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PubMed2002

Effect of raw wheat germ addition on the physical texture and objective color of a designer food (pan bread).

Pan bread formulations based on raw wheat germ, vital wheat gluten, and enzyme-active soybean flour were optimized with the objective of developing a phytochemical-enriched designer food product with superior nutritional and sensory qualities. The objective texture values (measured as compression force, g) indicated that the test bread with 10% wheat germ addition was comparable (299.9 g) to the control (210.1 g), but the compression force was significantly higher (415.4 g) at 20% wheat germ level. With 0.5% sodium stearoyl-2-lactylate (SSL), 30 ppm potassium bromate and 50 ppm ascorbic acid, the test breads with 10 and 20% wheat germ had compression force values of 313.8 g and 367.7 g, respectively. Comparing the CIE L*a* values, the test bread samples having up to 20% wheat germ were slightly darker in crumb color than the white flour control bread, but were significantly lighter than the whole wheat flour bread. However, the addition of wheat germ increased the yellow color of bread crumb as indicated by the higher b* values of 11.4, 16.4 and 21.4, for control, 10% and 20% wheat germ breads, respectively. The physical texture and objective color measurements can be used in evaluating the quality of a phytochemical-enriched designer food (pan bread). It can be concluded that wheat germ-enriched bread can be prepared by using white flour, 20% raw wheat germ, 0.5% SSL, 30 ppm potassium bromate and 50 ppm ascorbic acid to provide consumers with a functional food.

Bread↗
PubMed2001

The effects of equal-energy portions of different breads on blood glucose levels, feelings of fullness and subsequent food intake.

OBJECTIVE: This study compared the effects of equal-energy portions of 7 different breads on feelings on fullness and subsequent ad libitum food intake. A satiety index score (SI) was calculated for each of the breads. DESIGN: Within-subject, repeated-measures design. SUBJECTS AND INTERVENTION: Ten healthy subjects participated in the study. Subjects fasted for > or =10 hours overnight and then reported to the research center the next morning, where they first completed baseline satiety ratings, gave a fasting blood sample, and then consumed a test bread. Additional finger prick blood samples and satiety ratings were collected at 15-minute intervals over 120 minutes, after which the subjects' ad libitum intake of food was recorded. A satiety index (SI) score was calculated for each test food by dividing the area under the 120-m satiety response curve (AUC) for the test bread by the satiety AUC for the reference bread (regular white bread) and multiplying by 100%. RESULTS: The mean SI scores for the breads ranged from 100% to 561%, with regular white bread having the lowest SI score. Mean SI scores were negatively correlated with energy intake at a test meal after 120 m (r=-0.88, P<.01, n=7) and total day energy intakes (r=-0.72, P<.05, n=7). The strongest predictor of the breads' SI scores was their portion size and thus energy density. The breads' glycemic responses were not significantly associated with fullness responses. APPLICATIONS: Ingredients and food processing methods are available for the production of palatable, high-satiety versions of processed foods, which may be useful for weight control diets. SI scores would be a useful addition to food labels to indicate which foods are less likely to be overeaten and could be used by dietitians to develop weight control plans to help reduce energy intakes without increased hunger.

Adult↗
PubMed1986

Attitudes, norms, intentions and hedonic responses in the selection of low salt bread in a longitudinal choice experiment.

A total of 61 subjects selected a type of bread twice a week, 15 times in all, to be used in their families at home. Four bread types were available: white, wheat, rye and sour rye, each with two sodium chloride levels (normal salt = NS, low salt = LS, half of the normal level). The subjects' attitudes, norms and buying intentions concerning the LS bread were measured at the beginning and at the end of the experimental period. The data were used to test the feasibility of the Fishbein model for the prediction of buying intention and actual selection. In addition, hedonic responses to the breads were measured. The LS bread was selected in 32-39% of cases in all, depending on the bread type. However, there were large individual differences. The proportion of LS breads chosen decreased during the experimental period for all the four bread types. In accordance with this, buying intentions, attitudes and hedonic responses were less favorable to the LS breads by the end of the experiment. Low salt content was best accepted in sour rye breads. The Fishbein model predicted 38% of the buying intentions and 21% of the actual selections (end measurements). When the hedonic response was inserted into the model, the values were improved to 52 and 32%, respectively. It is concluded that the Fishbein model is a useful frame of reference for human food selection studies, and that its predictive power in this particular field of behavior appears to improve substantially when the hedonic response is included in the model.

