Our Sources & How We Verify
Every number on this site ties back to a trusted source. Food safety is not a guessing game, and we treat it accordingly. Here is exactly where our data comes from and how we keep it accurate.
Food Storage Times
Our storage data comes from the USDA FoodKeeper database, maintained by the United States Department of Agriculture's Food Safety and Inspection Service (FSIS). FoodKeeper is the same database that powers the official FoodKeeper mobile app.
We cross-reference with guidelines from the FDA (U.S. Food & Drug Administration) and foodsafety.gov, the federal government's food safety gateway.
For each of our 153 food storage pages, we include the recommended fridge, freezer, and pantry timeframes directly from these sources.
Primary source: USDA FoodKeeper Database
Freezing Guides
Our freezing guides combine USDA FoodKeeper freezer storage data with food science research on how freezing affects texture, flavor, and safety. Freezing instructions (blanching times, packaging methods, thawing procedures) are drawn from USDA guidelines and university extension programs including Penn State Extension, the University of Minnesota Extension, and the National Center for Home Food Preservation.
Primary source: National Center for Home Food Preservation
Cooking Times & Safe Temperatures
All safe minimum internal temperatures come from the USDA Safe Minimum Internal Temperature Chart, published by FSIS. These are the temperatures required to kill harmful bacteria like Salmonella and E. coli.
Cooking time ranges for specific methods (oven, air fryer, grill, stovetop, slow cooker, Instant Pot) are compiled from USDA guidelines and cross-checked against manufacturer recommendations and established culinary references.
Primary source: USDA Safe Minimum Internal Temperatures
Reheating Guides
Our reheating methods and temperatures follow USDA leftover safety guidelines, which recommend reheating all leftovers to an internal temperature of 165°F (74°C). Method-specific times and tips are drawn from USDA guidance, culinary references, and food science research on moisture retention and texture preservation during reheating.
Primary source: USDA Leftovers and Food Safety
Ingredient Substitutions
Our substitution data draws from established culinary references and food science resources. Each substitute includes the exact ratio, what it works well in, what to avoid using it for, and dietary flags (dairy-free, vegan, gluten-free). We prioritize substitutions that are widely tested and commonly recommended by culinary professionals.
How We Keep Data Accurate
Every item on this site includes a "last verified" date. This is the date we last confirmed the data against its primary source.
Our verification process works like this. First, each item is sourced directly from the databases and references listed above. Second, storage times and temperatures are checked against at least two authoritative sources before publishing. Third, we revisit items periodically to confirm that source guidelines have not changed. When the USDA updates its recommendations, we update our pages.
If you ever spot something that looks off, we want to know. Reach out at hello@pantryprofessor.com.
What We Are Not
PantryProfessor is an educational reference site. We are not a substitute for professional food safety consultation, medical advice, or dietary guidance. When in doubt about whether food is safe to eat, the safest answer is always: when in doubt, throw it out.
Our goal is to put trusted, government-sourced food safety data in front of you in a format that is fast, clear, and easy to use.