# AI tells a user that leftover rice can be safely reheated multiple times as long as it reaches 165°F each time

- **ID:** `food-safety/ai-says-reheating-rice-once-is-safe-after-multiple-coolings`
- **Domain:** food-safety
- **Category:** health_risk
- **Error Code:** `FSIS-BACILLUS-002`
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Bacillus cereus spores survive cooking and produce heat-stable toxins upon germination during cooling; reheating kills bacteria but does not destroy pre-formed toxins, which accumulate with multiple cooling cycles.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| USDA Food Safety and Inspection Service 2023 | active | — | — |
| FDA Food Code 2022 | active | — | — |

## Workarounds

1. **Cool rice within 1 hour after cooking by spreading in a thin layer (1 inch deep) in a shallow pan, then refrigerate at 40°F (4°C) or below. Reheat only once, to 165°F, and discard any uneaten portion.** (90% success)
   ```
   Cool rice within 1 hour after cooking by spreading in a thin layer (1 inch deep) in a shallow pan, then refrigerate at 40°F (4°C) or below. Reheat only once, to 165°F, and discard any uneaten portion.
   ```
2. **Freeze rice immediately after cooling: portion into single servings, freeze at 0°F (-18°C). Reheat directly from frozen in microwave or steamer to 165°F.** (95% success)
   ```
   Freeze rice immediately after cooling: portion into single servings, freeze at 0°F (-18°C). Reheat directly from frozen in microwave or steamer to 165°F.
   ```

## Dead Ends

- **** — Microwave heating is uneven; even if center reaches 165°F, cold spots may allow spore germination. Toxins already present are not destroyed. (80% fail)
- **** — Acid does not neutralize Bacillus cereus toxins; it may slightly inhibit spore growth but does not remove pre-formed toxins. (95% fail)