Adult↗
PubMed2003

Isoflavone profile and biological activity of soy bread.

The present study examines the ability of isoflavone extracts from whole soy bread and two soy bread fractions, crumb and crust, to modulate the proliferation of human prostate cancer PC-3 cells. Total isoflavone content in the two fractions of soy bread were similar (3.17 micromol/g dry basis). However, their conjugate patterns were altered. Both fractions of soy bread contained a similar level of isoflavone aglycones ( approximately 24%). Low concentrations of soy bread extracts increased PC-3 cell proliferation as much as 47% compared to untreated control. This proliferative effect in cell growth was reduced at higher extract concentration. Soy bread crust extract (10 mg/mL) reduced PC-3 cell proliferation by 15% compared to untreated control. Interestingly, wheat bread extracts increased cell proliferation at all concentrations tested. Although extracts from both breads possessed biological activity, only soy bread crust extract reduced PC-3 cell proliferation. This observation may be related to the presence of soy in this bread.

Bread↗
PubMed1976

Folate content of Iranian breads and the effect of their fiber content on the intestinal absorption of folic acid.

Folate deficiency is a relatively uncommon disorder in central Iran. In order to explain this finding; the acid content of various Iranian breads was determined, since bread is the staple food in Iran. Tanok, the village wholemeal bread, has an average "free" folate content (without conjugase incubation) of 0.34 mug/g. Sangask and Bazari, leavened breads made from flours of high extraction rates and widely consumed in towns and cities, have aberage "free" folate contents of 0.38 and 0.71 mug/g, respectively. The folate content of these breads are significantly higher than that of white bread from refined flour (0.13 mug/g) or oatmeal bread (0.09 mug/g). Iranian breads also have a high content of indigestible fiber (1.6 to 4.2% of dry weight). Since substances within the bread, such as fiber, may interfere with folate absorption by the small intestine, sequential folate absorption tests (tritiated pterolymonoglutamic acid) were performed in four subjects with meals of increasing fiber content and fasting. No interference with folate absorption was found. Furthermore, in vitro studies did not demonstrate the formation of insoluble complexes between bread fiber and folic acid, which might indicate decreased availability.

Bread↗
PubMed2000

Rye bread improves bowel function and decreases the concentrations of some compounds that are putative colon cancer risk markers in middle-aged women and men.

Cereal fiber may reduce the risk of colorectal cancer by diluting colonic contents due to increased fecal output, by accelerating intestinal transit, by increasing fecal frequency and by altering bacterial metabolism. The effects of whole-meal rye bread on some putative colon cancer risk markers were investigated in 17 healthy Finnish subjects using a randomized crossover trial with two 4-wk bread consumption periods and a 4-wk washout period between the bread periods. White wheat bread was used as a control. Test breads covered a minimum of 20% of the daily energy intake (range, 4330-14, 033 kJ/d). Intestinal transit time, stool weight, fecal bacterial enzyme activities and short-chain fatty acid, ammonia, diacylglycerol (DAG) and bile acid concentrations in feces (expressed per gram wet feces) were measured. Whole-meal rye bread significantly increased fecal output and fecal frequency and shortened mean intestinal transit time compared with wheat bread in both women and men. Activities of beta-glucuronidase and beta-glucosidase (expressed per gram wet feces) were significantly lower in men and urease activity significantly higher in women during the rye bread period (RBP). Fecal butyrate concentration was higher during the RBP in men. Fecal ammonia and DAG concentrations did not differ between bread periods. Fecal total and secondary bile acid concentrations were significantly lower during RBP in both women and men. This study shows that whole-meal rye bread significantly improves bowel function in healthy adults and may decrease the concentration of some compounds that are putative colon cancer risk markers.

Adult↗
PubMed2002

Soluble dietary fibres in Jerusalem artichoke powders: composition and application in bread.

