Let’s revisit the high-carb menu as it relates to insulin/glucagon balance. Those healthy-looking menus from the diets espoused by Barnard, McDougall, and the Diamonds stoke your furnace with grains, fruits, and vegetables but are deficient in two macronutrients—protein and fat (essential fatty acids)—that help slow down the release of sugars into the bloodstream.
When protein and fat accompany carbohydrates into the stomach, digestion is slowed, allowing the release of sugars into the bloodstream in a time-release manner. In other words, the sugars are not just dumped into the bloodstream, which would generate a gush of insulin; they are slowly released into the bloodstream, providing a steadier stream of glucose to the brain and peripheral tissues. Because the energy is used immediately, insulin is not needed to store the excess.
When a meal doesn’t contain an adequate amount of protein and fat to balance the carbohydrates, sugars are both digested quickly and released quickly into the bloodstream. Insulin pours from the pancreas in a desperate attempt to stabilize the critical level of blood sugar, and many of those carbohydrate calories will be stored as fat.
Why, then, doesn’t everyone who eats a high carbohydrate diet get fat? Dr. Barry Sears, author of Enter the Zone, wrote about the role genetics plays in insulin/glucagon balance.
People’s genetic insulin responses to carbohydrates are diverse. In about 25 percent of a normal population, insulin response to carbohydrates is very blunted. When these lucky people eat excess carbohydrates, their insulin levels don’t rapidly surge upward. They can consume large amounts of carbohydrates and not get hungry or fat. (These people often do very well on high-carbohydrate diets, so the dietary establishment elevates them to iconlike status to demonstrate the moral superiority of such a diet. Heck, these people just had a lucky draw in the genetic lottery.)
On the other hand, 25 percent of an otherwise normal population has an unlucky genetic draw that dictates an extremely elevated insulin response to carbohydrates. These people simply have to look at a carbohydrate and they begin gaining fat.
Between these two extremes lies the other 50 percent of the American population. These people respond normally to carbohydrates, which means that if they eat too much carbohydrate they’ll have an elevated insulin response—not as elevated as the unluckiest 25 percent, but still elevated enough to do all the damage described above. These people will always fail on a high-carbohydrate diet. They’re accused of being weak-willed gluttons who can’t control themselves, when in fact they were just born with unfortunate genes.
Yes, some people will do well on high carbohydrate diets such as those found in the Diamonds’ book, Fit for Life, or the McDougall Plan. These people can eat carbohydrates willy-nilly and never suffer the unpleasant consequences of excess carbs like the rest of us. And sometimes, they do radiate a certain moral superiority about it.
The rest of us, for reasons as diverse as our lifestyles or the way our bodies are made, aren’t so lucky. When we eat a diet high in carbohydrates, our bodies are thrown into hormonal imbalance and we’re sensitive to even the good carbohydrates found in fruits, vegetables, and grains.
For example, Samantha commented that she notices an immediate insulin reaction when she eats rice cakes. Judy said, "I never realized how sweet vegetables are!" Please notice that rice cakes and vegetables are not "bad foods." They are terrific foods, and your body will love them if you eat them in balance with other foods to control the release of insulin.
If it’s difficult to believe that a grain-and-vegetable-based diet will put on excess fat pounds, visit your local beef farmer and ask him how he prepares his beef for butchering. He fattens it up for market by "graining" it. He feeds the cattle extra grain to marbleize the meat—to add fat to the muscle tissue.
In that sense, we aren’t any different from beef cattle. If we want to fatten ourselves up, we can "grain" ourselves and pack on the pounds, which is exactly what many of us have been doing for years in the form of whole-grain breads, spaghetti, and cereals.
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