By: Maria Masters menshealth.com You hear the advice constantly: You need fiber. It's crucial to your health. Fine, but how much fiber, and how crucial is it? Maybe you're wondering, What is fiber, exactly? Let's start with the basics. Fiber is a type of carbohydrate that makes up the structural material in the leaves, stems, and roots of plants. But unlike sugar and starch—the other two kinds of carbs—fiber stays intact until it nears the end of your digestive system. This, it seems, is what makes fiber beneficial, and why you've probably heard you can't eat enough of it. Now read on to separate the facts from the fiction. All Fiber is Created Equal FALSE: There are two basic types of fiber, with different functions. Insoluble fiber is found in wheat bran, nuts, and many vegetables. Its structure is thick and rough, and it won't dissolve in water, so it zips through your digestive tract and increases stool bulk. Soluble fiber is found in oats, beans, barley, a...
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