Powders of tubers from Jerusalem artichoke (Helianthus tuberosus, L.), cultivar Gigant, of different harvesting times (autumn and spring) were applied in bakery products, particularly in wheat/rye bread. The quality of this bread was compared to bread with cereal flours substituted with commercial products as Raftilin ST and Raftilose P95. Compared to standard and substituted bread, Jerusalem artichoke bread shows a high quality in organoleptic evaluation (grade I with 36.5 and 37.5 scores). In utilised Jerusalem artichoke powders (JAPs) the amount of fructan (inulin) hydrolysis to fructose during the baking process depends on its initial degree of polymerisation (dp). With JAP of autumn harvest (fructan: dpn = 9.9, dpw = 21.8) less fructose (24.6%) is formed than with those of spring harvest (fructan: dpn = 4.9, dpw = 7.1) (40.7%). Compared to this bread, substitution with commercial products Raftilin ST (inulin: dpn = 8.4, dpw = 17.4) and Raftilose P95 (fructo-oligosaccharides: dpn = 2.7, dpw = 3.0) yields 11.9% and 45.8% of fructose upon total hydrolysis, respectively. The loss of fructan content by the bakery process is 38% in bread with JAP of autumn and 43% in bread with JAP of spring harvest; Raftilin ST- and Raftilose P95-bread come up with loss of fructan content of 35% and 47%, respectively.

Bread↗
PubMed1992

Fecal bile acid metabolic pattern after administration of different types of bread.

Increased concentrations of fecal bile acids have been suggested to be associated with increased risk of colorectal cancer. Fecal bile acid profiles were determined in 12 healthy Finnish women who included in their normal diets for 2-week periods in turn three different types of bread, 200-300 g/day. The breads contained either low-fiber wheat, whole-meal wheat, or whole-grain rye. During consumption of rye bread, the total mean concentration of fecal free bile acids was 4.77 +/- 0.90 mumol/g of dry feces (mean +/- SEM), which was much lower than with the normal omnivorous diet (8.05 +/- 1.56 mumol/g) or during administration of the low-fiber wheat bread (8.83 +/- 1.56 mumol/g) or the whole-meal wheat bread (7.88 +/- 1.34 mumol/g) (P less than 0.05). This decrease was mainly caused by increased proportions of saponifiable bile acids (P less than 0.01). During intake of the whole-grain rye bread, 46% +/- 3% of the fecal bile acids were in their saponifiable forms; this percentage was 30% +/- 3% during the control period, 30% +/- 4% during the low-fiber wheat bread period, and 27% +/- 4% during the whole-meal wheat bread period. It is concluded that the type of bread significantly effects concentrations of cocarcinogenic and comutagenic free lithocholic and deoxycholic acids by changing modes of conjugation in the gut.

Adult↗
PubMed1996

Oat bran concentrate bread products improve long-term control of diabetes: a pilot study.

OBJECTIVE: To evaluate the long-term effects oat bran concentrate bread products in the diet of free-living subjects with non-insulin-dependent diabetes (NIDDM) via dietary, clinical, and biochemical methods. DESIGN: A 24-week crossover study consisting of two 12-week periods. SUBJECTS/SETTING: Eight men with NIDDM (mean age = 45 years) who lived in the community. Glucose and insulin profiles were conducted in a clinical investigation unit. INTERVENTION: Palatable, high-fiber, oat bran concentrate (soluble fiber [beta-glucan] content = 22.8%) bread products were developed. Four randomly chosen subjects ate oat bran concentrate breads first; the other subjects ate control white bread first. MAIN OUTCOME MEASURES: Dietary intake (four 48-hour dietary recalls per period) was assessed. Blood glucose and insulin (8-hour profiles) and lipid parameters after fasting were measured (at 0, 12, and 24 weeks). STATISTICAL ANALYSES PERFORMED: Analysis of variance and repeated-measures analysis of variance. RESULTS: Total energy and macronutrient intakes were similar in both periods. Mean total dietary fiber intake was 19 g/day in the white bread period and 34 g/day (9 g soluble fiber per day from oat bran concentrate) in the oat bran concentrate period. Body weight remained stable. Mean glycemic and insulin response areas (area under the curve) were lower (P < or = .05 and not significant, respectively) for the oat bran concentrate period than the white bread period. After breakfast, area under the curve for the oat bran concentrate period was lower for glucose (P < or = .01) and insulin (P < or = .05); insulin peak was reached earlier (P < or = .05) than in the white bread period. Dietary fiber intake was correlated negatively with insulin area under the curve (P < or = .05). Mean total plasma cholesterol and low-density lipoprotein cholesterol levels were lower (P < or = .01) in the oat bran concentrate period than in the white bread period. In the oat bran concentrate period, the mean ratio of low-density lipoprotein cholesterol to high-density lipoprotein cholesterol was reduced by 24% (P < or = .05). CONCLUSIONS: The well-accepted oat bran concentrate bread products improved glycemic, insulinemic, and lipidemic responses.

