruit intake and endogenous estrogen levels. Because endogenous estrogen levels are associated with breast cancer risk, further research is warranted.     

Defatted avocado pulp reduces body weight and total hepatic fat but increases plasma cholesterol in male rats fed diets with cholesterol

The potential use of avocado as a fiber source was evaluated. The total dietary fiber content of fresh avocado fruit of the Ettinger variety was 5.2 g/100 g. Approximately 75% was insoluble, and 25% soluble. The water-holding capacity of dry defatted avocado pulp was similar to that of cellulose, and trypsin inhibitors were not detected. The dietary and metabolic consequences of the avocado pulp were studied in male rats fed normal and hypercholesterolemic diets. Rats consumed semipurified diets containing either avocado pulp as the dietary fiber source or cellulose (control) with or without 10 g/kg cholesterol and 5 g/kg cholic acid. Food consumption and body weight gain were lower in rats fed avocado compared with those fed cellulose. Relative cecum weight was higher in avocado-fed rats. Plasma and hepatic cholesterol levels did not differ in rats fed diets without cholesterol, but plasma cholesterol was greater in avocado-fed than in cellulose-fed rats that consumed cholesterol. Regardless of dietary cholesterol, hepatic total fat levels, as evaluated histologically, but not directly, were lower in avocado-fed rats. These data suggest the presence of an appetite depressant in avocado and that avocado pulp interferes with hepatic fat metabolism.     

Association between dietary fiber and markers of systemic inflammation in the Women's Health Initiative Observational Study

OBJECTIVE: Systemic inflammation may play an important role in the development of atherosclerosis, type 2 diabetes, and some cancers. Few studies have comprehensively assessed the direct relations between dietary fiber and inflammatory cytokines, especially in minority populations. Using baseline data from 1958 postmenopausal women enrolled in the Women's Health Initiative Observational Study, we examined cross-sectional associations between dietary fiber intake and markers of systemic inflammation (including serum high-sensitivity C-reactive protein [hs-CRP], interleukin-6 [IL-6], and tumor necrosis factor-alpha receptor-2 [TNF-alpha-R2]) in addition to differences in these associations by ethnicity. METHODS: Multiple linear regression models were used to assess the relation between fiber intake and makers of systemic inflammation. RESULTS: After adjustment for covariates, intakes of dietary fiber were inversely associated with IL-6 (P values for trend were 0.01 for total fiber, 0.004 for soluble fiber, and 0.001 for insoluble fiber) and TNF-alpha-R2 (P values for trend were 0.002 for total, 0.02 for soluble, and <0.001 for insoluble fibers). Although the samples were small in minority Americans, results were generally consistent with those found among European Americans. We did not observe any significant association between intake of dietary fiber and hs-CRP. CONCLUSION: These findings lend support to the hypothesis that a high-fiber diet is associated with lower plasma levels of IL-6 and TNF-alpha-R2. Contrary to previous reports, however, there was no association between fiber and hs-CRP among postmenopausal women. Future studies on the influence of diet on inflammation should include IL-6 and TNF-alpha-R2 and enroll participants from ethnic minorities.     

Barley and wheat foods: influence on plasma cholesterol concentrations in hypercholesterolemic men.

Twenty-one mildly hypercholesterolemic men aged 30-59 y were provided with comparable barley and wheat foods for each of 4 wk in a crossover-designed experiment. The purpose of the study was to examine the influence of two sources of dietary fiber (nonstarch polysaccharides, NSP) on blood lipids and glucose concentrations. Barley contains beta-glucan as a source of soluble dietary fiber (DF) whereas wheat contains the largely insoluble cellulose and hemicellulose fiber. Total dietary fiber increased from a previous intake of 21-38 g/d during the period of study for the two groups. Consumption of barley relative to wheat foods was associated with a significant fall in both plasma total cholesterol (6%, P less than 0.05) and in low-density-lipoprotein cholesterol (7%, P less than 0.02) whereas triglyceride and glucose concentrations did not change significantly. It is concluded that barley dietary fiber is more effective than wheat dietary fiber at lowering blood cholesterol in hypercholesterolemic men.     

