Glossary

Terms we use in our testing protocol and reviews. Each entry is self-contained.

• 24-Hour Dietary Recall (24-HR)

  A 24-Hour Dietary Recall (24-HR) is a method for assessing an individual's food and beverage intake over the previous 24 hours.

• Adaptive TDEE Estimation

  Adaptive TDEE estimation is a dynamic method for calculating Total Daily Energy Expenditure based on individual metabolic changes and activity levels.

• AggregateRating Schema.org Markup

  AggregateRating Schema.org markup is a structured data format that summarizes user ratings for a product or service.

• Barcode Scanning (Calorie App)

  Barcode scanning is a feature in calorie-tracking apps that allows users to quickly input food items by scanning their barcodes.

• Basal Metabolic Rate (BMR)

  Basal Metabolic Rate (BMR) is the number of calories the body requires at rest to maintain basic physiological functions.

• Body Recomposition (Recomp)

  Body recomposition is the process of simultaneously losing fat and gaining muscle, resulting in a change in body composition without significant weight loss.

• Caloric Deficit

  A caloric deficit occurs when the number of calories consumed is less than the number of calories expended by the body.

• Caloric Surplus

  A caloric surplus occurs when the number of calories consumed exceeds the number of calories expended by the body.

• Continuous Glucose Monitor (CGM)

  A Continuous Glucose Monitor (CGM) is a device that tracks glucose levels in real-time through a sensor placed under the skin.

• Crowdsourced Food Database

  A crowdsourced food database is a collection of food items and their nutritional information contributed by users and verified by the community.

• Cut Phase

  A cut phase is a period in a fitness regimen focused on fat loss while preserving lean muscle mass through caloric deficit and increased physical activity.

• Dietary Assessment

  Dietary assessment is the systematic evaluation of food and nutrient intake to determine dietary patterns and nutritional status.

• Dietary Fiber Tracking

  Dietary fiber tracking involves monitoring the intake of dietary fiber, a type of carbohydrate that the body cannot digest.

• Energy Balance

  Energy balance refers to the relationship between calories consumed through food and beverages and calories expended through physical activity and metabolism.

• Evidence Grade (A–F)

  Evidence Grade (A–F) is a classification system that evaluates the quality of scientific evidence supporting nutritional claims or dietary guidelines.

• Food Frequency Questionnaire (FFQ)

  A Food Frequency Questionnaire (FFQ) is a dietary assessment tool used to evaluate an individual's food intake over a specified period.

• GLP-1 Agonist Medication (GLP-1)

  GLP-1 Agonist Medication is a class of drugs that mimic the action of glucagon-like peptide-1 to regulate blood sugar and appetite.

• Glycemic Index (GI)

  The Glycemic Index (GI) measures how quickly carbohydrate-containing food raises blood glucose levels.

• Glycemic Load (GL)

  Glycemic Load (GL) quantifies the impact of carbohydrate-containing food on blood sugar levels, factoring in both the quality and quantity of carbohydrates.

• Macronutrient

  Macronutrients are the nutrients required in large amounts for energy and bodily functions, including carbohydrates, proteins, and fats.

• Maintenance Phase (Calorie Tracking)

  The Maintenance Phase in calorie tracking refers to the period where caloric intake is adjusted to maintain current body weight after achieving weight loss or gain goals.

• Meal Recall Bias

  Meal recall bias is the systematic error that occurs when individuals inaccurately remember or report their dietary intake.

• Mean Absolute Percentage Error (MAPE)

  Mean Absolute Percentage Error (MAPE) is a measure used to assess the accuracy of a forecasting method by calculating the average absolute percentage error between predicted and actual values.

• MedicalWebPage Schema.org Markup

  MedicalWebPage Schema.org markup is a structured data format that helps search engines understand medical content on web pages.

• Micronutrient

  Micronutrients are essential vitamins and minerals required by the body in small amounts for proper physiological function.

• Net Carbohydrates (Net Carbs)

  Net carbohydrates are the total carbohydrates in a food minus its fiber and certain sugar alcohols, which are not fully absorbed by the body.

• Nutrition Coordinating Center Database (NCCDB)

  The Nutrition Coordinating Center Database (NCCDB) is a comprehensive food and nutrient database used for dietary assessment and research.

• Nutritional Ketosis

  Nutritional ketosis is a metabolic state characterized by elevated levels of ketones in the blood due to a high-fat, low-carbohydrate diet.

• Open Food Facts

  Open Food Facts is a collaborative database of food products from around the world, providing detailed nutritional information and ingredient lists.

• Photo-AI Calorie Tracking

  Photo-AI calorie tracking utilizes artificial intelligence to analyze food images and estimate their caloric content for dietary monitoring.

• Plate Segmentation in Photo-AI

  Plate segmentation in photo-AI refers to the process of identifying and categorizing food items on a plate using artificial intelligence technology.

• Protein Leverage Hypothesis

  The Protein Leverage Hypothesis posits that the proportion of protein in the diet influences overall energy intake and body weight regulation.

• RD-Verified Food Database

  An RD-Verified Food Database is a collection of food items that have been evaluated and approved by registered dietitians for nutritional accuracy.

• Root Mean Square Error (RMSE)

  Root Mean Square Error (RMSE) is a statistical measure that quantifies the differences between predicted and observed values in a dataset.

• Thermic Effect of Food (TEF)

  The Thermic Effect of Food (TEF) refers to the energy expended by the body to digest, absorb, and metabolize nutrients from food.

• Total Daily Energy Expenditure (TDEE)

  Total Daily Energy Expenditure (TDEE) is the total number of calories burned by an individual in a day, including all activities and bodily functions.

• Tracker Benchmark Index (TBI Score)

  The Tracker Benchmark Index (TBI Score) is a composite score evaluating the performance of calorie-tracking apps based on multiple criteria.

• Underreporting Bias

  Underreporting bias refers to the systematic tendency of individuals to underestimate their food intake, leading to inaccurate dietary assessments.

• USDA FoodData Central (FDC)

  The U.S. Department of Agriculture's integrated food composition database, used by researchers and consumer apps as a primary nutrient data source.

• USDA FoodData Central (FDC)

  USDA FoodData Central is a comprehensive database of food and nutrient information maintained by the United States Department of Agriculture.

• Weighed Reference Meal

  A weighed reference meal is a standardized meal portion used to assess and calibrate food intake measurements in dietary studies.

• Weighed Reference Meals

  Meals whose ingredient masses are measured on a calibrated kitchen scale, with calorie content computed from USDA FoodData Central composition values, used as ground truth for app accuracy testing.