Adult↗
PubMed2001

Effect of spelt wheat flour and kernel on bread composition and nutritional characteristics.

Spelt wheat seeds (Triticum aestivum subsp. spelta cv. Ostro) were used to obtain white spelt flour (64.5% yield), wholemeal spelt flour (100% yield), and scalded spelt wheat kernels. From these materials, white spelt wheat bread (WSB), wholemeal spelt wheat bread (WMSB), and spelt wheat bread with scalded spelt wheat kernels (SSKB) were made and were compared to the reference white wheat bread (WWB). The spelt wheat flours and breads contained more proteins in comparison to wheat flour and bread. Among the samples the highest rate of starch hydrolysis was noticed in WSB. During the first 30 min of incubation this particular bread was shown to have significantly more (P < 0.05) rapidly digestible starch than the WMSB and later on also more starch than in WWB and SSKB, respectively. The WMSB had the lowest hydrolysis index (HI = 95.7). However, the result did not differ significantly from that in the reference common wheat bread. On the other hand, the most refined spelt wheat flour resulted in a bread product (WSB) that was statistically withdrawn (P < 0.05) as one with the highest HI (112.6).

Bread↗
PubMed2004

Folate content in commercial white and whole wheat sandwich breads.

After the U.S. mandate of folic acid fortification of enriched grain products, a report indicated higher than expected fortification. Limited information is available on folic acid in enriched products. We measured the folate content in 92 sandwich breads (46 white breads and 46 whole wheat breads) in Birmingham, Alabama, during 2001-2003. The mean folate content in white bread declined significantly from 2001 to 2002 or 2003, whereas the decline in folate content in whole wheat bread containing enriched flour was not significant. White bread contained significantly more folate than whole wheat bread containing enriched flour in 2001 and 2003. In 2002 and 2003, >40% of breads made of enriched flour contained <115 microg of folate/100 g and >70% contained <160 microg/100 g. These percentages were markedly higher than those in 2001. Our data suggest that folic acid in breads containing enriched flour declined after 2001 and monitoring of fortification may be necessary.

Bread↗
PubMed2006

Effect of bread baking on the bioavailability of hydrogen-reduced iron powder added to unenriched refined wheat flour.

Elemental iron powders are widely used to fortify flour and other cereal products. Our objective was to test the hypothesis that baking enhances the bioavailability of elemental iron powders by oxidizing Fe(0) to Fe(2+) or Fe(3+). An in vitro digestion/Caco-2 cell culture model and a piglet model were used to measure bioavailability. Bread flour, either unfortified or fortified with hydrogen-reduced (HR) iron powder or FeSO(4) (300 mg Fe/kg flour), was baked into bread. For the in vitro studies, bread samples were treated with pepsin at pH 2, 3, 4, 5, 6, or 7 and subsequently incubated with pancreatic enzymes at pH 7 in a chamber positioned above monolayers of cultured Caco-2 cells. Ferritin formation in the cells was used as an index of iron bioavailability. Ferritin formation in cells fed HR Fe bread was similar to cells fed FeSO(4) bread when the peptic digestion was conducted at a pH 2 but lower when the peptic phase was conducted at pH 3, 4, 5, 6, or 7 (P < 0.05). Pig diets containing 35% dried bread were prepared and fed to cross-bred (Hampshire x Landrace x Yorkshire) anemic pigs in two studies. The rate of increase in hemoglobin Fe over the feeding period was used to calculate relative biological value (RBV), an index of iron bioavailability. In the first pig study, RBV of HR Fe added to flour prior to baking was 47.9% when compared to FeSO(4) fortified flour (P < 0.05). In the second pig study, a third treatment consisting of unfortified bread with HR iron added during diet mixing (after bread baking) was included. RBVs of the HR Fe diet (Fe added after baking) and HR Fe diet (Fe added before baking) were 40.1% and 53.5%, respectively, compared to the FeSO(4) diet. Differences in RBV between the HR Fe (before and after baking) and FeSO(4) (before baking) treatment groups were significant, but the difference between the before and after HR treatment groups was not significant. We conclude that bread baking does not enhance the bioavailability of elemental iron powders.

