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PubMed2003

Trend to better nutrition on Australian hospital menus 1986-2001 and the impact of cook-chill food service systems.

OBJECTIVE: To assess trends in the nutritional quality of hospital menus and examine differences between menus used in hospitals with cook-chill or cook-fresh food services. DESIGN: Standard patient menus were analysed against 28 criteria to assess nutritional standards and compared with results from similar studies in 1986 and 1993. SETTING: Menus were collected from 80 hospitals in New South Wales (NSW), Australia, including 36 using cook-chill food service systems. STATISTICAL ANALYSIS: Chi-squared analysis was used to assess differences between the proportions of hospitals meeting the criteria in 1993 and 2001, and between different types of hospitals. RESULTS: In 2001, compared with 1993, significantly many hospitals offered more than one hot choice at the evening meal, more menus highlighted low fat items and more calcium-rich foods were available. More than 90% of hospitals allowed patients to select their own menu, offered wholemeal breads and high-fibre breakfast cereals, fresh fruit, polyunsaturated margarine, a milk dessert at least once a day and two or more hot options at the midday meal. Hospitals with cook-chill food services had menus that were more likely to meet nutritional recommendations, although they were less likely to offer a choice of serving size. A high proportion of unpopular choices were offered in menus, especially meat dishes and desserts. APPLICATIONS/CONCLUSION: Since 1986, NSW hospital menus have improved to offer choices that conform better to dietary guidelines. Cook-chill food services may have positive and negative impacts on meal choices. The assessment criteria are useful in hospitals to assess their menus.

Australia↗
PubMed1996

The effect of cooking on veterinary drug residues in food: 4. Oxytetracycline.

The heat stability of oxytetracycline (OTC) in water and vegetable oil was investigated. Results showed that the drug was unstable in water at 100 degrees C with a half-life of about 2 min, but more stable in oil at 180 degrees C where the half-life was about 8 min. The effect of a range of cooking processes including microwaving, boiling, roasting, grilling, braising and frying on OTC residues in incurred animal tissues was investigated. Substantial net reductions in OTC of 35-94% were observed, with temperature during cooking having the largest impact on the loss. Migration from the tissue into the surrounding liquid or meat juices was observed during the cooking processes. Diode-array analysis of heat-treated OTC standard solutions indicated that no individual closely related compound such as 4-epioxytetracycline, alpha- or beta-apooxytetracycline formed a significant proportion of the breakdown products. OTC was not evenly distributed throughout the tissue, but the effects of this were minimized by selecting adjacent samples for cooking and for the raw control. The findings of this investigation showed that the effect of cooking on residues of OTC should be considered before data obtained from measurements on raw tissue are used for consumer exposure estimates and dietary intake calculations.

Animals↗
PubMed2006

The use of video self-modelling and feedback to teach cooking skills to individuals with traumatic brain injury: a pilot study.

OBJECTIVE: To evaluate the effectiveness of video self-modelling plus prompting and feedback to teach a cooking skill to people with traumatic brain injury (TBI) and to examine skill generalization to a novel food item. RESEARCH DESIGN: Multiple probe across participants. METHODS AND PROCEDURES: Four individuals with TBI received instruction in cooking. They watched videotapes of themselves cooking and practiced that skill while receiving prompts and feedback. Treatment effects were evaluated by comparing performance before, during and after training and at a 2 and 4 week follow-up. Additionally, cooking performance on a novel food item was examined. MAIN OUTCOMES AND RESULTS: Three of the four individuals achieved criterion performance within four training sessions. Those individuals also substantially maintained their skills 2 and 4 weeks following training and generalized their skills to a novel food item. CONCLUSIONS: Video self-modelling plus prompting and feedback appears to be an effective treatment for teaching simple cooking skills to individuals with TBI. Further research should examine whether the video alone is sufficient for skill acquisition and evaluate the effectiveness of video self-modelling to teach other skills.

Adolescent↗
PubMed2005

Cooking smoke and tobacco smoke as risk factors for stillbirth.