Dietary fiber intakes and insulin requirements in pregnant women with type 1 diabetes

OBJECTIVE: To determine whether higher dietary fiber intake (water soluble and insoluble) is associated with lower insulin requirements and better glycemic control in pregnant women with type 1 diabetes consuming a self-selected diet. DESIGN: A longitudinal, observational study. SUBJECTS: Pregnant women (n=141) with type 1 diabetes participating in an interdisciplinary program examining the effects of glycemic control on pregnancy outcome (Diabetes and Pregnancy Program, University of Cincinnati Medical Center). MEASUREMENTS: We determined total, water soluble and insoluble fiber intakes from 3-day food records kept each trimester during pregnancy. Outcome measures were insulin dose, pre-meal blood glucose, and glycated hemoglobin concentrations. STATISTICAL ANALYSES: Correlation coefficients, multiple regression, mixed-model analysis of variance. RESULTS: Mean intakes (g/day) of total, water soluble fiber, and insoluble fiber were 14.0 (range, 1.8-33.1), 4.8 (range, 0.6-10.5) and 9.0 (range, 1.1-24.0), respectively. In the second and third trimesters of pregnancy, insulin requirements were inversely associated with total, water soluble, and insoluble fiber intakes; the correlation coefficients ranged from -0.22 to -0.17 (P=.02 to .08). Insulin requirements associated with a higher fiber intake (20.5 g/day) were 16% to 18% lower than for a lower fiber intake (8.1 g/day). These relations remained after adjustment for body weight, disease severity and duration, insulin type, and study year in the second (P=.03 to .10) but not in the third trimester. Pre-meal blood glucose and glycated hemoglobin concentrations were not associated with fiber intake. CONCLUSIONS: Among pregnant women with type 1 diabetes, higher fiber intake is associated with lower daily insulin requirements. Dietary fiber intake should be considered when counseling patients about the management of blood glucose concentrations.     

Total n-3 polyunsaturated fatty acid intake is inversely associated with serum C-reactive protein in young Japanese women

Little is known about the relation of dietary factors to circulating C-reactive protein (CRP) concentrations in young adults and non-Western populations. We cross-sectionally examined associations between dietary intake and serum CRP concentrations in young Japanese women. The subjects were 443 female Japanese dietetic students aged 18 to 22 years. Dietary intake was assessed with a validated, self-administered, comprehensive, diet history questionnaire. Serum CRP concentrations were measured by highly sensitive nephelometry. The prevalence of elevated CRP (≥1 mg/L) was 5.6%. After adjustment for possible confounding factors including body mass index, a significant inverse association was seen between total n-3 polyunsaturated fatty acid intake and elevated CRP. The multivariate adjusted odds ratios of elevated CRP for women with intake below and above the median (1.1% of energy) were 1.00 and 0.33 (95% confidence interval, 0.13-0.82; P = .02), respectively. Intake of eicosapentaenoic acid + docosahexaenoic acid and α-linolenic acid was not associated with elevated CRP concentrations (P = .62 and P = .27, respectively). Vitamin C intake was independently inversely associated with elevated CRP, although the association was nonsignificant (P = .10). No clear associations were observed for other dietary factors examined including total fat, saturated fatty acids, monounsaturated fatty acids, polyunsaturated fatty acids, total dietary fiber, soluble dietary fiber, insoluble dietary fiber, and magnesium; fruits, vegetables, and fish and shellfish; and dietary glycemic load (P = .27 to P = .99). In conclusion, total n-3 polyunsaturated fatty acid intake showed an independent inverse association with elevated serum CRP concentration in a group of young Japanese women.     

53例糖尿病患者膳食中膳食纤维的摄入量调查

目的调查糖尿患者总膳食纤维、可溶及不可溶性膳食纤维的摄入量,为糖尿患者膳食纤维营养状况的研究提供重要基础数据。方法通过不同实验室间的比对研究建立膳食纤维酶重量分析方法。采用称重法和食物计量图片法登记53例糖尿患者连续3d每餐的食物摄入种类和重量,利用酶重量法建立的食物中膳食纤维数据库计算膳食纤维摄入的数量和种类。结果3个实验室测定膳食纤维数据的相对标准偏差在2.63%~9.67%之间。调查对象蔬菜类食物摄入量最多,是膳食纤维的主要来源。调查对象总膳食纤维摄入量为(26.5±9.8)g/d,不可溶性膳食纤维摄入量为(14.6±5.8)g/d,可溶性膳食纤维摄入量为(10.4±4.4)g/d。结论本次调查对象的总膳食纤维日摄入量处于美国糖尿病协会推荐摄入量范围内。     

