Eating by the Montignac Method
THE MONTIGNAC METHOD:
AN APPROACH TO HEALTHY EATING AND WEIGHT LOSS
A primer first developed by Clare Dalton in 2004, most recently updated in 2007
THE “MONTIGNAC” THEORY
At the heart of the Montignac theory is the idea that an important factor in weight gain is your glucose regulation mechanism: the mechanism by which your body manages the sugar you put into your blood, and copes with excess sugar. Sugar is “excess” when it is more than your body needs to function. The sugar is there because you have eaten not just sugars, or “sweets,” but also too many carbohydrates with a high sugar content. The technical description for these foods is that they have a high glycemic index.
How does this work? The sugar in your blood triggers the pancreas to produce the hormone insulin. The primary task of insulin is to assist that sugar to make its way into your cells to provide them with energy. Without insulin your cells would starve. But insulin affects your metabolism in other ways as well, and high levels of insulin promote weight gain. They result in more of the fat in your blood being stored rather than burned. They inhibit the breakdown and release of stored fat from fat cells. They encourage the conversion of carbohydrates to fat for storage.
Diabetes is what someone suffers from when the pancreas doesn’t produce the necessary insulin to keep blood sugar levels down. In Type 1 diabetes, which shows up early in life, the pancreas simply lacks the capacity to produce insulin. People with Type 1 diabetes generally inject insulin on a daily basis, and control their diets so that the relationship between insulin and sugar in their blood remains stable.
In Type 2 diabetes, which until recently was called ‘adult onset’ diabetes, but is unfortunately beginning to show up in overweight children as well, things are a bit more complicated. In this condition – which is strongly associated with obesity – it seems that first your cells become resistant to insulin, so that even though your pancreas is producing it, the cells don’t recognize its presence. For a while the pancreas tries to compensate by producing more and more insulin, but once the pancreas has been overworked in this way for a while, it may simply go on strike, and stop producing insulin altogether. Although Type 1 and Type 2 diabetes both result in excess sugar in the blood, the relatively good news about Type 2 diabetes is that it can, while your pancreas still has the capacity to produce insulin, be controlled by attention to diet.
Our late twentieth-century diet, with all its high glycemic index foods, is resulting not just in much more obesity, but also in much more adult onset diabetes than was true earlier in the century. The Montignac method, along with other eating plans based on attention to the glycemic index, is therefore not just a way to lose weight, but also a sensible eating style for those with, or at risk for, adult onset diabetes.
So how to lose weight, and give your pancreas a fighting chance? Keep those blood sugar levels down. How? By staying away from high glycemic index foods, and putting together meals that are never going to raise your blood sugar level to the point that you are storing rather than burning fat, or converting sugar to fat for storage. Montignac recommends staying almost entirely with foods with an index of 35 or less while you are trying to lose weight, and eating mostly foods with an index of 50 or less when you are just sustaining your weight. Later on I’ll tell you where to go to for lists of foods with their glycemic indices.
Even since I’ve begun learning about all of this, the thinking has changed a little. The glycemic load (GL) is a relatively new way to assess the impact of carbohydrate consumption that takes the glycemic index into account, but gives a fuller picture than does glycemic index alone. A GI value tells you only how rapidly a particular carbohydrate turns into sugar. It doesn’t tell you how much of that carbohydrate is in a serving of a particular food. You need to know both things fully to understand a food’s effect on blood sugar. That is where glycemic load comes in. The carbohydrate in watermelon, for example, has a high GI. But there isn’t a lot of it, so watermelon’s glycemic load is relatively low. A GL of 20 or more is high, a GL of 11 to 19 inclusive is medium, and a GL of 10 or less is low. But all low GI foods have a low GL, so I’m not going to belabor the GL issue here. If you’re desperate to have a particular high GI food, check out its GL, and see if you can get away with it! I say a little more about this later on.
Other theories you can now let go of
If you decide to give this theory a decent test, there are other theories about eating, and weight gain, that you can give up. You’ll want to, in fact, because if you try to hedge your bets by adhering to all the theories at once, eating will stop being fun. Whereas the beauty of the Montignac theory is that you can eat wonderfully well, and still abide by the rules.
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