Smoke from biomass combustion produces some of the same pollutants found in tobacco smoke and ambient air, yet only one study to date has linked cooking with biomass fuels to increased risk of stillbirth. The mechanisms by which biomass smoke may cause stillbirth are through exposure to CO and particulates in biomass smoke. Using information on 19,189 ever-married women aged 40-49 included in India's 1998-99 National Family Health Survey, we examined the association between household use of biomass fuels (wood, dung, and crop residues), tobacco smoke (both active and passive), and risk of stillbirth. Data were analyzed using binary and multinomial logistic regression after controlling for several potentially confounding factors. Results indicate that, with other factors controlled, women who cook with biomass fuels are significantly more likely to have experienced a stillbirth than those who cook with cleaner fuels (OR= 1.44; 95% CI: 1.04, 1.97). Women who cook with biofuels are twice as likely to have experienced two or more stillbirths as those who cook with cleaner fuels (RRR= 2.01; 95% CI: 1.11, 3.62). The adjusted effect of active tobacco smoking is also positive (OR = 1.23) but not statistically significant. No effect of passive smoking was found, nor was there evidence of any modifying effects of tobacco smoking.

Adult↗
PubMed2002

Proximate and mineral compositions of cooked and uncooked Solanum melongena.

The proximate and mineral compositions of four different varieties of cooked and uncooked Solanum melongena were determined. Except for the percentage moisture, the levels of crude protein, crude fat, total ash and carbohydrate content were generally higher in uncooked samples than in cooked samples. Solanum macrocarpum (uncooked) has the highest moisture content with an average value of 73.9% and 84.5% for coat and flesh respectively, while the coat of Solanum sessiliflorum and flesh of Solanum aethiopicum have the least moisture content with average values of 60.0% and 69.5% respectively. The mineral components in the uncooked samples were generally found to be higher than those observed in the cooked samples. Solanum sessiliflorum has the highest value for nearly all the minerals for both the cooked and uncooked samples, while Solanum aethiopicum has the lowest value. The mineral contents were found to be higher in the coat than the flesh in most of the samples. Sodium and potassium were found to be the most abundant cations in both the coat and the flesh of cooked and uncooked fruits.

Cooking↗
PubMed2002

Human 8-oxoguanine DNA glycosylase 1 mRNA expression as an oxidative stress exposure biomarker of cooking oil fumes.

Epidemiological studies have indicated that the exposure to carcinogenic components formed during the cooking of food might be associated with lung cancer risk of Chinese women. Previous studies have confirmed that cooking oil fumes from frying fish (COF) contained relatively high amount of benzo[a]pyrene, 2-methyl-3,8-dimethylimidazo[4,5-f] qunoxaline, benzene, and 1,3-butadiene, reported in fumes from heated soybean oil. Thus, we consider that oxidative stress induced by COF may play a role in lung cancer development among Chinese women. To verify whether the oxidative DNA damage was induced by COF, high-performance liquid chromatography (HPLC) analysis data showed that the levels of 8-hydroxydeoxyguanine (8-OH dG) were increased in a dose-dependent manner when calf thymus DNA reacted with various concentrations of COF. Since human 8-oxoguanine DNA glycosylase 1 (hOGG1) was a repair enzyme for removing 8- OH dG from damaged DNA, we hypothesized that hOGG1 mRNA may be used to assess the risk of oxidative damage induced by the exposure of COF. The results from reverse-transcription polymerase chain reaction showed that the hOGG1 mRNA expression was induced by hydrogen peroxide (H2O2) and COF in human lung adenocarcinoma CL-3 cells. To elucidate whether hOGG1 mRNA expression was an exposure biomarker of COF, a cross-sectional study of 238 subjects including 94 professional cooks, 43 housewives, and 101 COF-nonexposed control subjects was conducted. The hOGG1 mRNA expression frequencies of COF-exposed cooks (27 of 94, 28.7%) and housewives (6 of 43, 14%) were significantly higher than those of control subjects (4 of 101, 4%). After adjusting for age, sex, and smoking and drinking status, the odds risks (ORs) of housewives versus control and cooks versus control were 3.94 (95% confidence interval [CI] = 0.95-16.62) and 10.12 (95% CI = 2.83-36.15), respectively. These results indicated that hOGG1 may be adequate to act as an exposure biomarker to assess the oxidative DNA damage induced by COF. This also suggests that oxidative stress induced by COF may play a role in lung cancer development among Chinese women.

Adenocarcinoma↗
PubMed1999

Heterocyclic amine content of cooked meat and risk of prostate cancer.