Dietary Fiber Intakes and Insulin Requirements Pregnant Women with Type 1 Diabetes

Objective To determine whether higher dietary fiber intake (water soluble and insoluble) is associated with lower insulin requirements and better glycemic control in pregnant women with type 1 diabetes consuming a self-selected diet.Design A longitudinal, observational study.Subjects Pregnant women (n=141) with type 1 diabetes participating in an interdisciplinary program examining the effects of glycemic control on pregnancy outcome (Diabetes and Pregnancy Program, University of Cincinnati Medical Center).Measurements We determined total, water soluble and insoluble fiber intakes f, om 3-day food records kept each trimester during pregnancy. Outcome measures were insulin dose, pre-meal blood glucose, and glycated hemoglobin concentrations.Statistical analyses Correlation coefficients, multiple regression, mixed-model analysis of variance.Results Mean intakes (g/day) of total, water soluble fiber, and insoluble fiber were 14.0 (range, 1.8-33.1), 4.8 (range, 0.6-10.5) and 9.0 (range, 1.1-24.0), respectively. In the second and third trimesters of pregnancy, insulin requirements were inversely associated with total, water soluble, and insoluble fiber intakes; the correlation coefficients ranged from −0.22 to −0.17 (P=.02 to 0.08). Insulin requirements associated with a higher fiber intake (20.5 g/day) were 16% to 18% lower than for a lower fiber intake (8.1 g/ day). These relations remained after adjustment for body weight, disease severity and duration, insulin type, and study year in the second (P=.03 to 0.10) but not in the third trimester. Pre-meal blood glucose and glycated hemoglobin concentrations were not associated with fiber intake.Conclusions Among pregnant women with type 1 diabetes, higher fiber intake is associated with lower daily insulin requirements. Dietary fiber intake should be considered when counseling patients about the management of blood glucose concentrations. J Am Diet Assoc. 2001; 101: 305-310.     

High-fiber diet reduces serum estrogen concentrations in premenopausal women.

The effect of dietary fiber on serum estrogen concentrations was studied in 62 premenopausal women. Their estimated daily dietary fiber intake was increased from an average of approximately 15 g to 30 g/d by supplementation with wheat, oat, or corn bran. This was done without any significant decrease in dietary fat consumption. After 2 mo on the high-fiber diets, the wheat-bran-supplemented group showed significant reductions in serum estrone (P less than 0.002) and estradiol (P less than 0.02) but no change in serum progesterone or sex-hormone-binding globulin concentrations. The serum estrogens were unaffected by dietary-fiber supplementation with oat or corn brans.     

Development and Validation of a Mobile Phone Application Developed for Measuring Dietary Fiber Intake

We have developed a mobile phone application for measuring the intake of dietary fiber and validated the ability of the application to accurately capture this intake against measurements registered by a dietary record. We also investigated what food groups contributed most to the total, soluble, and insoluble dietary fiber intake. Twenty-six randomly selected Swedish women aged 35–85 years were included and randomized to either start to register dietary intake in the application or by a dietary record, during three consecutive days. After a washout period of at least two weeks, the participants used the other method. We found that the difference in measured mean fiber intake between the dietary record and the application was two grams independent of the total intake per day. A statistically significant correlation between fiber intake as measured by the two methods was found (rho = 0.65, p < 0.001). Vegetables and roots were the predominantly contributing foods to total and soluble fiber intake. Bread and crackers contributed most to insoluble fiber intake. In conclusion, the application may be considered as a useful and easy-to-use method to measure dietary fiber intake.     

