By Lori A. Smolin, Mary B. Grosvenor
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This is known as the cis configuration. 2). Unsaturated fatty acids are categorized based on the location of the first double bond in the carbon chain. If the first double bond occurs after the sixth carbon (from the omega, or CH3, end) the fat is said to be an omega-6 fatty acid. The major omega-6 fatty acid in the American diet is linoleic acid, which is plentiful in vegetable oils. indd 63 8/25/10 11:58:43 AM 64 basic nutrition skin integrity, fertility, and maintaining red blood cell structure.
Review Fiber cannot be digested by human enzymes in the gastrointestinal tract, so it is not absorbed into the body. Nonetheless, a diet high in fiber is important to human health. Fiber is classified as either soluble or insoluble. Soluble fiber absorbs water and forms viscous solutions. It slows nutrient absorption and helps reduce blood cholesterol levels. In the large intestine, soluble fiber can be broken down by intestinal bacteria producing gas and acids, some of which can be absorbed into the body.
When sugar is consumed, it causes a rapid rise in blood glucose, which is thought to fuel hyperactive behavior. However, research on sugar intake and behavior has failed to support the connection between sugar and hyperactivity. The hyperactive behavior observed after sugar consumption is likely to be due to other factors. For example, the excitement of a birthday party, rather than the sugar in the cake and ice cream, are more likely the cause of the hyperactive behavior. Other factors, including caffeine consumption, lack of either physical activity or sleep, the desire for more attention, and overstimulation, are likely to play a role.