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EN
Background. A great variety of dietary supplements and fortified products, containing folic acid, are widely available to satisfy the market demand for supplementing the diet with this vitamin. Objective. To assess folic acid intake from dietary supplements and fortified products in students. Materials and methods. The study was performed between October 2010-April 2011 on 314 university students aged 19- 34 years, excluding pregnant or lactating women. Self-administered questionnaire was used to collect information about health, lifestyle and use of dietary supplements during previous month (frequency and doses) and frequency and portion of the fortified products consumed. Results. Diets were supplemented by folic acid by almost 13% of respondents; the average intake was 148 ± 99.7 μg/person/ day, (range 10-400 μg). Products fortified with this vitamin were used by 89% students with an average intake of folic acid 83.7 ± 101 μg/person/day, (range 0.3-660 μg); about a quarter of these subjects were however unaware that they were consuming fortified products. Both product types were used together by 11% students. Among these subjects the average folic acid intake was the highest (233 ± 151 μg/person/day, range 12.3–678 μg); with 66% originating from supplements and 34% from fortified products. There were no instances of folic acid being consumed above the tolerable upper intake level (UL), of 1000 μg/day. Conclusions. It is necessary to warn the public that overconsumption of folic acid, (through dietary supplements, enriched food), may be hazardous to health, since many people combine such multiple products.
PL
Wprowadzenie. Szeroki asortyment suplementów diety i produktów wzbogaconych w kwas foliowy na rynku powoduje, że uzupełnianie diety tą witaminą staje się powszechne. Cel pracy. Oszacowanie spożycia kwasu foliowego w formie suplementów diety i produktów wzbogaconych przez wybraną grupę studentów. Materiał i metody. Badanie przeprowadzono w okresie październik 2010r. – kwiecień 2011r. Wzięło w nim udział 314 studentów w wieku 19-38 lat. Respondenci wypełniali kwestionariusz, który zawierał pytania dotyczące zdrowia, stylu życia, stosowania suplementów diety w ciągu ostatniego miesiąca oraz częstotliwości spożycia produktów wzbogaconych wraz z wielkościami spożywanych porcji. Wyniki. W badanej grupie studentów stosowanie suplementów diety zawierających kwas foliowy zadeklarowało prawie 13% osób, średnie spożycie wynosiło 148 ± 99,7 μg/os/d (zakres 10-400 μg). Natomiast produkty wzbogacone tą witaminą spożywało 89% badanych, średnie spożycie było 83,7 ± 101 μg/os/d (zakres 0,3 - 660 μg). Stwierdzono, iż ponad ¼ respondentów nie była świadoma faktu, że spożywa produkty wzbogacone. Jednocześnie suplementy diety i produkty wzbogacone kwasem foliowym stosowało 11% osób. Średnie pobranie witaminy w tej grupie było najwyższe (233 ± 151 μg, zakres 12,3 – 678 μg). Wnioski. U żadnej osoby spożycie łącznie z obu źródeł nie przekroczyło górnego tolerowanego poziomu (UL). Istnieje potrzeba informowania społeczeństwa o zasadach prawidłowego stosowania dodatkowych źródeł składników odżywczych, aby nie dopuścić do nadmiernego ich spożycia.
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Background. Energy drinks are intended for people who work hard, both physically and mentally, particularly young people engaged in an active lifestyle. Objective. To assess the intake of energy drinks in a student group, during examinations and throughout an academic year. Materials and methods. A survey was performed on 92 students attending the Faculty of Human Nutrition and Consumer Sciences (Warsaw University of Life Sciences - WULS) and those from the Faculty of Physical Education (University of Physical Education - UPE) in Warsaw. Results. Students consumed many more energy drinks during examinations (1424±1577 ml/week) than during the academic year (441±579 ml/week). About 30% more subjects from UPE drank such drinks, throughout both examinations and the academic year, compared to those from WULS. On average, most students drunk less than one can per day. During exams, only 49% students consumed an average of less than 125 ml of energy drinks per day, (WULS; 55% and UPE; 46%), whereas this rose to 84% during the academic year (WULS; 91% and UPA; 80%). The most popular brands were Tiger, Red Bull and Burn. Conclusions. It is important that due care and attention is exercised in consuming high amounts of energy drinks as they contain bioactive substances, including caffeine, inositol, taurine, glucuronolactone and vitamins of the group B. These all have specific effects on the body and can be a cause for concern if their intake is high.
