Sentences with phrase «of food frequency questionnaires»

(2) As Chris Masterjohn has pointed out, the data consisted of food frequency questionnaires given to health professionals, and most respondents understated their red meat consumption.

The men's diet was assessed by means of a food frequency questionnaire, and they were asked how often, on average, they had consumed how many portions of fruit and vegetables, using standard portion sizes such as one apple, or half an avocado.

Validation of a Food Frequency Questionnaire for Vitamin D and Calcium Intake in Healthy Female College Students

Slightly more than one fifth of the adolescent mothers (22 %) reported that they had breastfed their infants at least once, and 13 % were breastfeeding at the time of the food frequency questionnaire, in combination with formula feeding.

Not exact matches

Adherence was monitored with the use of food - frequency questionnaires during the study and was corroborated at the end of the study through the measurement of peanut in bed dust, an objective and previously validated surrogate for consumption.23, 24

In a linked editorial, Dr Kathryn Fitzgerald of John Hopkins School of Medicine, Baltimore, emphasises the caveats for an observational study of this kind which relies on food frequency questionnaires that are not fully able to describe different types of fat.

Women were sorted into four quartile groups based on the amount of isoflavone they were estimated to have consumed, calculated from self - reported food frequency questionnaires.

All participants first completed a detailed food - frequency questionnaire along with a questionnaire regarding lifestyle and background factors (alcohol, smoking, physical activity, and years of education) as well as a brief physical examination including measurement of waist circumference.

At the start of CARDIA (1985 - 1986), women and men were asked about their consumption of different fruits and vegetables and the number of servings they had eaten in the past month using a semi-quantitative interview food - frequency questionnaire.

The PHS II includes more than 14,000 US male physicians over 50 years of age who have completed comprehensive food frequency questionnaires.

Both studies used detailed food - frequency questionnaires administered every four years to evaluate the composition of the participants» diets.

All of the participants, which were patients of the University of Michigan Head and Neck Specialized Program of Research Excellence, were asked to track their intake of food, beverages and supplements for a year prior to diagnosis and a year following treatment using the Harvard Food Frequency Questionnafood, beverages and supplements for a year prior to diagnosis and a year following treatment using the Harvard Food Frequency QuestionnaFood Frequency Questionnaire.

Dr. Arun Swaminath explained that the study's data on omega - 3 intake came from «food frequency questionnaires,» and these types of studies «have significant weaknesses to the point that some have questioned whether they should be abandoned altogether.»

In the questionnaire they were asked about consumption frequency and size of portions for 122 food groups and goods throughout a period of 3 months which included questions regarding fat intake from cooking, meat, dairy and reduced fat foods.

Questionnaires for food frequency were made use of every 4 years for assessing the habitual diet of individuals, asking how often, on average, each food was consumed in a standard portion size.

Every one of them was free from cancer and cardiovascular disease at beginning of the study, when they completed the food frequency questionnaire used in the research.

Dietary data was collected by means of a food - frequency questionnaire.

In all the studies, dietary magnesium levels were established making use of a 24 - hour dietary recall or a food frequency questionnaire.

Study participants received a questionnaire on food frequency at the time of enrollment and again 3 years later to evaluate their diet.

General Mills provided funding for coding of the food - frequency questionnaire completed by study participants.

Validity of carbohydrate, glycaemic index and glycaemic load data obtained using a semi-quantitative food - frequency questionnaire

One cited study, which attributes stroke to excessive salt intake, is a meta - analysis of thirteen studies published between 1966 and 2008 in which most measurements of sodium intake were highly inaccurate estimates based on food frequency questionnaires.22 The second is a review of fifty - two studies, which concluded that strokes are not caused by excess sodium but rather by insufficient potassium, a finding that is consistent with the preponderance of evidence.23 Cordain ignores more recent large clinical and epidemiological studies, which have found that sodium intakes of less than 3 grams per day significantly increase cardiovascular risk.3, 4

Estimates of nutrient intake from a food frequency questionnaire: the 1987 National Health Interview Survey

Differences between food group reports of low - energy reporters and non-low-energy reporters on a food frequency questionnaire.

Almost all of these epidemiological studies rely on food frequency questionnaires that ask respondents to remember what they ate weeks, months, and in some cases, YEARS ago.

Bedard D, Shatenstein B, Nadon S. Underreporting of energy intake from a self - administered food - frequency questionnaire completed by adults in Montreal.

Researchers followed a sample of 6,712 girls between the ages of 9 and 15 over a period of seven years, annually assessing their dairy, calcium and vitamin D intakes via a food frequency questionnaire.

They were also asked to complete a 120 - item food - frequency questionnaire to assess dietary change from the beginning to the end of the study.

In a subgroup of 1953 study participants who also completed a 24 - hour dietary - recall questionnaire on 2 nonconsecutive days, 33 the Spearman coefficient for the correlation between coffee consumption as assessed with this questionnaire and coffee consumption as assessed with the baseline food - frequency questionnaire was 0.80.

The questionnaire asked about their current weekly frequency of consumption of 43 food groups and food items.

