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四川大学人体生理学(I)课件CHAPTER6 DIGESTION AND ABSORPTION
Background: Iron deficiency is common in obese subjects. This may be due to an increase in serum hepcidin and a decrease in iron absorption from adiposity-related inflammation.
Vegetarian diets often contain more copper than do nonvegetarian diets, but observations of decreased plasma copper associated with vegetarian diets suggest that these diets have lower copper bioav...
Viscous gums enhance viscosity in the upper gastrointestinal lumen, quickly disturbing motility and promoting fluid secretion.
In several countries cereals are now enriched with folic acid to reduce the risk of neural tube defects. Human studies suggest that folic acid interferes with zinc absorption. This raises concerns ...
Phenolic compounds act as food antioxidants. One of the postulated mechanisms of action is chelation of prooxidant metals, such as iron. Although the antioxidative effect is desirable, this mechani...
Osteoporosis diminishes the quality of life in adults with cystic fibrosis (CF). Vitamin D deficiency resulting from malabsorption may be a factor in the etiology of low bone mineral density (BMD) ...
Iron-fortified school breakfasts have been introduced in Peru to combat childhood iron deficiency.
Ascorbic acid has a pronounced enhancing effect on the absorption of dietary nonheme iron when assessed by feeding single meals to fasting subjects. This contrasts with the negligible effect on iro...
Reducing the phytate content in grains by genetic manipulation is a novel approach to increasing nonheme-iron absorption from mixed diets. Fractional iron absorption from a genetically modified str...
The extent of fat emulsification affects the activity of digestive lipases in vitro and may govern digestion and absorption of dietary fat.
Adequate mineral intake is a crucial part of a healthy diet for children—it supports appropriate growth and development and provides protection against childhood conditions like anemia and helps to...
Phytosterol feeding in human clinical trials has had generally small and inconsistent effects on serum cholesterol concentrations, raising doubts about the importance of phytosterols in natural die...
Inositol hexaphosphate (IP6) is a well-known inhibitor of iron absorption, whereas the effects of the less-phosphorylated derivatives of IP6 are less known.
The potential benefits of increasing calcium intake in small children must be balanced with the potential risk to iron utilization from high calcium intakes.

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