PL
Wprowadzenie. Napoje energetyzujące przeznaczone są dla osób intensywnie pracujących fizycznie i umysłowo, w tym dla ludzi młodych, prowadzących aktywny tryb życia. Cel badań. Przedmiotem pracy była ocena spożycia napojów energetyzujących przez studentów w okresie sesji egzaminacyjnej oraz w czasie roku akademickiego. Materiał i metody. W badaniu wzięło udział 92 studentów Wydziału Nauk o Żywieniu Człowieka (SGGW) oraz Wydziału Wychowania Fizycznego (AWF) w Warszawie. W pracy wykorzystano metodę sondażu diagnostycznego, a materiał do badań zebrano za pomocą autorskiej ankiety. Wyniki. Stwierdzono znacznie wyższe spożycie napojów energetyzujących w czasie sesji egzaminacyjnej (1424±1577 ml/ tydzień) w porównaniu do konsumpcji podczas roku akademickiego (441±579 ml/tydzień). O około 30% więcej studentów AWF niż studentów SGGW piło napoje energetyzujące zarówno w czasie sesji jak i poza nią. Większość studentów spożywała średnio mniej niż 125 ml napojów energetyzujących na dobę. W czasie sesji było to jedynie 49% badanych (SGGW 55%; AWF 46%), zaś poza nią 84% (SGGW 91%; AWF 80%). Do najczęściej wybieranych marek należał ,,Tiger”, ,,Red Bull” oraz ,,Burn”. Wnioski. Należy zwracać uwagę na ilości spożywanych napojów energetyzujących, gdyż zawarte w nich substancje bioaktywne, do których należą kofeina, inozytol, tauryna, glukuronolakton oraz witaminy z grupy B mogą wywoływać określony wpływ na organizm, w zależności od ilości ich spożycia.
EN
Study was based on hypothesis that electrical stimulation (ES) with parameters obtained from analysis of vagal afferent discharge fed state may fake brain with satiety state. We evaluated effect of denervation of vagal capsaicin-sensitive afferents on food intake and body weight in rats with ES of vagal nerves using microchip (MC). Group A was scheduled to MC implantation, B to sham operation only, C to MC implantation and capsaicin vagal deafferentation, and D to capsaicin denervation only. ES lasted 24 days. MC parameters were 0.05Hz, 0.1s, 0.55V. ES of left vagus significantly reduced total food intake as well as the mean daily intake in groups A and C in comparison to control and D group (ANOVA, F=18.55, p=0.0038). Body weight was lower in group A (346,2 g) and C (272,7 g) then in control (381,4 g) and D (356,8 g) (F=25.68, p=0.00068). Leptin decreased in C (165 pg/mL) in comparison to A (625 pg/mL), B (677 pg/mL), and D (612 pg/mL) (p<0,05), mainly due to ES (F=7.27, p=0.019). Glucose was decreased in A (F=5.55, p=0.036) - by 11 % and by 16% in C group. Proper vagal neuromodulation results in central and peripheral effects causing food intake and body weight downregulation.
EN
Leptin interplays with other peptides to control feeding behaviour in humans and animals. Using exendin-4, an agonist of glucagon-like peptide-1, we investigated whether leptin modifies its effect on food intake in the rat. In the first series, exendin-4 alone (0.1, 2 or 10 µg per rat), leptin alone (0.1, 2, 10 or 100 µg per rat) or exendin-4 and leptin together (0.1 + 0.1, 2 + 2, 10 + 10, or 2 + 100 µg per rat, respectively) were injected once intraperitoneally. In the second series animals were injected either with exendin-4 (2 µg) alone, leptin (10 µg) alone, or leptin (10 µg) + exendin-4 (2 µg) daily for 5 subsequent days. At the lowest dose used, leptin and exendin-4 injected once together, but not separately, reduced significantly a 24-hour food intake. When used in higher doses, however, leptin did not change the exendin-4-dependent suppressory effect on food consumption. No significant differences in food intake were seen between rats treated repeatedly with exendin-4 only and animals injected with both drugs. Hence, leptin and exendin-4 may act additively to inhibit appetite when present in low concentrations while, at high leptin doses, this effect is abolished. The lack of synergistic effects of exendin-4 and high leptin concentrations on food intake may explain, at least in part, mechanisms responsible for leptin resistance in subjects with hyperleptinaemia.
