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Vitamins Information (Home) > Side Effects > Fiber Fiber Side EffectsWhile people can be allergic to certain high-fiber foods (most commonly wheat), high-fiber diets are more likely to improve health than cause any health problems. Beans, a good source of soluble fiber, also contain special sugars that are often poorly digested, leading to gas. Special enzyme products are now available in supermarkets to reduce this problem by improving digestion of these sugars. Fiber reduces the absorption of many minerals. However, high-fiber diets also tend to be high in minerals, so the consumption of a high-fiber diet does not appear to impair mineral status. However, logic suggests that calcium, magnesium and multimineral supplements should not be taken at the same time as a fiber supplement. Bran, an insoluble fiber, reduces the absorption of calcium enough to cause urinary calcium to fall. In one study, supplementation with 10 grams of rice bran twice a day reduced the recurrence rate of kidney stones by nearly 90% in recurrent stone formers. However, it is not known whether other types of bran would have the same effect. Before supplementing with bran, people should check with a doctor, because some people even a few with kidney stones do not absorb enough calcium. For those people, supplementing with bran might deprive them of much-needed calcium. People with scleroderma (systemic sclerosis) should consult a doctor before taking fiber supplements or eating high-fiber diets. Although a gradual introduction of fiber in the diet may improve bowel symptoms in some cases, there have been several reports of people with scleroderma developing severe constipation and even bowel obstruction requiring hospitalization after fiber supplementation. Certain medicines may interact with fiber. Refer to drug interactions for a list of those medicines.
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