Association between dietary fiber and serum C-reactive protein

BACKGROUND: High sensitivity C-reactive protein (CRP) is a marker of acute inflammation recently recognized as an independent predictor of future cardiovascular disease and diabetes. The identification of modifiable factors, such as diet, that influence serum CRP concentrations may provide the means for reducing the risk of these diseases. Data on longitudinal associations between dietary fiber intake and CRP are currently lacking. OBJECTIVE: The purpose of this study was to examine longitudinal associations between dietary fiber intake and CRP. DESIGN: Data collection took place at baseline and quarterly (every 13 wk) thereafter for a total of 5 visits, each including measurements of body composition, CRP, diet, and physical activity. Relations between serum CRP and dietary fiber were assessed by using linear mixed models and logistic regression, adjusted for covariates. RESULTS: A total of 524 subjects had multiple measurements of CRP and dietary factors. The average total dietary fiber intake was 16.11 g/d. Average serum CRP was 1.78 mg/L. We observed an inverse association between intake of total dietary fiber (separately for soluble and insoluble fiber) and CRP concentrations in both cross-sectional and longitudinal analyses. The likelihood of elevated CRP concentrations was 63% lower (OR: 0.37; 95% CI: 0.16, 0.87) in participants in the highest quartile of total fiber intake than in participants in the lowest quartile. CONCLUSIONS: Our results suggest that dietary fiber is protective against high CRP, which supports current recommendations for a diet high in fiber.     

Carob pulp preparation rich in insoluble dietary fiber and polyphenols enhances lipid oxidation and lowers postprandial acylated ghrelin in humans

Ghrelin is an orexigenic hormone that may affect substrate utilization in humans. Ghrelin is influenced by macronutrients, but the effects of insoluble dietary fiber and polyphenols are unknown. We investigated the effects of a polyphenol-rich insoluble dietary fiber preparation from carob pulp (carob fiber) on postprandial ghrelin responses and substrate utilization. Dose-dependent effects of the consumption of carob fiber were investigated in a randomized, single-blind, crossover study in 20 healthy subjects, aged 22-62 y. Plasma total and acylated ghrelin, triglycerides, and serum insulin and nonesterified fatty acids (NEFA) levels were repeatedly assessed before and after ingestion of an isocaloric standardized liquid meal with 0, 5, 10, or 20 g of carob fiber over a 300-min period. The respiratory quotient (RQ) was determined after consumption of 0 or 20 g of carob fiber. Carob fiber intake lowered acylated ghrelin to 49.1%, triglycerides to 97.2%, and NEFA to 67.2% compared with the control meal (P < 0.001). Total ghrelin and insulin concentrations were not affected by consumption of a carob fiber-enriched liquid meal. Postprandial energy expenditure was increased by 42.3% and RQ was reduced by 99.9% after a liquid meal with carob fiber compared with a control meal (P < 0.001). We showed that the consumption of a carob pulp preparation, an insoluble dietary fiber rich in polyphenols, decreases postprandial responses of acylated ghrelin, triglycerides, and NEFA and alters RQ, suggesting a change toward increased fatty acid oxidation. These results indicate that carob fiber might exert beneficial effects in energy intake and body weight.     

Dietary fiber intake and risk of breast cancer by menopausal and estrogen receptor status

Purpose

Evaluate the hypothesis that relation of breast cancer associated with dietary fiber intakes varies by type of fiber, menopausal, and the tumor’s hormone receptor status.

Methods

A case–control study of female breast cancer was conducted in Connecticut. A total of 557 incident breast cancer cases and 536 age frequency-matched controls were included in the analysis. Information on dietary intakes was collected through in-person interviews with a semi-quantitative food frequency questionnaire and was converted into nutrient intakes. Odds ratios and 95% confidence intervals were estimated by unconditional logistic regression.

Results

Among pre-menopausal women, higher intake of soluble fiber (highest versus lowest quartile of intake) was associated with a significantly reduced risk of breast cancer (OR = 0.38, 95% CI, 0.15–0.97, P _trend = 0.08). When further restricted to pre-menopausal women with ER^? tumors, the adjusted OR for the highest quartile of intake was 0.15 (95% CI, 0.03–0.69, P _trend = 0.02) for soluble fiber intake. Among post-menopausal women, no reduced risk of breast cancer was observed for either soluble or insoluble fiber intakes or among ER⁺ or ER^? tumor groups.

Conclusions

The results from this study show that dietary soluble fiber intake is associated with a significantly reduced risk of ER^? breast cancer among pre-menopausal women. Additional studies with larger sample size are needed to confirm these results.     

