Adherence

A Food Frequency Questionnaire (FFQ) provides a valid estimate of total energy intake relative to doubly-labeled water measurements in free-living populations, whereas 24-hour recalls are prone to significant underreporting, particularly in women and heavy alcohol consumers.

If you are tracking your diet to manage weight, be aware that 24-hour recalls often underestimate how much you eat, especially if you drink alcohol or are a woman. A Food Frequency Questionnaire (FFQ) may provide a more accurate picture of your total energy intake relative to your actual energy expenditure. Do not rely solely on daily food logs if you suspect you are underreporting.