GLOSSARY

Food Portion Photograph A food image showing reference quantities to help a person describe the amount consumed.

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.

A food record captures intake as it occurs or soon afterward and can include timing, amounts, preparation, drinks and supplements. Weighing can improve portion detail but increases burden, and recording itself can change eating. Estimated records depend on useful portion descriptions. Check leftovers, shared dishes, cooking fats and sports products without blaming the participant for uncertainty. Select representative days and explain whether quantities are raw, cooked or edible portions so that later nutrient calculations correspond to what was actually consumed.

Food composition analysis depends on matching the reported food to an appropriate database entry. Variety, brand, fortification, preparation and raw-versus-cooked weight can change the match. Missing data do not necessarily mean that a nutrient is absent. Recipes require ingredient amounts, edible yields and suitable retention assumptions. Record the database and version when comparability matters. A detailed software output remains an estimate; checking the food match and units can be more valuable than reporting many decimal places from uncertain intake data.

For example, two household bowls can hold very different amounts of cereal. Clarify the container, preparation and actual portion using a suitable aid. Distinguish this estimate from the manufacturer's serving and retain the uncertainty when calculating carbohydrate for the athlete's reported meal.

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.

Food-label reference values support product comparison within the applicable labeling system. A percentage refers to a stated amount of food and a reference value; it is not a measurement of the eater's personal requirement. Check serving size, servings consumed and whether the panel is per serving or per mass. Label rules and permitted claims differ between jurisdictions. An athlete may need more carbohydrate or energy than the generic reference, while a large micronutrient percentage does not automatically improve performance or justify additional supplements.

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.