Elements Challenging the Concept, Principle, & Strict Application of Glycemic Index
The fact is that many bodybuilding, health, & fitness enthusiasts stake their entire moral judgment of carbohydrate foods based on their glycemic index (GI) without realizing that a considerable set of confounders challenges its validity. Becoming blindly enamored with something that may enhance our physiques &/or health is natural, and something we've all been guilty of. But alas, the GI data is neither perfect nor consistent, nor is it free of bugs. Consider the following facts, and re-think your obsession with GI & what you think you know about GI.
A POSSIBLE DEFINITION SHIFT
The current general definition of GI is a food's ability to raise blood sugar, which almost automatically is regarded in terms of glucose entry into the blood. However, recent eye-opening research by Schenk & colleagues clearly showed that the rate of disappearance of glucose from systemic circulation is an important determinant of GI - not just glucose's rate of entry into circulation . They found that the lower GI of bran cereal was due to a quicker/sooner surge of insulin sweeping glucose out of circulation - not a slower appearance/entrance of glucose as once assumed. Although strictly speculative at this point, this phenomenon may have possible performance detriment implications (ie, rebound hypoglycemia) in sensitive individuals if meals of this nature are mistimed relative to training.
DETERMINATION VS. APPLICABILITY
GI values are determined in an overnight-fasted state using isolated foods. This is not a reflection of real life, where the digestion/absorption of previous meals, as well as the context of the carbohydrate food can drastically alter GI.
The interplay of many variables can either raise or lower GI, and are often difficult to control. Increased acidity, the presence of fiber, fat, and certain protein foods can lower glycemic response. Reduced particle size, greater ripeness, and heat in cooking can raise glycemic response.
GLYCEMIC LOAD DISPARITY
Glycemic load (GL), which is the amount of carbohydrate per serving or unit of volume, is not always directly proportional to GI. For example, watermelon has a GI of 72, which is considered high. Low-GI advocates have vilified watermelon without realizing the fact that it has a relatively low glycemic load, approximately 6g carbohydrate per 4oz serving. The same disparity of GI & GL applies to carrots, potatoes, and even sports drinks such as Gatorade.
SATIETY INDEX DISPARITY
Lower-GI foods have been associated with greater satiety, but most of this data comes from single-meal experimental designs. Longer-term studies on GI & satiety are conflicting, and not always controlled for energy intake and energy density of the test meal . In the longest study to date on GI & satiety is an ad libitium 30d crossover design where Kiens & Richter observe no difference in amount of consumption . In this metabolic study, a LOWER resistance to insulin was seen in the high-GI group at the end of the trial. GI does not reliably correspond with satiety index (SI). White rice, wheat bread, and potatoes all have high GIs, but rank among the top of the list for delaying the onset of hunger. In fact, Holt's team found that potatoes had by far the highest SI of all the foods tested .
As a classic example of chaos physics, the typical rules that predict GI do not necessarily help in predicting insulin response. Unfortunately for GI-conscious people, insulin is usually what they are trying to control. Despite having a very low GI of 15-36, milk and yogurt have a high insulin index equivalent to that of the high-GI white bread . Baked beans, another low-GI food, have a very high insulin index of 120. Cheese, beef, and fish have II's that are comparable to many carbohydrate foods.
Coingestion of fat with carbohydrate slows gastric emptying and thus the release of glucose into the blood, ultimately lowering GI. While this is usually true for GI, the degree of insulin response evoked by this combination is determined by the degree of the fat's saturation. For example, Collier & others observed that butter coingested with potato not only fails to lower postprandial insulinemia, it actually causes a synergistically heightened insulin response, even in healthy subjects [6,7].
Foods that should have a low GI due to their high fat content do not always have a low GI. Examples are fries, cookies, croissants, and doughnuts. Incidentally, these foods also have a high insulin index, presumably because their fat is mostly saturated. As of this writing, full-fat ice cream (low GI of appx 37) has not been tested for II, but it's safe to assume that it probably has disparate GI & II values.
Rasmussen & colleagues observed no increased insulin response with the addition of 40g or 80g olive oil, but saw a significant increase with 50g & 100g butter . Joannic's team observed a coingestion of carbohydrate with fats of increasing degree of unsaturation having a corresponding decrease in insulin response . A more recent study by Robertson & colleagues compared the effect of MUFA, PUFA, & SFA coingestion with carbohydrate and observed SFA's superior ability to raise postprandial insulin levels .
Coingestion of protein with carbohydrate is often recommended to lower GI, but it doesn't necessarily lower insulin response. Gannon & Nutall's research on type-2 diabetics showed that coingested cottage cheese & glucose raised insulin levels beyond either food separately, indicating a synergistic effect . Van Loon & colleagues saw a similar phenomenon when comparing the insulin effect of various carb-protein/amino acid and carb-only solutions . Those containing free leucine, phenylalanine, & arginine, and the drinks with free leucine, phenylalanine, & wheat protein hydrolysate were followed by the largest insulin response (101% and 103% greater, respectively, than with the carb-only solution).
GI & OBESITY - SLIM CHANCE FOR CORRELATION
a systematic review of human intervention studies comparing the effects of high and low-GI foods or diets arrived at the following results :
---- in a total of 31 short-term studies, low-GI foods were associated with greater satiety or reduced hunger in 15 studies, whereas reduced satiety or no differences were seen in 16 other studies.
---- low-GI foods reduced ad libitum food intake in 7 studies, but not in 8 other studies. In 20 longer-term studies (<6 months), weight loss on a low-GI diet was seen in 4 and on a high-GI diet in 2, with no difference recorded in 14 studies.
---- an exhaustive assessment of these human intervention trials found no significant difference in the average weight loss between low & high GI diets. in conclusion, the current body of research evidence does not indicate that low-GI foods are superior to high-GI foods in regard to treating obesity.
Don't get it twisted, GI is a definitely useful tool that gives us clues to the behavior of certain foods, but that's exactly the main point of this article. Clues; mere hints are all we get from our current knowledge of GI. Successful application of GI is most consistent when we use higher GI sources to enhance the speed of postworkout glycogenesis, and lower-GI starch foods tend to be more micronutrient dense than their higher-GI counterparts, but that's really about the extent of it. Satiety, insulin response, & surrounding factors altering glucose kinetics are all much like a roll of the dice in terms of bottom-line certainty & reliability. Like all things in science - especially the deep bubbly cauldron that is applied nutritional science - it ain't all that simple. All avenues in this area are winding & complex.