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Content available remote Brain-gut axis and its role in the control of food intake
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EN
Gastrointestinal tract (GIT) and nervous system, both central (CNS) and enteric (ENS), are involved in two-way extrinsic communication by parasympathetic and sympathetic nerves, each comprising efferents fibers such as cholinergic and noradrenergic , respectively, and afferent sensory fibers required for gut-brain signaling. Afferent nerves are equipped with numerous sensors at their terminals in the gut related to visceral mechano- chemo- and noci-receptors, whose excitations may trigger a variety of visceral reflexes regulating GIT functions, including the appetitive behaviour. Food intake depends upon various influences from the CNS as well as from the body energy stores (adipocytes) that express and release the product of Ob gene, leptin, in proportion to fat stored and acting in long-term regulation of food intake. Leptin acts through receptors (Ob-R) present in afferent visceral nerves and hypothalamic arcuate nucleus (ARC), whose neurons are capable of expressing and releasing neuropeptide Y (NPY) and agouti related protein (AgRP) that activate the ingestive behaviour through paraventricular nucleus (PVN) (“feeding center”). In addition, to this long-term regulation, a short-term regulation, on meal-to-meal basis, is secured by several gut hormones, such as cholecystokinin (CCK), peptides YY (PYY) and oxyntomodulin (OXM), released from the endocrine intestinal cells and acting via G-protein coupled receptors (GPCR) either on afferent nerves or directly on ARC neurons, which in turn inhibit expression and release of food-intake stimulating NPY and AgRP, thereby inducing satiety through inhibition of PVN. In contrast, during fasting, the GIT, especially oxyntic mucosa, expresses and releases appetite stimulating (orexigenic) factors such as ghrelin and orexins (OX) -A and OX-B, and cannabinoid CB1 agonist. Ghrelin activates growth-hormone secretagogue receptor (GHS-R) in hypothalamic ARC and stimulates growth hormone (GH) release and in vagal afferents to promote the expression and release of hypothalamic NPY and AgRP stimulating PVN and driving ingestive behaviour. The balance and interaction between anorexigenic (CCK, PYY, OXM) and orexigenic (ghrelin and OX) factors originating from GIT appears to play an important role in short-term regulation of food intake and growth hormone (GH) release. An impairment of this balance may result in disorders of feeding behaviour and weight gain (obesity) or weight loss (cachexia).
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Ghrelin and leptin are endogenous peptides that have been implicated in the control of food intake, energy homeostasis and body weight gain. Although the stomach is the major source of circulating ghrelin and partly contributes also to plasma leptin, controversy exists over the influence of gastric Helicobacter pylori (Hp) infection on the ghrelin and leptin release. To resolve this controversy, plasma immunoreactive ghrelin and leptin levels were determined in Hp-positive and Hp negative children (N=60) and in adults (N=120) and daily concentrations of these hormones were measured at 2 h intervals before and after meals. Serum levels of ghrelin and leptin as well as gastrin were measured by RIA. Hp status was assessed using 13C-urea breath test (UBT) and serology. Children with negative UBT showed significantly higher basal serum levels of ghrelin and lower concentrations of leptin than those with positive UBT. Adults without Hp infection also showed significantly higher fasting serum levels of ghrelin and lower levels of leptin than those in Hp infected subjects. In adults, especially without Hp infection, plasma levels of ghrelin showed a marked rise before the meal and sudden decrease following the food intake, while plasma leptin did not showed significant meal-related alterations, but in general its level was significantly higher in Hp positive than Hp negative subjects. Serum gastrin concentrations were significantly elevated in both Hp positive children and adults and these levels were significantly lower in Hp negative subjects. We conclude that Hp infection in children and adults causes a marked reduction in plasma levels of ghrelin, while increasing plasma levels of leptin and gastrin. These alterations in plasma levels of gastric originated appetite-controlling hormones in Hp infected children and adults may contribute to the alterations of the appetite and dyspeptic symptoms observed in these subjects.
