Low Carb Weight Lossthe last 12 years in the US. This popularity largely derives from the now-famous "Atkins Diet" written by the late Dr. Richard Atkins. While there is little question that carbohydrate reduction does work to cause weight loss, it generally is difficult for people to maintain this sort of diet and so far, the long term effects of these diets on human health remain largely unknown. Benefits of Low-Carbohdrate Diets:1: They are fast. Because most low-carb diets have an "induction phase" during which people eat extremely low amounts of carbohydrate, they usually cause a peculiar metabolic condition known as as "ketosis" wherein the body, in order to feed the brain absent sugar, produces large amounts of "secondary fuel" called "ketone bodies" that have the effect of reducing hunger and producing diuresis (water-loss by urination). Because of this water loss, people can lose as much as ten pounds in their first week on a low-carbohydrate diet. Of course the lost water is quickly reasimilated when ketosis stops. This accounts for the dramatic weight fluctuations that accompany low-carb diets. 2: They tend suit the meat-laden American concept of a "meal". Typically, people on low carbohydrate diets consume a lot of meat. This seems very appealing to people who may have been long-advised to avoid this kind of food. 3: Dramatic Blood Sugar Control: Often, when a person with type-2 diabetes starts a low-carbohydrate diet his or her blood sugar levels can literally improve overnight, sometimes very much. This combined with the improvement in blood sugar associated with weight loss makes low carbohdrate diets very tempting for diabetic patients and the physicians who treat them. Nevertheless, few people can mainain a very low carbohydrate intake for many years so even when it makes sense for a person to follow such a diet in the short term, a more macronutrient-balanced approach needs to be considered for the long-haul. Problems and Risks of Low-Carbohydrate Diets:1: No long-term data: So far, we don't have any good research results to help determine wether low carbohydrate dies are safe and beneficial in the long-term. 2: All-or-Nothing: Because strict low-carbohydrate diets require that people stay in the fluid-depleting state of ketosis, any "slip-up" or carbohydrate binge tends to cause rapid fluid regain that, of course, is reflected as a weight increase. 3: Monotony: Meat and cheese for every meal might sound appealing to someone who has long-refrained from such habits, but within days, many people find low-carb diets bland, boring and unpleasant. 4: Excessive Protein: Because of the emphasis placed upon meat consumption within low-carbohydrate diets, many people consume far more protein than they need. The problem with this is that excess protein cannot be stored by the body and therefore must be eliminated. This elimination places significant stress on the kidneys, particularly in the semi-dehydrated state of ketosis. There have been case-reports of serious kidney damage that appear to be associated with high protein intake from, among other causes, low-carbohydrate diets. 5:Cultural Evidence is Lacking: One of the most reassuring facts about low-fat (not low-carbohydrate) is that billions of people around the world consume low fat diets nearly daily (and have thus consumed for millenia) and live long and healthy lives. The statistics are far less reassuring as regards low-carbohydrate diets. Dr. Atkins, in his book, argues that native Americans living in the polar north ("Eskimos") traditionally consumed low-carbohydrate diets (fish, whale meat and blubber) and remained thin and healthy. While this is true, several practical problems remain. First, the "Eskimo" diet wasn't merely "low-carbohydrate", it was practically zero-carb and therefore rather different than the less severe diets popular today. Second, while the traditional Eskimo lifestyle proves that people are capable of surviving and even thriving in extremes of diet and climate, it doesn't argue that given a choice most people would actually choose to live this way. It still begs the question whether low-carbohydrate diets are liveable. Confusion Caused By Low-Carbohydrate Diets:Low carbohydrate diets and low-fat diets are polar opposites. Low carbohydrate diets are necessarily high fat diets whereas low fat diets are high in carbohydrates. This is confusing to many people if they are familiar with one approach (say low-carb) and then later try the other (low fat). A common complaint of dieters is the seemingly conflicting advice offered them by proponents of low carbohydrate and low fat diets. Conclusions:Low carbohydrate diets are effective and safe for weight control in the short term. Long term data are lacking. |
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Science of Weight Loss > Nutrition and Weight Loss > Diet and Dieting > Macronutrient Restricted Diets >
Low Carbohydrate Diets |
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