BACKGROUND: Some epidemiologic studies have described positive associations between prostate cancer risk and meat consumption, but underlying mechanisms have not been identified. Heterocyclic amines are mutagens formed during the cooking of meat. Well-done meat has been associated with increased risks of colorectal and breast cancers in humans. This study examined associations between prostate cancer risk and 1) estimated daily intake of heterocyclic amines from cooked meat and 2) level of cooked-meat doneness. METHODS: A population-based, case-control study involving 317 case patients with prostate cancer and 480 age-matched control subjects was carried out in Auckland, New Zealand. Levels of meat doneness and daily intake of heterocyclic amines were determined from self-reported dietary data and experimentally measured heterocyclic amine levels in locally sourced meat samples cooked under controlled conditions to varying degrees of doneness. RESULTS: The heterocyclic amines found in the highest concentrations in meat samples were 2-amino-1,6-dimethylfuro[3,2-e]imidazo[4,5-b]pyridine (IFP) and 2-amino-1-methyl-6-phenylimidazo [4,5-b]pyridine (PhIP) from well-done chicken and pork and very well-done beefsteak. Meat doneness was weakly and inconsistently associated with prostate cancer risk for individual types of meat, but increased risk was observed for well-done beefsteak (relative risk = 1.68; 95% confidence interval = 1.02-2.77; two-sided P for trend =.03). A weak positive gradient of increased risk was associated with estimated daily exposure to IFP but not with the other major heterocyclic amines. CONCLUSIONS: Meat doneness and estimated intake of heterocyclic amines from cooked meat were not clearly associated with prostate cancer risk.

Adult↗
PubMed2005

Shelf life and safety aspects of chilled cooked and peeled shrimps (Pandalus borealis) in modified atmosphere packaging.

AIMS: To evaluate the growth of Listeria monocytogenes and shelf life of cooked and peeled shrimps in modified atmosphere packaging (MAP). METHODS AND RESULTS: Storage trials with naturally contaminated cooked and peeled MAP shrimps (Pandalus borealis) were carried out at 2, 5 and 8 degrees C. Challenge tests at the same conditions were performed after inoculation with Listeria monocytogenes. Both storage trials and challenge tests were repeated after 4 months of frozen storage (-22 degrees C). Brochothrix thermosphacta and Carnobacterium maltaromaticum were responsible for sensory spoilage of cooked and peeled MAP shrimps. In challenge tests, growth of L. monocytogenes was observed at all of the storage temperatures studied. At 5 and 8 degrees C the concentration of L. monocytogenes increased more than a 1000-fold before the product became sensory spoiled whereas this was not observed at 2 degrees C. Frozen storage had only a minor inhibiting effect on growth of L. monocytogenes in the thawed product. CONCLUSIONS: To prevent L. monocytogenes becoming a safety problem, cooked and peeled MAP shrimps should be distributed at 2 degrees C and with a maximum shelf life of 20-21 d. At higher temperatures shelf life is significantly reduced. SIGNIFICANCE AND IMPACT OF THE STUDY: Information is provided to establish shelf life of cooked and peeled MAP shrimps.

Colony Count, Microbial↗
PubMed1998

Epicondylitis among cooks in nursery schools.

OBJECTIVES: To investigate the prevalence and risk factors of epicondylitis among cooks in nursery schools in a cross sectional study because they are suspected to have strenuous workloads on the hands and arms. METHODS: Prevalence of epicondylitis among 209 nursery school cooks and 366 control workers aged 40-59 were studied. Both groups consisted of women workers chosen from 1299 subjects who agreed to participate from 1329 social welfare employees in a city. All workers were interviewed with a questionnaire and had a clinical examination of the tenderness to palpation of epicondyles and epicondylar pain provoked by resisted extension and flexion of the wrist. RESULTS: Nursery school cooks had a significantly higher prevalence of epicondylitis (11.5%) than the controls (2.5%). In a logistic regression model, job title of the cook was also found to have a strong association with epicondylitis (odds ratio (OR) 5.4, 95% confidence interval (95% CI) 2.4 to 11.9) after adjustment for age, body length, and body mass index. Weaker associations were also found between epicondylitis and suspected job stress or workload scores for mechanical workload and psychosocial stressors based on factor analysis. CONCLUSIONS: This study supported the hypothesis that nursery school cooks had a higher prevalence of epicondylitis than other workers with less strenuous hand and arm tasks. It was suggested that risk factors of epicondylitis would be multifactorial, including mechanical workload and psychosocial factors.

