How We Create Our Content

At CalorieData, our goal is simple: give people accurate, easy-to-understand nutrition information they can actually use. Millions of people search every month for how many calories are in a food, how much protein it contains, or whether one food is a better choice than another. The answers are scattered across dense government databases, paywalled tools, and unreliable blog posts. We exist to translate authoritative nutrition data into clear, practical pages that anyone can understand — without a login, a subscription, or a spreadsheet.

This page explains exactly how we do that: where our numbers come from, how we turn raw data into readable pages, who writes and reviews the content, and how we correct mistakes. We believe you should be able to trust nutrition information, which means you should be able to see how it was made.

Where Our Data Comes From

The core nutrition values on CalorieData — calories, protein, carbohydrates, fat, fiber, sugar, sodium, and key vitamins and minerals — come from the USDA FoodData Central database, the official food composition resource maintained by the U.S. Department of Agriculture (USDA) Agricultural Research Service. It is the most authoritative, openly available source of food composition data in the United States, and it is the reference that registered dietitians, researchers, and government agencies rely on.

Every food page on our site is tied to a specific USDA record. Each record in FoodData Central has a unique identifier called an fdcId, and we store that identifier alongside the food in our database. This lets us trace any number we publish back to its exact source record, re-verify it whenever the USDA updates its data, and avoid mixing values from different foods or preparation methods. Where a food has multiple USDA entries (for example, raw versus cooked, or different cuts and brands), we select the entry that best represents the common, generic form of the food and note the basis we used.

Unless stated otherwise, the nutrition values we display are normalized to a 100-gram serving. Using a consistent 100g basis is what makes fair comparisons between foods possible, and it matches the convention used by FoodData Central itself. On individual food pages we also translate these values into common, real-world serving sizes (a cup, a piece, a typical portion) so the numbers are useful in everyday life.

Our Research & Writing Methodology

Producing a food page is more than copying a row of numbers. For each food we follow a consistent process:

1. Source selection. We identify the most representative USDA FoodData Central record for the food and record its fdcId, data type, and the serving basis we are using.
2. Data normalization. We convert the USDA values to a standard 100g basis and to common serving sizes, and we run automated checks for obvious anomalies (for example, macronutrient calories that do not reconcile with the listed total calories within a reasonable tolerance).
3. Context and explanation. We add plain-language context that the raw data does not provide — what the food is good for, how it fits into common diets, how it compares to similar foods, and answers to the questions people actually ask. This editorial layer is original writing, not auto-generated filler.
4. Supporting guidance. Our guides, diet pages, and calculators are written to reflect mainstream, evidence-based nutrition principles (such as those reflected in the Dietary Guidelines for Americans and established dietetic practice), and we link them to the underlying food data so readers can dig deeper.

For a deeper technical explanation of how we calculate and present values, see our Data Methodology page.

Editorial Standards

We hold our content to standards designed to keep it accurate, useful, and honest:

• Accuracy first. Numbers are sourced from USDA FoodData Central and tied to a verifiable record. We do not invent or estimate nutrition values to fill gaps.
• Clarity over jargon. We write for a general audience and explain technical terms when we use them. Our nutrition glossary defines common terminology.
• No medical advice. Our content is educational. It is not a substitute for personalized advice from a doctor or registered dietitian, and we say so clearly. See our health disclaimer.
• Independence and transparency. Our editorial content is not influenced by advertisers. Where a page contains an affiliate link or sponsored placement, we keep it limited and clearly distinct from the nutrition information. Advertising never changes the data we report.
• Consistency. All food pages use the same data basis, the same nutrient definitions, and the same sourcing, so comparisons across the site are fair.

For the full policy, read our Editorial Guidelines.

Review & Fact-Checking

Quantitative nutrition data is verified against its source USDA record before it is published, and our automated validation flags values that fall outside expected ranges for review. Editorial guidance — the explanatory writing on our guides, diet pages, and food pages — is reviewed for alignment with mainstream, evidence-based nutrition science. Where appropriate, content is reviewed with input from qualified nutrition professionals, and pages note when they have been reviewed.

Updates & Corrections Policy

Nutrition science and food composition databases change over time. USDA FoodData Central is periodically updated with new and revised records, and we re-check our data against it on an ongoing basis. Because each food is linked to its fdcId, we can re-pull and refresh values efficiently when the source record changes.

If you spot a number that looks wrong or content that is out of date, we want to know. Please reach out through our contact page with the food name and the issue. We review every correction request against the source data, fix verified errors promptly, and update the page’s “last reviewed” date when we make a substantive change. We would rather correct a mistake quickly than leave inaccurate information online.

Who Is Behind Our Content

CalorieData is produced by an independent team focused on nutrition data and consumer health education. Our work combines data and engineering — sourcing, validating, and structuring USDA data at scale — with editorial writing that turns that data into something readable and genuinely helpful. You can learn more about our team, our mission, and our approach on the pages below.

• About CalorieData — our mission and story
• Our Team — the people who create and review our content
• Editorial Guidelines — the standards we hold ourselves to
• Data Methodology — how we calculate and present values