Validation of a new questionnaire for assessing habitual intake of starch, non-starch polysaccharides, sugars and alcohol

A newly developed food frequency questionnaire designed to estimate habitual intake of non-starch polysaccharide (NSP), intrinsic and extrinsic sugars, starch and alcohol was compared with 4-d weighed records using the semi-automatic Petra system in 154 subjects, men aged 40–69 years and women aged 25–69 years. There was no statistical difference between the two methods for average intake of NSP (soluble and insoluble) intrinsic sugar and Vitamin C. Where a significant difference did occur, notably in extrinsic sugar and starch, it did not exceed 12%, the food frequency questionnaire giving the higher result. With most food components, 4547% were classified in the same tertile and only 54% of subjects were classified in opposite tertiles by the two methods. We conclude that this questionnaire is a valid method of assessing habitual intake of these food components in large groups of subjects.     

Relationship between dietary fiber content and composition in foods and the glycemic index

The dietary fiber content and composition of 25 foods were related to their glycemic index (GI) to see whether the individual components of dietary fiber, specifically soluble fiber, would provide a better predictive capability of the glycemic response than their total dietary fiber content. Total dietary fiber was significantly related to GI (r = 0.461, p less than 0.05). Soluble fiber was not significantly related to GI (r = 0.308), and uronic acids in insoluble fiber were most closely related to GI (r = 0.584, p less than 0.01). Multiple-regression analysis showed that more variation of GI was explained by uronic acids in insoluble fiber (34%) than by total dietary fiber alone (21%, p = 0.05). The combination of pentoses, hexoses, and uronic acids in soluble and insoluble fiber explained only 50% of GI variability. In determining the potential metabolic effects of diet, physiologic assessment of foods is a useful supplement to chemical analysis of their dietary fiber content and composition.     

Fiber Intake and Risk of Nasopharyngeal Carcinoma: A Case-Control Study

Some studies examined the inverse relation between nasopharyngeal carcinoma (NPC) risk and dietary fibers in endemic populations. By means of a hospital-based case-control study, we verified whether this association was also present in Italy in connection with various types of dietary fibers. Cases were 198 patients with incident, histologically confirmed, NPC admitted to major teaching and general hospitals during 1992–2008. Controls were 594 patients admitted for acute, nonneoplastic conditions to the same hospital network of cases. Information was elicited using a validated food frequency questionnaire including 78 foods, food groups, or dishes. Odds ratios (OR) and corresponding 95% confidence intervals (CI) were estimated for quartiles of intake of different types of fiber after allowance for energy intake and other potential confounding factors. Total fiber intake was inversely related to risk of NPC (OR = 0.58 for the highest vs. the lowest quartile of intake; 95% CI: 0.34–0.96). We found an inverse association for total soluble (OR = 0.58; 95% CI: 0.35–0.96) and total insoluble fiber (OR = 0.56; 95% CI: 0.33–0.95), in particular cellulose (OR = 0.57; 95% CI: 0.33–0.96), and lignin (OR = 0.51; 95% CI: 0.31–0.85). In conclusion, this study suggests that dietary intake of soluble and insoluble fibers is inversely related to NPC risk in a nonendemic southern population.     

Evaluation of dietary fibre, soluble and insoluble fibre food intake in Polish households in years 1996-2005

The aim of the study was food intake of dietary fibre and soluble and insoluble fibre intake in years 1996-2005 in six types of households. According to the households budget data, and literature mean values of dietary fiber and its fraction in food products food intakes of these compounds were calculated and compared to recommendations taking into consideration main sources of them. The obtained results indicated that the mean dietary fibre intake was 23.7 g/per person/day (19.9-28.5 g/per person/day). Dietary food intake depended on type of household, and was less dependent on year. The mean soluble fibre intake was 8.8 g/per person/day (7.2-10.5 g/per person/day) and insoluble fibre was 14.9 g/day/person (12.1-18.0 g/per person/day). In researched period we observed small increase soluble fibre intake, however decline insoluble fibre intake. The main food sources of dietary fibre were cereals, especially bakery, but in case of soluble fibre vegetables and fruit and their products.     