Adult↗
PubMed2004

Relative validity of a food frequency questionnaire with a meat-cooking and heterocyclic amine module.

The nutrient and heterocyclic amine (HCA) intake of 165 healthy participants was assessed using a self-administered food frequency questionnaire (FFQ), which included a meat-cooking practices module. A database containing the HCA [2-amino-3,8-dimethylimadazo [4,5-f] quinoxaline (MeIQx) and 2-amino-1-methyl-6-phenylimadazo [4,5-b] pyridine (PhIP)] composition of various types of meat, cooked by different methods and to varying degrees, was developed and validated in conjunction with this module. The relative validity of dietary and HCA intake estimated by the FFQ was investigated using multiple food diaries (3 sets of 4 nonconsecutive day diaries completed over a 3-month period) as the reference method. Crude correlation coefficients of HCA intake assessed by the FFQ and food diaries were 0.43 [95% confidence interval (CI) 0.30-0.55] for MeIQx and 0.22 (95% CI 0.07-0.36) for PhIP intake. Deattenuated correlations were 0.60 (95% CI 0.49-0.69) and 0.36 (95% CI 0.22-0.49), respectively. Absolute MeIQx and PhIP intake was, however, underestimated by the FFQ (21.9 and 78.1 ng/day) compared with the food diaries (34.9 and 263.8 ng/day). The FFQ underestimated total red meat intake, the percentage of consumers, and the median intake of roast/baked and microwaved red meat. PhIP intake was severely underestimated by the FFQ and was most likely because of an underestimation of the percentage of people who cooked chicken using PhIP-producing cooking methods such as broiling and pan-frying. Additionally, the FFQ overestimated the percentage of consumers of baked chicken, a cooking method that produces less PhIP. In conclusion, although the FFQ and meat module underestimated absolute MeIQx and PhIP intake, its ability to rank individuals according to intake was acceptable.

Adult↗
PubMed1999

Effect of various domestic processing and cooking methods on phytic acid and HCl-extractability of calcium, phosphorus and iron of pigeon pea.

Manak, the high yielding cultivator of pigeon pea (Cajanus cajan) released by (International Crop Research Institute for Semi-Arid Tropics) ICRISAT, India was subjected to various domestic processing and cooking methods viz., soaking (6, 12 and 18 h, 30 degrees C), soaking and dehulling, ordinary cooking, pressure cooking and germination (24, 36 and 48 h, 30 degrees C). The unprocessed seeds of this variety contained considerable amounts of phytic acid i.e. 917 mg per 100 g. This antinutrient was reduced significantly (P < 0.05) to varying extents (4-37%) in the processed samples. Except soaking and dehulling, the remaining processing and cooking methods did not lower the contents of total calcium, phosphorus and iron. That HCl-extractability of these dietary essential minerals, an index of their bioavailability, enhanced significantly when the pigeon pea seeds were processed and cooked, may be due to reduction in phytate content, which is known to chelate the minerals. A significant and negative correlation between the phytic acid and HCl-extractability of minerals further strengthens our findings.

Analysis of Variance↗
PubMed1996

Sampling, cooking, and coring effects on Warner-Bratzler shear force values in beef.

A series of experiments was conducted to determine the effects of various factors on Warner-Bratzler shear force measurement of cooked beef. As the extent of thawing of frozen steaks before cooking for shear force evaluation increases (-2 vs 12 degrees C), shear force decreases (P < .05; 7.34 vs 5.99 kg). Location within the longissimus thoracis et lumborum from which steaks were obtained (caudal, medial, or cranial) did not affect (P > .05) shear force (5.21, 5.15, or 5.26 kg, respectively) or any sensory trait. Mean shear force of longissimus steaks cooked to either a constant temperature of 70 degrees C (6.97 kg) or for a constant time of 30 min (6.38 kg) was not different (P = .06), but shear force repeatability was higher for steaks cooked to constant temperature (.79 vs .53). Mean shear force (6.20 vs 6.33 kg) and shear force repeatability (.74 vs .68) of longissimus steaks cooked by either electric broiler or convection oven broiler, respectively, were not different (P > .05). Meat cores obtained perpendicular to the steak surface, from one location within the muscle, had lower (P < .05) mean shear force (3.41 vs 4.17 kg) and much less repeatable shear force (.12 vs .66) than cores obtained parallel to muscle fiber orientation. Use of more than five cores per animal did not significantly increase repeatability of mean shear force. Numerous factors must be carefully controlled to ensure measurement of shear force is as accurate and repeatable as possible.

