Active learning ideas
Commercial food processing scales up preservation techniques to feed a population. This topic introduces students to industrial methods like Pasteurisation, Ultra-Heat Treatment (UHT), and various forms of dehydration like spray drying. Students analyze how these methods ensure food safety and extend shelf life while considering their impact on the nutritional value and sensory properties of the food.
Activity 01
Stations feature different types of milk: fresh, pasteurised, UHT, and powdered. Students compare the taste, color, and price, then research the specific heat treatment used for each.
How does pasteurisation differ from UHT?
Activity 02
Teams debate the merits of fresh produce versus commercially processed (frozen or canned) foods. They must consider factors like nutritional retention, cost, convenience, and food waste.
What nutritional losses occur during dehydration?
Activity 03
Students investigate different dehydration methods (sun drying, oven drying, freeze drying). They create a comparison chart showing which nutrients (like Vitamin C) are most affected by each method.
How do commercial methods ensure food safety at scale?
A few notes on teaching this unit
Watch Out for These Misconceptions
UHT milk has no nutrients compared to fresh milk.
Students often think high heat destroys all goodness. Through a peer-teaching activity, clarify that while some heat-sensitive vitamins are reduced, the protein and calcium content remains largely unchanged.
Canned foods are full of preservatives.
Many don't realize that the canning process itself (heat and airtight sealing) is the preservative. A gallery walk of canned food labels can help students see that many contain only the food, water, and perhaps a little salt.
Methods used in this brief
Principles of Food Preservation
Students will learn the underlying principles of preventing food spoilage by controlling moisture, temperature, and pH. They will evaluate traditional and modern preservation techniques.
8 methodologies
Food Additives and Labels
Students will decode food labels and understand the functions of various food additives. They will critically evaluate the health implications of synthetic versus natural additives.
8 methodologies