EN
Background. Overweight and obesity are metabolic disorders affecting both adults and children. Effective treatment of these conditions is focused on decreasing the body mass, through individually tailored and well balanced diets, along with increasing physical activity. Obese persons often, however, choose high protein diets for losing weight. Recently in Poland, the high-protein Dukan-diet has become very popular. Objectives. To assess dietary consumption in women adopting the Dukan-diet, including intakes of protein, fat, carbohydrate as well as vitamins and minerals. Materials and Methods. Subjects were 51 women aged 19-64 years on the Dukan-diet, who were surveyed by individually conducted interview. Women were asked to provide typical menus from each phase of their diets. Quantitative dietary intake assessment was achieved by an officially used ‘Photograph album of foodstuffs and dishes’ as custom-designed by the National Food and Nutrition Institute (IZZ) in Warsaw. Results. Protein intakes in all subjects were excessive, especially those of animal origin when compared to recommended nutritional standards. In contrast, dietary carbohydrate intakes were low due to poor consumption of fruit and vegetables. Mineral and vitamin intakes revealed high potassium, iron and vitamins A, D and B2, but low vitamin C and folates. Women’s average weight reduction after 8-10 weeks of dieting was approximately 15 kilograms. Conclusions. Many nutritional abnormalities were found in women on the high protein Dukan-diet. Adopting this diet in the long-term may pose health threats through acquiring kidney and liver disease, osteoporosis and cardiovascular disease.
PL
Wprowadzenie. Otyłość i nadwaga są chorobami metabolicznymi, które dotyczą zarówno dorosłych, jak i dzieci. Właściwym postępowaniem w leczeniu tych chorób jest zmniejszenie masy ciała poprzez zastosowanie indywidualnej, dobrze zbilansowanej diety oraz zwiększenie aktywności fizycznej. W celu redukcji masy ciała otyli pacjenci czasami decydują się na zastosowanie diety wysokobiałkowej. W Polsce, w ostatnich latach, bardzo popularna jest wysokobiałkowa dieta Dukana. Cel. Celem badań była ocena sposobu żywienia kobiet stosujących dietę wysokobiałkową Dukana. Oceniono zawartość białek, tłuszczów, węglowodanów, a także witamin i składników mineralnych w diecie badanych kobiet. Materiały i metody. Badanie zostało przeprowadzone za pomocą 24-godzinnego wywiadu przeprowadzonego indywidualnie z każdą respondentką. W badaniu wzięło udział 51 kobiet w wieku 19-64 lat stosujących wysokobiałkową dietę Dukana. Kobiety poproszono o podanie przykładowego jadłospisu z każdej fazy diety. Do oszacowania w wielkości (w gramach) spożytej żywności wykorzystano „Album fotografii produktów i potraw” opracowany przez Instytut Żywności i Żywienia w Warszawie. Wyniki. Kobiety biorące udział w badaniu spożywały nadmierną ilość białka, szczególnie pochodzenia zwierzęcego, w stosunku do zalecanych norm żywieniowych. Zawartość węglowodanów w racjach pokarmowych była niska i wynikała z małej podaży warzyw i owoców. Wśród ocenianych składników mineralnych stwierdzono najniższe spożycie potasu i żelaza, a najwyższe fosforu i sodu. Wykazano także, że ze stosowaną dietą niska była podaż witaminy C i folianów, natomiast wysoka witamin A, D i B2. Wśród badanych kobiet, średnia redukcja masy ciała po 8-10 tygodniach stosowania diety wynosiła około 15 kilogramów. Wnioski. U kobiet stosujących wysokobiałkową dietę Dukana stwierdzono wiele nieprawidłowości żywieniowych. Długotrwałe stosowanie tej diety może zwiększyć ryzyko zdrowotne związane z wystąpieniem chorób nerek i wątroby, osteoporozy oraz chorób sercowo-naczyniowych.