Animals↗
PubMed1982

The effect of different levels of wheat bran on iron absorption in rats from bread containing similar amounts of phytate.

1. Iron absorption was studied in weanling rats using balance techniques from semi-synthetic diets containing dried white bread (60.5 g dietary fibre/kg. White & Southgate, unpublished results), brown bread (130.2 g dietary fibre/kg) or wholemeal bread (221.2 g dietary fibre/kg) at a level of 300 g/kg and compared with a control group given a diet containing added FeSO4 at a similar Fe level to that for the bread groups. The dried bread contained 6.2-6.4 g phytate/kg. 2. Absorption of Fe was significantly higher (P less than 0.001) in the control group (0.45) than in the White (0.28), brown (0.31) or wholemeal (0.24) groups. 3. A second experiment was carried out on 6-week-old rats in which the dried bread was extrinsically labelled with 59Fe and absorption from a single meal measured by both faecal excretion and incorporation of 59Fe into the blood. Control animals were given 59FeSO4 for comparison. 4. The excretion of 59Fe (% of administered dose) was significantly lower (P less than 0.001) in the control group (31) than in the white (48), brown (45) or wholemeal (47) groups. After 10 d the control group had significantly more 59Fe in the blood than the bread groups, but there were no differences between the bread groups. 5. It appears that wheat bran fibre itself has no effect on the retention of Fe from the diet in the rat, when supplied in amounts similar to those found in commercially-available bread.

Absorption↗
PubMed1994

Bread as a source of salt: an international comparison.

OBJECTIVE: The salt (NaCl) content of bread, obtained from Belgium and 25 other regions or countries worldwide, was analyzed to evaluate the importance of bread as a source of dietary salt in a population. METHODS: A total of 1166 dried bread samples were analyzed using a hot HCl extraction technique followed by flame photometry and performed by the same laboratory technician in Leuven (Belgium); 534 samples from Leuven were analyzed over 10 time periods from 1967-73 to 1992 together with 562 samples from 11 other European countries, 44 from the United States and Peru, and 26 from Asia. RESULTS: The average mean salt content of fresh bread (= dried bread times 0.6) in European countries was 12.4 +/- 1.7 g/kg for white and 13 +/- 1.0 g/kg for brown bread. In Japan and Korea it was about 8.5 g/kg and in Pakistan, Thailand, Nepal, and Laos about 5 g/kg. The mean sodium/potassium ratio with Na and K in mmol was 8.0 for white and 4.5 for brown bread, much higher than the recommended value of 1.0. Bread with a very low salt content was found in certain areas of Peru, Spain, and Italy. CONCLUSION: The overall salt content of bread in Western countries is excessive, and a gradual reduction is highly desirable.

Asia↗
PubMed1999

Breath hydrogen and methane responses of men and women to breads made with white flour or whole wheat flours of different particle sizes.

OBJECTIVE: While it is well known that consumption of whole grain foods results in beneficial health effects, the great majority of Americans prefer bread made with white flour. Consumption of whole grain foods in high fiber menus may cause undesirable intestinal responses. The purpose of this study was to determine whether consumption of bread made with ultra fine ground whole wheat flour retained beneficial effects while reducing undesirable effects. METHODS: Twenty-six men and women (31 to 55 years of age) consumed glucose solutions or bread made with white, whole wheat or fine ground whole wheat flour (1 g carbohydrate/kg body weight) in a Latin square design after two days of controlled diet. Breath methane and hydrogen were determined over the 24 hours after consumption of test foods. RESULTS: Hydrogen and methane responses of men and women were similar. There were no significant differences in methane responses to the different treatments, but hydrogen response was increased by all breads (p<0.0001). Although the overall mean response values were similar for all three breads, the patterns of hydrogen response differed (treatment*time, p<0.003). Gastrointestinal symptoms were not associated with fiber content or particle size of bread; however, subjects reporting symptoms tended to have higher methane responses (0.05<p<0.10). CONCLUSION: Neither fiber content of bread nor particle size of whole wheat flour substantially affected breath hydrogen or methane responses or gastrointestinal symptoms. Fine ground whole wheat breads may provide a more acceptable food choice than standard whole wheat bread without sacrificing the beneficial health effects of higher fiber.