Design: Intakes of vitamin D and calcium from foods and supplements were measured every 4 y with the use of a food - frequency questionnaire.

The Memory and Aging Project recruited 960 volunteers, ages 58 - 99, who completed a food frequency questionnaire and had at least two cognitive assessments over the course of four years and seven months.

Although the Lim team found no relationship between dietary intake of preformed retinol and fracture risk, it only used one one - week food frequency questionnaire (FFQ), 13 whereas the 1998 Melhus study used four one - week FFQs, 7 and the Nurses» Health Study used five one - week FFQs.

Food groups were formed based on a semiquantitative food frequency questionnaire (12); for example, the whole - grain group was formed as the sum of the number of servings per week of dark bread, brown rice, whole - grain breakfast cereal, bran, wheat germ, and a miscellaneous whole - grain item (Food groups were formed based on a semiquantitative food frequency questionnaire (12); for example, the whole - grain group was formed as the sum of the number of servings per week of dark bread, brown rice, whole - grain breakfast cereal, bran, wheat germ, and a miscellaneous whole - grain item (food frequency questionnaire (12); for example, the whole - grain group was formed as the sum of the number of servings per week of dark bread, brown rice, whole - grain breakfast cereal, bran, wheat germ, and a miscellaneous whole - grain item (13).

Finally, according to the authors, «[T] he validation of the [food frequency questionnaire] showed that protein intake was particularly difficult to estimate.»

Third, the researchers assessed the intake of artificial sweeteners using food frequency questionnaires (FFQ).

Despite the measurement of key confounders in our analyses, the potential for residual confounding can not be ruled out, and although our food frequency questionnaire specified portion size, the assessment of diet using any method will have measurement error.

Differences between Food Group Reports of Low - Energy Reporters and Non — Low - Energy Reporters on a Food Frequency Questionnaire.

Stratified analyses were also conducted by methodologic quality, sex, type of dietary assessment tool (food frequency questionnaires vs food records and 24 - hour recall), continental region (North America, Europe, and Asia), and type of prevention strategy (primary vs secondary) to assess the influence of these factors on the observed associations between diet and CHD.

Abbreviations: BMI, body mass index; FFQ, food frequency questionnaire; GI, glycemic index; GL, glycemic load; HPFS, Health Professionals Follow - up Study; NHS, Nurses» Health Study; NHS II, Nurses» Health Study II; USDA, United States Department of Agriculture

The team used a validated food frequency questionnaire to determine consumption of fish, vegetables, fruit, alcohol - containing beverages, dairy products, and meat.

Participants were asked to report the hours spent per week on moderate (eg, brisk walking) and vigorous (eg, strenuous sports and jogging) exercise, then the total hours of metabolic equivalent tasks per week were estimated on the basis of the metabolic equivalent task score assigned to each activity.15 Dietary variables were assessed using a validated semiquantitative food frequency questionnaire.12 Mental health was assessed using the 36 - Item Short - Form Health Survey in the 1996 questionnaire.

The researchers, from the Dutch National Institute of Public Health and the Environment, Utrecht University, University Medical Center Groningen, used food frequency questionnaires completed by the parents of 598 Dutch children aged 8 - 13 years.

Development of a glycemic index database for food frequency questionnaires used in epidemiologic studies

Dietary validation studies have indicated that the frequency of coffee consumption reported on a food frequency questionnaire is highly reproducible and agrees well with assessments using diet records (15).

In a validation study in the original Nurses» Health Study, we found high correlations between intake of coffee and other caffeinated beverages assessed with food frequency questionnaire and with four 1 - week diet records (coffee, r = 0.78; tea, r = 0.93; and caffeinated sodas, r = 0.85)(15).

At 3 months, a subset of 121 adolescent mothers reported on their infant's intake through a food frequency questionnaire.

When infants were 3 months of age, we conducted a food frequency questionnaire to test the hypothesis that the adolescent mothers in the intervention group would be more likely to adhere to feeding guidelines of limiting their infants» intake to breast milk, formula, or water for the first 4 to 6 months of life, compared with mothers in the control group.

Reproducibility and validity of an expanded self - administered semiquantitative food frequency questionnaire among male health professionals

Dietary data were collected from the Food Frequency Questionnaire (FFQ), a valid and reliable measure of estimated food and beverage consumption (Rogers and Emmett 1998); The FFQ was used to assess (a) mother's reported dietary patterns at 32 weeks gestation («pregnancy»), and (b) what the mother reported feeding her child at 38 months of age («3 years&raquFood Frequency Questionnaire (FFQ), a valid and reliable measure of estimated food and beverage consumption (Rogers and Emmett 1998); The FFQ was used to assess (a) mother's reported dietary patterns at 32 weeks gestation («pregnancy»), and (b) what the mother reported feeding her child at 38 months of age («3 years&raqufood and beverage consumption (Rogers and Emmett 1998); The FFQ was used to assess (a) mother's reported dietary patterns at 32 weeks gestation («pregnancy»), and (b) what the mother reported feeding her child at 38 months of age («3 years»).