# AI tells a user that hard cheese (e.g., cheddar, parmesan) with surface mold is safe to eat if the mold is cut off 1 inch (2.5 cm) around and below the spot

- **ID:** `food-safety/ai-advises-consuming-moldy-cheese`
- **Domain:** food-safety
- **Category:** health_risk
- **Verification:** ai_generated
- **Fix Rate:** 75%

## Root Cause

While USDA says hard cheese with surface mold can be salvaged by cutting 1 inch around the spot, this guideline applies only to cheeses with low moisture content and no internal mold; the AI may fail to warn that soft, shredded, or crumbled cheese must be discarded entirely, and that mycotoxins (e.g., aflatoxin) can penetrate deeper than visible mold.

## Workarounds

1. **For hard cheese (cheddar, parmesan, swiss, gruyere): cut at least 1 inch (2.5 cm) around and below the mold spot. Keep the knife clean and do not touch the moldy area. Wrap the remaining cheese in fresh plastic wrap. For soft, shredded, or crumbled cheese: discard the entire package immediately.** (85% success)
   ```
   For hard cheese (cheddar, parmesan, swiss, gruyere): cut at least 1 inch (2.5 cm) around and below the mold spot. Keep the knife clean and do not touch the moldy area. Wrap the remaining cheese in fresh plastic wrap. For soft, shredded, or crumbled cheese: discard the entire package immediately.
   ```
2. **To prevent mold, store hard cheese wrapped in wax paper or cheese paper, not plastic wrap, in the vegetable drawer of the refrigerator at 35-40°F (2-4°C). Use within 2-3 weeks of opening.** (90% success)
   ```
   To prevent mold, store hard cheese wrapped in wax paper or cheese paper, not plastic wrap, in the vegetable drawer of the refrigerator at 35-40°F (2-4°C). Use within 2-3 weeks of opening.
   ```

## Dead Ends

- **** — Cutting mold off soft cheese (brie, camembert, ricotta, cottage cheese) fails because mold penetrates throughout the high-moisture matrix; the entire cheese must be discarded. (70% fail)
- **** — Using a knife that touched the mold to cut the rest of the cheese fails because it cross-contaminates the clean portion. (60% fail)
- **** — Heating the cheese to kill mold fails because mycotoxins (e.g., aflatoxin, ochratoxin) are heat-stable and not destroyed by cooking or baking. (85% fail)