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Old Sat, Jul-27-02, 00:36
Voyajer's Avatar
Voyajer Voyajer is offline
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Plan: Protein Power LP Dilletan
Stats: 164/145/138 Female 5'7"
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Progress: 73%
Default The Gold Standard--The more fat you eat the lower your triglycerides

This amazes me. How do they tell if people are lying on their food intake on the study questionaires? Well, they do a blood test on their triglycerides. If their triglycerides are low, then they are eating a lot of fat.

American Journal of Epidemiology Vol. 154, No. 12 : 1107-1112
2001 by The Johns Hopkins University School of Hygiene and Public Health

--------------------------------------------------------------------------------

NUTRITIONAL EPIDEMIOLOGY

Assessment of Questionnaire Validity for Measuring Total Fat Intake using Plasma Lipid Levels as Criteria
Walter Willett1,2,3, Meir Stampfer1,2,3, Nain-Feng Chu3, Donna Spiegelman3,4, Michelle Holmes2 and Eric Rimm1,2,3
1 Department of Nutrition, Harvard School of Public Health, Boston, MA.
2 Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA.
3 Department of Epidemiology, Harvard School of Public Health, Boston, MA.
4 Department of Biostatistics, Harvard School of Public Health, Boston, MA.

ABSTRACT

The validation of dietary total fat measurements has been elusive because no specific biomarker exists. In metabolic studies with controlled diets, plasma fasting triglyceride levels are reduced with higher fat intake and can thus serve as an "alloyed gold" standard. Participants in this cross-sectional analysis were 269 men aged 47–83 years from the Health Professionals Follow-up Study who completed a semiquantitative food frequency questionnaire and provided fasting blood specimens in 1994. In a multiple regression analysis adjusted for age; smoking; alcohol consumption; physical activity; body mass index; and intakes of protein, dietary fiber, and total energy, total fat intake was inversely associated with fasting triglycerides (for a fat increase of 1% of energy, triglyceride levels were lower by 2.5% (95% confidence interval: -3.7 to -1.3%, p = 0.0002)). For reported fat intakes of 20% or less of energy, the geometric mean fasting triglyceride level was 179, and for more than 40% of energy, it was 102 mg/dl. In addition, as predicted by metabolic studies, the inverse association between dietary fat and fasting triglyceride level was much stronger among overweight men than among men with a BMI of less than 25. These data provide additional evidence that informative measurements of dietary fat can be obtained by carefully constructed food frequency questionnaires.
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