Some time ago I read in a sport paper (probably Volek JS, but I do not remember) which said that women habitually under-reported when answer different dietary records.
I work with female athletes and always when I calculate their nutritional intake, with 7- days records or validated food frequency questionnaire, see low energy intake and macronutrients, specially carbohydrates.
I think a possible justification, they do not write every food which eat.
Dear Juan,
I suggest you this very nice and complete reference about underreporting from Livingstone and Black: http://www.ncbi.nlm.nih.gov/pubmed/12612176
I also suggest another reference about undereporting of habitual food intake which can be divided into underrecording ("lying" about what you eat, but also having problem in accurately estimate your food intakes) and undereating (modifying your behaviour during the time of the survey): http://www.ncbi.nlm.nih.gov/pubmed/10203564
Dear Juan.
Why do you suppose that exist a reference about women usually lie when answer a dietary questionnaire?. Why do you suppose that only women lie?
I think it is very important a personal interview with the patient in order to detect possible oversights.
Everyone underreports, even when we know we are being watched: http://www.ncbi.nlm.nih.gov/pubmed/24635904
Thank you Eric and Javier for your links.
José Manuel, I only say a information that I read in the past in a sport publication (possible by Volek).
However I work in clinic nutrition and I show that women have different perception about their food intake than men. I do not know if they lie or is only a different perception.
You are not alone! In our experience, is very commonly found diets low in carbs and low in calories. But very high in proteins. In women and men with R-24h.
https://www.researchgate.net/publication/237026012_Evaluacin_del_estado_nutricional_en_la_deteccin_de_factores_de_riesgo_cardiovascular_en_una_poblacin_adulta
https://www.researchgate.net/publication/256292954_ndice_glicmico_y_carga_glucmica_de_las_dietas_de_adultos_diabticos_y_no_diabticos
Culturally, in our population the carbs are bad, more if the person have diabetes. So, we need more investigation in this topic.
Regards from Venezuela!
Article Evaluación del estado nutricional en la detección de factore...
Article Índice glicémico y carga glucémica de las dietas de adultos ...
Hi Juan - lying suggests deliberate deception - both sexes can miss-report food intake (or any health behaviour) for reasons including not knowing or not remembering, cognitive understanding of questionnaire/diary, and social desirability (which can be influenced by the researcher and the survey design).
The extent of these reporting biases/errors could of course be stratified by age, sex, or other variables.
Men, women, and children ALL underreport. As Paul suggests, under reporting does not equate to lying. Misunderstanding of portion sizes or underestimation can contribute to this. There are many references for this. Renni et al reported on the very high rates of this phenomenon in the British Journal of Nutrition in 2007. Additional evidence for this in the US comes from national estimates of intake of adults based on report which document averagee intakes something like 20% less than average estimated needs based on doubly labeled water methods. However, it is generally true that women under report a bit more than men. Obese individuals also underreport to a greater extent.
Thank you everybody for your answers. I do not want to create polemic. I only searched a reference that why in female sports do not adjust the energy intake vs. energy expenditure.I needed justification a data from a research and remembering I remembered a reference in one of Volek papers.
Thank you again for your answers.
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