Physiological processes that break down larger molecules into smaller ones constitute catabolism. An example of catabolism is hydrolysis (hi-drol'i-sis), which can decompose carbohydrates, lipids, and proteins. A water molecule is used to split these substances into two parts.

The hydrolysis of a disaccharide, for instance, results in two monosaccharide molecules (see fig. 4.1; read from right to left). In this case, the bond between the simple sugars breaks, and the water molecule supplies a hydrogen atom to one sugar molecule and a hydroxyl group to the other. Thus, hydrolysis is the reverse of dehydration synthesis.

Good Carb Diet

Good Carb Diet

WHAT IT IS A three-phase plan that has been likened to the low-carbohydrate Atkins program because during the first two weeks, South Beach eliminates most carbs, including bread, pasta, potatoes, fruit and most dairy products. In PHASE 2, healthy carbs, including most fruits, whole grains and dairy products are gradually reintroduced, but processed carbs such as bagels, cookies, cornflakes, regular pasta and rice cakes remain on the list of foods to avoid or eat rarely.

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