Adult↗
PubMed2005

In vitro carbohydrate digestibility of whole-chickpea and chickpea bread products.

Pulses such as the chickpea are generally considered to be valuable dietary sources of slowly digestible starch, a form of starch that is considered beneficial to health since it results in relatively low post-meal blood glucose levels compared with more rapidly digested starch. The development of novel chickpea-based foods is necessary to help expand the worldwide consumption of the chickpea. However, the effect of different processing methods on the starch digestibility of chickpea-based foods has not been widely investigated. This study used an in vitro method simulating human carbohydrate digestion to determine levels of slowly digestible starch, rapidly digestible starch (RDS), resistant starch, total starch and rapidly available glucose (RAG) of: (i) whole-chickpea products (domestically boiled, commercially canned and commercially precooked/vacuum-packaged); and (ii) standard white bread, chickpea flour bread (25% replacement of wheat flour by chickpea flour) and extruded chickpea flour bread (25% replacement of wheat flour by extruded chickpea flour). The RAG levels were then used to predict the relative in vivo glycaemic indices of the products. The commercially precooked/vacuum-packaged whole chick peas demonstrated higher levels of RDS than the commercially canned and domestically boiled products (P<0.05). In addition, the domestically boiled product had lower levels of RAG (g/100 g available carbohydrate) compared with the canned and precooked/vacuum-packaged products (P<0.05). There were no significant differences between any of the carbohydrate digestibility measures of the white bread, chickpea flour bread and extruded chickpea flour bread (P>0.05) and all bread products demonstrated far higher RAG (g/100 g available carbohydrate) values than the whole-chickpea products. The findings suggest that the commercially precooked/vacuum-packaged whole chick peas and the canned product may have higher and less beneficial glycaemic indices than the domestically boiled chick peas. It appears unlikely that the use of chickpea flour or extruded chickpea flour, at the incorporation rate investigated in this study, would modify the glycaemic index of bread. It is probable, however, that the chickpea bread products investigated would demonstrate higher and potentially less beneficial glycaemic indices than the whole-chickpea products.

Bread↗
PubMed1980

Zinc absorption from composite meals. I. The significance of whest extraction rate, zinc, calcium, and protein content in meals based on bread.

The absorption of zinc in man from composite meals based on bread was measured with a radionuclide technique using 65Zn and whole-body counting. Bread was made up from wheat flour of 100 and 72% extraction rate. A lower absolute amount of zinc was absorbed from the white bread compared to the absorption from the same amount of wholemeal bread. When the two types of bread were enriched with zinc chloride the absorption was higher from the white bread than from the wholemeal bread. Addition of calcium in the form of milk products improved the absorption of zinc from a meal with wholemeal bread. A significant positive correlation was found between zinc absorption and the protein content in meals containing milk, cheese, beef, and egg in various combinations with the wholemeal bread.

Absorption↗
PubMed1976

Effect of feeding lysine and threonine fortified bread during gestation and lactation on growth of the brain in rats.

First and second litter offspring brain development was studied following the feeding of bread, bread plus lysine, or bread plus lysine and threonine to rats during pregnancy and lactation. Results were compared with offspring brain growth following maternal consumption of a stock diet, 13% casein or 26% casein diet. Brain weight, protein and cellularity progressively increased as lysine and lysine plus threonine were added to the maternal bread diets. The bread plus lysine and threonine diet resulted in similar or higher total weight, protein and DNA values for all brain areas in comparison with results from the stock diet or 13% casein diet. The 26% casein diet resulted in greater brain weight, protein and DNA values in comparison to the bread, bread plus lysine, 13% casein, or stock diets. First litter pups whose mothers were fed the 26% casein diet, in comparison to the bread plus lysine and threonine diet, had higher or similar brain weight and DNA levels. For second litter pups, all values were similar for both diets with the exceptions of lower brain stem weight for 26% casein and lower cerebellum DNA for bread plus lysine and threonine.

Animals↗