Glucomannan 
Earlier studies suggest the soluble fiber glucomannan reduces LDL— the “bad” cholesterol—but there are relatively few studies, most of which are small and of short duration. Here, doctors reviewed and analyzed findings from 12 placebo-controlled trials covering 370 adults and children who took 3 grams of glucomannan fiber per day for at least three weeks.
Overall, those taking 3 grams of glucomannan per day saw LDL decline by an average of 10 percent, and other non-HDL cholesterol decline by 7 percent.
Commenting on the findings, doctors said that because of its non- HDL cholesterol-lowering effects, government health agencies may wish to recommend adding glucomannan to the diet as a way to reduce chances of heart and circulatory events in the general population.
Polysaccharide and psyllium
Studies have found high-fiber diets reduce chances for several chronic diseases. In this study, 93 overweight or obese men and women, ages 19 to 68, took 5 grams of the dietary fibers polysaccharide or psyllium, or a rice flour placebo, before meals. All participants maintained their usual diet and lifestyle over the 12-month study period.
At three months, compared to placebo, the polysaccharide and psyllium fiber groups had significantly lower insulin levels, less insulin resistance, lower total cholesterol levels, and lower LDL cholesterol levels. Glucose levels were also lower in the polysaccharide group. Most of these improvements continued through six months, and by 12 months, those in the polysaccharide group also saw HDL— the “good” cholesterol—levels increase significantly compared to placebo.
Discussing the findings, doctors said that adding dietary fiber to the diet, without having to change an existing dietary pattern, may help maintain healthy glucose and insulin levels and improve lipids.
Reference: American Journal of Clinical Nutrition; March, 2017, Published Online
Natural Insights for Well Being September 2017
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