GLOSSARY

Dietary Screener A brief tool focused on selected foods, nutrients or dietary behaviors rather than a complete intake assessment.

A food frequency questionnaire asks how often specified foods were consumed over a defined period. Quantitative and semi-quantitative versions add different forms of portion information. A questionnaire must suit the foods, language and population being studied; a list missing local staples or sports products can create systematic error. These tools can rank patterns or habitual exposure but are less suited to precise timing or single-day intake. A short screener answers a narrower question and should not be treated as a complete dietary assessment.

Usual intake describes a longer-term average rather than the intake of one isolated day. Day-to-day variation includes real differences between training, rest and competition days as well as measurement noise. Repeated observations should cover relevant conditions and be collected with a suitable method. Averaging a few unusual days can still give a misleading estimate. For the athlete, preserve useful information about distribution and timing: an acceptable weekly energy average can coexist with repeated underfueling around demanding sessions.

Choose a dietary assessment method according to the question, population and resources. A recent intake record can explore meal timing around training; a frequency questionnaire can describe longer-term patterns. Neither automatically establishes exact habitual intake. Combine food details with training, access, symptoms, medication and relevant measurements. Explain uncertainties and what the method cannot answer. Good assessment produces a decision that can be reviewed, rather than an impressive nutrient report whose apparent precision exceeds the quality of the information collected.

Accuracy concerns closeness to an appropriate reference, while precision concerns repeatability; consistent measurements can still be systematically wrong. Validity asks whether a method supports its intended interpretation, and reliability asks how consistently it performs. Reporting error can reflect memory, burden, food omission or social pressure. An implausible estimate should prompt review rather than an accusation. Calibration may reduce specific errors under defined assumptions, but it does not turn every self-report into an exact measurement of an athlete's habitual intake.

Portion assessment translates what a person reports into a usable quantity. Household measures, photographs, food models and scales offer different types of help; none eliminates uncertainty. Distinguish an individual's actual portion from a standardized serving used for analysis or labeling. Check density, container size, edible fraction and whether a photograph depicts the same food form. In an athlete's plan, practical examples should make adequate intake easier while allowing the assessor to explain how the reported amount was estimated and where uncertainty remains.

Food practices reflect culture, family, religion, identity and personal preference as well as nutrient composition. Ask what the person actually eats and values rather than assigning a stereotyped pattern. Adapt food examples, preparation methods and meal timing while preserving nutritional adequacy and relevant safety requirements. Cultural restrictions may require suitable replacements, but unfamiliar foods are not inherently inferior. In team travel and clinical care, discuss acceptable options directly so that a well-intended prescription does not leave the person without enough food they can use.