227例孕妇膳食调查及维生素营养状况的分析

目的 了解孕妇膳食摄入情况及维生素的营养状况，并提出合理建议，以利于胎儿生长发育。方法 以湖南省长沙市224名孕妇为调查对象，测定了不同孕龄孕妇的血清维生素，并对孕妇的膳食摄入进行调查分析。结果 孕妇膳食三大产热营养素的热能供给比例适宜，但钙、硫胺素、核黄素的摄入量较低；孕妇血清维生素E水平随妊娠进展明显上升，叶酸水平则下降，在孕晚期尤为明显；血清维生素C低于正常值者占40％。结论 叶酸、维生素C、维生素B2为孕妇易缺乏的维生素。     

1989-2006年中国九省(区)居民膳食纤维摄入状况及其变化趋势

目的 分析1989-2006年中国9个省(自治区)18～45岁健康居民膳食纤维的摄入状况、膳食纤维食物来源及其的变化趋势.方法 以1989、1991、1993、1997、2000、2004和2006年中国健康与营养调查项目中连续3 d 24 h回顾法膳食调查数据为基础.将有完整膳食调查资料的18～45岁健康居民作为研究对象,7轮调查的样本量分别为5597、5596、5323、5485、5308、4144和3889名.比较不同时间、性别、地区居民膳食纤维摄入量及其食物来源地变化趋势.结果 9个省(自治区)18～45岁健康居民平均每天不溶性膳食纤维摄入量由1989年的15.1 g/d下降到2000年的11.6 g/d,总膳食纤维摄入量由22.6g/d下降到17.8 g/d.2000年农村男女平均每天不溶性膳食纤维的摄入量分别比1989年减少5.1和5.2 g(2000年分别为13.2、11.8 g;1989年分别为18.3、17.0 g),2006年农村男性和女性平均每天不溶性膳食纤维的摄入量分别为13.5和12.0 g/d.1989-2006年间城市男性和女性平均每日不溶性膳食纤维摄入量分别波动在9.4～11.8 g/d和8.3～10.8g/d,总膳食纤维的摄入量男性和女性分别波动在15.7～17.6和13.5～16.4g/d.城乡居民不溶性膳食纤维和总膳食纤维摄入量的差距呈现缩小的趋势.2006年70.6%(8.4/11.9)的不溶性膳食纤维来自蔬菜[(4.1±3.1)g/d]、面及其制品[(2.6±3.6)g/d]和米及其制品[(1.7±1.3)g/d].结论 1989-2006年9个省(自治区)居民膳食纤维摄入量呈现下降趋势.蔬菜、米、面及其制品是膳食纤维的主要食物来源.

Abstract：

Objective To analyze the status and trend of dietary fiber intake and its food sources among Chinese residents aged 18-45 years old in 9 provinces(autonomous region),from 1989 to 2006.Methods Twenty-four-hour dietary recall data of three consecutive days from China Health and Nutrition Survey(1989,1991,1993,1997,2000,2004 and 2006)were used.And the 18-45 years old subjects with complete information on dietary survey were included.The sample size of these 7 surveys were 5597,5596,5323,5485,5308,4144 and 3889,respectively.The trends of dietary fiber intake and food sources by time and sex were studied.Results From 1989 to 2000,the total of daily dietary fiber intake of 18-45 years old healthy residents decreased from 15.1 g/d to 11.6 g/d,insoluble dietary fiber intake decreased from 22.6 g/d to 17.8 g/d.In villages,from 1989 to 2000,the insoluble dietary fiber intake decreased 5.1 g/d in males and 5.2 g/d in females(13.2,11.8 g in 2000,respectively; 18.3,17.0 g in 1989,respectively).In 2006,the insoluble dietary intake was 12.6 g/d in males and 11.2 g/d in females in villages.In cities,from 1989 to 2006,the insoluble dietary fiber intake was 9.4-11.8 g/d in males and 8.3-10.8 g/d in females.The total dietary fiber intake was 15.7-17.6 g/d in males and 13.5-16.4 g/d in females.The difference of insoluble and total dietary fiber intake between city and village was decreasing.In 2006,70.6%(8.4/11.9)insoluble dietary fiber came from vegetables((4.1 ± 3.1)g/d),wheat flour and its products((2.6 ± 3.6)g/d),rice and its products((1.7 ± 1.3)g/d).Conclusion Dietary fiber intake among Chinese aged 18-45 in 9 provinces(autonomous region)decreased from 1989 to 2006.Vegetables,wheat flour,rice and their products were the major food sources of insoluble dietary fiber.