Foods, Nutrition, and Food Safety
Domain 4: Foods, Nutrition, and Food Safety
This domain tests nutrient functions, digestion and metabolism, dietary guidance, meal planning, food safety, and food science.
Core rules and concepts
- The six nutrient classes are carbohydrates, proteins, fats, vitamins, minerals, and water. Water-soluble vitamins are not stored in large amounts; fat-soluble vitamins (A, D, E, K) require fat for absorption and can accumulate.
- MyPlate and the Dietary Guidelines emphasize variety, proportionality, and limiting added sugars and sodium.
- Food safety uses the temperature danger zone (40°F–140°F), FAT TOM conditions for pathogen growth, and proper cooking temperatures; poultry should reach 165°F.
- Cross-contamination is prevented by separating raw animal foods, washing produce, and sanitizing surfaces.
- Food science explains changes such as gelatinization, caramelization, and emulsion.
Worked example
A student leaves cooked rice at room temperature for four hours at a potluck. The instructor flags it because Bacillus cereus can grow in cooked rice left in the danger zone. The corrective action is to discard it, not simply reheat it, because toxins may be heat-stable. The reasoning: time-temperature control prevents pathogen growth; reheating does not always destroy preformed toxins.
Traps that cost marks
- Judging doneness by color rather than temperature.
- Assuming reheating makes unsafe food safe.
- Mixing up fat-soluble and water-soluble vitamin risks.
- Ignoring cross-contamination from cutting boards.