Animals↗
PubMed2003

Mechanical measures of uncooked beef longissimus muscle can predict sensory panel tenderness and Warner-Bratzler shear force of cooked steaks.

Two experiments were conducted to investigate mechanical measures of tenderness on uncooked USDA Select longissimus muscle as a means to predict Warner-Bratzler shear force (WBSF) and trained sensory panel tenderness (SPT) of cooked steaks. In Exp. 1, strip loins (n = 24) were aged 14 d postmortem and fabricated into steaks (2.54 cm). Medial, center, and lateral locations within uncooked steaks were evaluated by a plumb bob device and correlated with WBSF and SPT of cooked steaks. In Exp. 2, 24 strip loins were used to evaluate how well plumb bob and needle probe devices used on uncooked steaks predicted WBSF and SPT of cooked steaks. At 2 d postmortem, two steaks were fabricated from the anterior end. One uncooked steak (2.54 cm) was assigned to the plumb bob treatment and the other uncooked steak (5.08 cm) was assigned to needle probe treatment. At 14 d postmortem, one uncooked steak (5.08 cm) was assigned to needle probe treatment, a second uncooked steak (2.54 cm) was assigned to plumb bob treatment, whereas the remaining steaks (2.54 cm) were cooked and evaluated by a trained sensory panel and WBSF device. In Exp. 1, average plumb bob values were negatively correlated (P < 0.05) to average SPT scores (r = -0.48). However, correlations between WBSF and plumb bob values for medial, lateral, and average of all sections were not significant (P > 0.05). In Exp. 2, regression models to predict SPT from needle probe and plumb bob measurements individually taken at 2 d postmortem had R2 of 0.54 and 0.51, respectively. Combining needle probe and plumb bob measurements resulted in an R2 of 0.76; when quadratic terms for both variables were in the model, the R2 was 0.80. Regressing needle probe and plumb bob measurements at 2 d postmortem with WBSF produced R2 values of 0.51 and 0.45, respectively. If linear terms of both probes were combined to predict WBSF, the R2 increased to 0.77. An equation to predict WBSF, including both the linear and quadratic terms of needle probe and plumb bob measurements, resulted in an R2 of 0.84. Using plumb bob and needle probe devices on uncooked longissimus muscle at 2 d postmortem can predict cooked WBSF and SPT of USDA Select Grade steaks at 14 d postmortem.

Aging↗
PubMed1989

Changes in fatty acid composition in sardines (Sardinops melanosticta) with cooking and refrigerated storage.

The influence of cooking and later storage in a refrigerator for 7 days on the fatty acid composition of lipids in sardines (Sardinops melanosticta) was studied. The total lipid and triacylglycerol (TG) levels did not change and the phospholipid (PL) level decreased somewhat with cooking or during storage. The fatty acid composition of the total lipids and TG fractions was little changed and that in the PL fractions was somewhat changed by the cooking. The composition of the polyunsaturated fatty acids (PUFA) in lipids of sardine precooked at 100 or 170 degrees C for 30 min changed from 42.7 to 38.3 or 33.5%, respectively, for total lipids and from 51.5 to 38.4 or 37.6%, respectively, for PL fractions during storage. The fatty acids in lipids from the ordinary meat of sardine was stable and those in the dark meat were extremely unstable during storage after cooking. We concluded that the PUFA in the lipids of sardines were stable to cooking, but unstable to oxidation during storage in a refrigerator. The PUFA of lipids in the dark meat of sardine were extremely unstable to oxidation.

Animals↗
PubMed1990

Cooking losses of thiamin in food and its nutritional significance.

