What is the proper method for cooling hot foods rapidly to prevent bacterial growth?

• A. Cool from 70°F to 40°F within 6 hours.
• B. Let cool at room temperature until it reaches 40°F.
• C. Cool from 135°F (57°C) or higher to 41°F (5°C) within 2 hours using shallow pans, ice baths, or blast chillers.
• D. Freeze immediately.

Answer: (C)

Rapid cooling to safe temperatures minimizes the time food spends in the danger zone where bacteria multiply. The best approach is to take hot foods and cool them from a high temperature down to 41°F (5°C) within about two hours using methods that maximize heat transfer, such as shallow pans (thin layers), ice baths, or blast chillers. These techniques increase surface area and speed up cooling, reliably reducing bacterial growth risk. Letting food rest at room temperature gives time for bacteria to multiply, and freezing right away doesn’t meet the rapid cooling requirement to reach a safe temperature promptly.