... to understand the significance of food structure for optimal food quality. The most obvious and widespread forms of deterioration are due to microbial attack. Bacteria, yeasts and fungi will compete with man for his food if permitted, and the most elementary forms of preservation have been, without knowledge of their nature, methods of dealing with this problem This subject looks at the processes that develop the structure of food through cooling and heating. Theoretical aspects of cooling (freezing) and heating (baking) processes will be reviewed as well as the effect of these processes on the structure of food will be discussed. 2.0 EFFECTS OF COOLING 2.1 Freezing Freezing is one of the oldest and most widely used methods of food preservation, which allows preservation of taste, texture, and nutritional value in foods better than any other method1. The freezing process is a combination of the effects of low temperatures at which microorganisms cannot grow, chemical ...

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