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What Is The Relationship Between The Absorption Of Triglycerides And Fat-Soluble Vitamins?

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Due to the close relationship between the absorption of triglycerides and fat-soluble vitamins, disorders of fat absorption are invariably always associated with a disorder of the absorption of fat-soluble vitamins. Esters of fat-soluble vitamins, dissolved in nutritional fat, are hydrolyzed in the intestinal lumen by pancreatic carboxylic ester hydrolases (Ballard et al., 2007, Reboul and Borel, 2011). The underlying mechanisms of water-soluble vitamins being absorbed are more complex and less uniform than those of the fat-soluble vitamins. Some water-soluble vitamins, such as folic acid, must be transformed in the intestinal lumen prior to absorption. The influence of high- and low-fiber diets on urinary riboflavin excretion was examined…show more content…
The glucomannan konjac mannan has a lowering effect on vitamin E absorption in healthy volunteers and in diabetic patients (Jenkins et al., 20001). This could be demonstrated with the vitamin E tolerance test when the glucomannan was added to the test meal. It is uncertain whether there are relations between vitamin K metabolism and ingestion of dietary fiber. Investigations on the influence of dietary fiber on vitamin K absorption and serum vitamin K concentration are not available. The prothrombin and thromboplastin times of diabetics who were treated with a high-fiber diet (25 to 35 g dietary fiber per 1000 kcal) for an average of 21 months remained unchanged. This indicates that the high-fiber diet does not impair vitamin K absorption (Alonso-Sande et al., 2009, Scholfield et al., 1990). The underlying mechanisms of water-soluble vitamins being absorbed are more complex and less uniform than those of the fat-soluble vitamins. Some water-soluble vitamins, such as folic acid, must be transformed in the intestinal lumen prior to absorption. The influence of high- and low-fiber diets on urinary riboflavin excretion was examined in healthy subjects. Compared to a control group receiving a low-fiber diet, coarse and fine bran, cellulose, and cabbage increased urinary excretion for 8 h when 15 mg riboflavin-5-phosphate were administered orally with breakfast. The authors concluded that dietary fiber accelerates GI riboflavin
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