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The Portfolio Diet is a therapeutic plant-based diet created by British researcher David J. Jenkins in 2003 to lower blood cholesterol. [1] [2] The diet emphasizes using a portfolio of foods or food components that have been found to associate with cholesterol lowering to enhance this effect.
For example, Hensrud advised against using niacin, which lowers cholesterol but has side effects, among them flushing. It also can raise liver enzymes when taken in large doses, Hensrud said ...
Trials looking at high doses (> 4 g/day) of plant sterols or stanols are very limited, and none have yet to be completed comparing the same high dose of plant sterol to plant stanol. The debate regarding sterol vs. stanol safety is centered on their differing intestinal absorption and resulting plasma concentrations.
However, dietary therapy is often insufficient to control this disease since plant sterols are constituents of all plant-based foods. Statins have been used, and while these lower cholesterol levels and may ameliorate atherosclerotic disease, plant sterol levels are insufficiently lowered by their use alone. [citation needed]
β-Sitosterol is widely distributed in the plant kingdom.It is found in vegetable oil, nuts, avocados, and derived prepared foods such as salad dressings. [2] Olavius algarvensis, a species of marine annelid, predominantly incorporate β-sitosterol into their cell membranes instead of cholesterol, though cholesterol is also present in said membranes.
Plant stanols are present in small amounts in human diet. Their main sources are whole-grain foods, mostly wheat and rye.The daily intake of stanols in the average western diet is about 60 mg/d, whereas the intake of plant sterols is about 150–300 mg/d and that of cholesterol is 500–800 mg/d.
Plant sterols were first shown in the 1950s to lower LDLs and cholesterol. [7] Since then, numerous studies have reported the lipid-lowering effects of dietary phytosterols, including campesterol. [8] In basic research, campesterol competes with cholesterol, thus reducing the absorption of cholesterol in the human intestine. [9]
A serving of Benecol buttery spread supplies 1 g of plant stanols." [6] Consuming more than 3g of plant stanol per day is not recommended and Benecol foods may not be appropriate for pregnant or breast feeding women, and children under 5 years old. [7] Two reviews confirm that plant stanol and sterol esters lower cholesterol levels. [8] [9]
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