EN
Leptin and glucagon-like peptide-1 (GLP-1) were proved to act in concert to control the activity of feeding centres. Since leptin receptor was identified in the gut endocrine L cells and neurons producing GLP-1, we have checked whether GLP-1 mediates the effects of leptin on feeding and drinking behaviour. To this aim, an intraperitoneal or intracerebroventricular injection of exendin (9 - 39), a GLP-1 antagonist, (50 or 10 µg per rat, respectively) followed by leptin (100 or 5 µg per rat, respectively) was made and 24-hour food intake and body weight changes were measured. Previous injection of exendin (9 - 39) completely abolished the suppressory effect of peripheral leptin on food intake and body weight gain. Moreover, exendin (9 - 39) significantly attenuated the effect of intracerebroventricular leptin on food but not water consumption. It is concluded that intact GLP-1 signalling is necessary to mediate the effect of leptin on food intake in the rat. Conversely, leptin seems to affect the thirst center function independently of GLP-1. Also, these findings produce further evidence for close interactions between long- and short-term factors regulating the activity of feeding centres.
EN
Leptin, 16- kDa protein produced and secreted from white adipocytes is known to regulate food intake and energy expenditure. Leptin receptors have been detected in the pancreas and it has been shown that systemic application of this protein diminished postprandial pancreatic secretion. Leptin is also produced in the stomach and released into the gastrointestinal lumen but the implication of luminal leptin in the regulation of pancreatic enzyme secretion has not been elucidated. The aim of our study was to evaluate the effects of intraduodenal (i.d.) leptin administration on pancreatic enzyme secretion and to assess the involvent of afferent nerves and CCK in above effects. The secretory studies were carried out on anaesthetized Wistar rats with acute pancreatic fistulae. Leptin was administered to the animals at doses of 0.1 1.0 or 10.0 µg/kg i.d. Tarazepide (2.5 mg/kg i.d.), a CCK1 receptor antagonist, was given to the rats prior to the application of leptin. Rats with capsaicin deactivated sensory nerves were used in part of the study. Samples of pancreatic juice were taken at 15 min intervals to measure the volume flow and protein and amylase concentrations. CCK plasma level was measured by radioimmunoassay (RIA) following administration of leptin to the rats. Intraduodenal administration of leptin (1.0 or 10.0 µg/kg) to the fasted rats significantly and dose-dependently increased pancreatic protein and amylase outputs. Pancreatic secretory responses to leptin were totally abolished by prior capsaicin deactivation of sensory nerves or by pretreatment of the rats with tarazepide. Under basal conditions plasma CCK level averaged about 15.46 ± 1,4 pg/ml. Exogenous leptin, given i.d. at doses of 0.1 1.0 or 10.0 µg/kg i.d. to the rats with intact or capsaicin-deactivated sensory nerves resulted in dose-dependent rise of plasma CCK level, reaching the highest value at the dose of 10.0 µg/kg i.d. We conclude that leptin given i.d. stimulates pancreatic enzyme secretion and this effect could be related to the stimulation of CCK release and activation of duodeno-pancreatic reflexes.
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Content available remote Magnetically induced vagus nerve stimulation and feeding behavior in rats
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Vagus nerve (VN) contribute to the bidirectional communication between the gastrointestinal tract and the central nervous system. Stimulation of the VN by a magnetically-driven solenoid with parameters similar to those during food-induced stomach distension has been thought to mimic short-term signaling of satiety and suppress food intake. In this study, the determination of optimal parameters of vagal neuro-modulation to achieve decreased food intake with a resulting reduction in body mass of rats is explored as therapy to treat obesity. The experimental design consisted of three groups of obese adult male Wistar rats: Group 1: VEMF - with solenoid's electrodes placed on the left VN in the magnetic field exposure (MFE); Group 2: EMF - without solenoid's electrodes on the VN in MFE; Group 3: CON - without solenoid's electrodes on the VN outside the MFE. This study suggests that the rats with solenoid's electrodes placed on the left VN significantly decreased their food intake, weight gain and serum leptin concentrations when compared to that of the CON group. PP levels were found to be higher in the VEMF group when compared to the controls groups. It was found that the most effective parameters of vagal stimulation on eating behavior were 3631, 7861, 14523 A2 x h/m2. The magnetic field by unknown mechanisms also influences feeding behavior. This study suggests that vago-vagal reflexes are involved in the feeding homeostasis and that neuromodulation might be an effective method for managing obesity. Further studies are required to confirm these effects in humans.
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