Absorption of electrolytes in the small intestine

Sodium is absorbed along the length of the small bowel but mainly in the jejunum via active transport. Magnesium, phosphate and potassium are absorbed throughout the small intestine.

Absorption of most water-soluble vitamins takes place by diffusion. The exception is vitamin B12, which combines with intrinsic factor (produced by the parietal cells in the stomach) for active transport and is mainly absorbed in the terminal ileum.

Carbohydrates are broken down by digestive enzymes in the intestine into simple sugars (glucose, galactose and fructose), which are then absorbed into the bloodstream via the intestinal mucosa, using either active transport or facilitated diffusion. Proteins are hydrolysed by proteolytic digestive enzymes into amino acids, which are absorbed by active transport.

Fats are emulsified and then broken down into glycerol, fatty acids and glycerides, primarily by the enzyme pancreatic lipase.

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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