To clarify the discrepancy between values of thiamin intake reported in national nutrition survey in Japan and judgment which was concluded by medical and biochemical examination in our field survey, thiamin of various daily foods were analyzed pre and post cooking in the various cooking methods, the following results were obtained. (1) The thiamin contents in cooked daily meals were 50-60 percent of the calculated values on an average. (2) The cooking losses of thiamin were particularly large in rice and green vegetables. (3) The loss of thiamin largest in boiling, followed by baking, parching and frying. (4) High temperature, pH, and chlorine on the public water accelerated thiamin losses. (5) The decrease of thiamin in cooked foods is caused by both of getting away of thiamin from foods and cleavage of thiamin of foods.

Chlorine↗
PubMed1998

Formation of heterocyclic amines in cooked chicken legs.

The effects of frying and microwave cooking on generation of heterocyclic amines (HAs) in chicken legs with skin and without skin were studied. Chicken legs were microwave-cooked at 2,450 MHz for 5, 10, and 15 min with an output power of 700 W. Frying of chicken legs was conducted at 100 and 150 degrees C for 15 min and at 200 degrees C for 5, 10, and 15 min. The various HAs were analyzed by HPLC with diode-array detection. Results showed that both the varieties and contents of HAs and the weight losses of chicken legs increased along with increasing cooking temperature and time. With skin both the amounts of HAs and weight losses of chicken legs were less than those without skin under the same heating conditions. The weight losses of microwave-cooked chicken legs were higher than those of fried chicken legs. The formation of the aminomethylimidazoquinoline type of HAs could be reduced by choosing microwave cooking in place of frying. Frying led to the formation of both the aminomethylimidazoquinoline and the carboline types of HAs.

Amines↗
PubMed2000

Factors influencing inactivation of Salmonella enteritidis in hard-cooked eggs.

The inside of a hen's egg, once considered sterile, is now known to occasionally harbor Salmonella Enteritidis. At least two recent outbreaks of salmonellosis in which Salmonella Enteritidis PT34 was involved have been associated with hard-cooked eggs. This study was undertaken to compare D56 degrees C values of Salmonella Senftenberg 775W and six strains of Salmonella Enteritidis isolated from outbreaks associated with eggs. D56 degrees C values for Salmonella Enteritidis in liquid egg yolk ranged from 5.14 to 7.39 min; the D56 degrees C value for Salmonella Senftenberg was 19.96 min. The two PT34 strains from outbreaks associated with hard-cooked eggs did not exhibit significantly higher resistance to heat compared with two PT4 strains and one strain each of PT8 and PT13a. A PT4 strain and a PT34 strain of Salmonella Enteritidis were separately inoculated (10(7) to 10(8) CFU) into the yolk of medium and extra large shell eggs at 10 and 21 degrees C, and survival was monitored using two cooking methods: (i) placing eggs in water at 23 degrees C, heating to 100 degrees C, removing from heat, and holding for 15 min (American Egg Board method) and (ii) placing eggs in water at 100 degrees C, then holding for 15 min at this temperature. Within the 15-min holding periods, inactivation was more rapid using the method recommended by the American Egg Board compared with method 2. Within each cooking method, inactivation was most rapid in medium eggs initially at 21 degrees C. The PT4 strain survived in yolk of extra large eggs initially at 10 degrees C when eggs were held in boiling water 9 min using method 2. The final temperature of the yolk in these eggs was 62.3 +/- 2 degrees C. Of the two methods evaluated for hard cooking eggs, the American Egg Board method is clearly most effective in killing Salmonella Enteritidis in the yolk.

Animals↗
PubMed1992

Oral, pharyngeal and laryngeal cancer as a cause of death among Swiss cooks.

In an analysis of Swiss mortality data (1979-1987) excess mortality due to oral, pharyngeal and laryngeal cancer was found among cooks, and the rate was very high in the age group < 55 years. The peak number of cases was observed among cooks in the age category 45-49 years. In the standard population the highest number of such deaths was observed between 65 and 69 years of age. The numbers of alcohol-related causes of death were also elevated among the cooks, while the numbers of smoking-related deaths were not. Although the dominant role of combined alcohol and tobacco consumption for the development of oral, pharyngeal and laryngeal cancer has been confirmed by many studies, other factors (eg, volatile carcinogenic compounds formed during the cooking process) may contribute to the excess mortality from oral, pharyngeal and laryngeal cancer among cooks. The question of the relevance of such factors will have to be answered by further studies.

Age Factors↗