USDA National Nutrient Database Standard Reference Release28

The USDA National Nutrient Database for Standard Reference (SR) is the most comprehensive, publiclyavailable source of nutrient data for foods consumed in the United States. Release28, published in 2015, is the latest major update and contains more than 8,800 food items with detailed information on over 150 nutrients and food components.

Why the Database Matters

Researchers, dietitians, food manufacturers, and policy makers rely on the USDA database to:

• Develop dietary guidelines and nutrition policies.
• Formulate and label packaged foods.
• Conduct epidemiological studies linking diet to health outcomes.
• Build nutrition education tools for the public.
• Support academic coursework in nutrition science.

Key Features of Release28

Expanded Food List

Release28 adds more than 1,000 new items, including a wider variety of ethnic foods, newer processed products, and revised entries for items that have undergone formulation changes. Examples include:

• Quinoa (dry, raw and cooked)
• Greek yogurt (lowfat, fruitflavored)
• Plantbased meat alternatives
• Specialty grains such as amaranth and teff

Improved Analytical Data

Data were collected from updated laboratory analyses, USDAs Food Composition Research Laboratory, and peerreviewed literature. The precision of macro and micronutrient values has been increased, especially for:

• Vitamin D (including D2 and D3 forms)
• Omega3 fatty acids (EPA, DHA)
• Added sugars
• Phytochemicals such as flavonoids and carotenoids

Standardized Naming and Coding

Each food item receives a unique 8digit USDA Food Code, making it easy to crossreference data across software platforms. The naming convention follows the Food Group Subgroup Specific Item hierarchy, ensuring consistency when searching for similar products.

How to Access the Data

The complete dataset is available for free download in several formats:

Understanding the Nutrient Columns

Each row in the database represents a specific food item. The columns include, but are not limited to:

• Energy (kcal) total caloric value.
• Protein (g) total nitrogenbased protein content.
• Total lipid (fat) (g) sum of all fatty acids and related compounds.
• Carbohydrate, by difference (g) total carbs, including fiber and sugars.
• Fiber, total dietary (g)
• Sugars, total including added (g)
• Calcium, Magnesium, Potassium, Sodium (mg)
• Vitamin A, Vitamin C, Vitamin D (g)
• Iron, Zinc, Selenium (g)
• Fatty acids Saturated, Monounsaturated, Polyunsaturated (g)
• Cholesterol (mg)
• Water (g)

Limitations and Considerations

While Release28 is one of the most robust resources available, users should keep the following points in mind:

• Sample variability: Nutrient values reflect averages of multiple samples; actual food composition may vary by brand, harvest, or preparation method.
• Missing data: Some newer food items may still lack complete micronutrient profiles.
• Cooking factors: The database provides raw, boiled, fried, and other preparation formats, but does not fully account for nutrient loss or gain due to specific cooking conditions.

Practical Applications

Dietary assessment tools such as MyPlate, Nutritionix, and the ASA24 recall system all draw from SR Release28. Nutrition professionals use the data to design meal plans that meet calorie and nutrient targets for athletes, patients with chronic disease, and the general population.

Food industry formulation benefits from the detailed breakdown of macronutrients and specific fatty acids, enabling manufacturers to create products that meet label claims for lowfat, highprotein, or source of omega3.

Research on dietdisease relationships frequently cites the USDA database because it is transparent, regularly updated, and freely available. Large cohort studies (e.g., NHANES, the Nurses Health Study) match participants reported food intake with SR values to estimate nutrient exposure.

Getting Started Quickly

For newcomers, a simple threestep workflow can help you begin using the database:

1. Identify the food code: Use the online search tool on the USDA FoodData Central website to find the exact code for the item you need.
2. Download the relevant file: Choose CSV for quick spreadsheet analysis or API for programmatic access.
3. Extract the nutrients you need: Filter columns for energy, macronutrients, and any micronutrients of interest, then perform calculations (e.g., daily % values) using a spreadsheet or statistical software.

Future Directions

Release28 set the stage for ongoing improvements. Anticipated updates include:

• More comprehensive data on food additives and contaminants.
• Expansion of branded food entries in partnership with manufacturers.
• Integration of metabolomics data for a deeper picture of bioactive compounds.

For the latest news and upcoming releases, visit the USDA Agricultural Research Service (ARS) website.