Montignac diet

The Montignac diet is a weight-loss diet that was popular in the 1990s, mainly in Europe. It was invented by Frenchman Michel Montignac (1944–2010), an international executive for the pharmaceutical industry, who, like his father, was overweight in his youth. His method is aimed at people wishing to lose weight efficiently and lastingly, reduce risks of heart failure, and prevent diabetes.

Carbohydrate-rich foods are classified according to their glycemic index (GI), a ranking system for carbohydrates based on their effect on blood glucose levels after meals. High-GI carbohydrates are considered "bad" (with the exception of those foodstuffs like carrots that, even though they have high GIs, have a quite low carbohydrate content and should not significantly affect blood sugar levels, also called low glycemic load or low GL). The glycemic index was devised by Jenkins et al. at the University of Toronto as a way of conveniently classifying foods according to the way they affected blood sugar and was developed for diabetics suffering from diabetes mellitus. Montignac was the first to recommend using the glycemic index as a slimming diet rather than a way of managing blood sugar levels, and recommendations to avoid sharp increases in glucose blood sugar levels (as opposed to gradual increases) as a strategy for anyone to lose weight rather than a strategy for diabetics to stabilize blood sugar levels.

Montignac's diet was followed by the South Beach Diet that also used the GI principle, and Michael Mosley's Intermittent Fasting 5:2 diet incorporates a recommendation to select foods with a low glycemic index or glycemic load.

"Bad carbohydrates", such as those in sweets, potatoes, rice and white bread, may not be taken together with fats, especially during Phase 1 of the Method. According to Montignac's theory, these combinations will lead to the fats in the food being stored as body fat. (Some kinds of pasta, such as "al dente" durum wheat spaghetti, some varieties of rice, such as long-grain Basmati, whole grains and foods rich in fiber, have a lower GI.)

Another aspect of the diet regards the choice of fats: the desirability of fatty foods depends on the nature of their fatty acids: polyunsaturated omega 3 acids (fish fat) as well as monounsaturated fatty acids (olive oil) are the best choice, while saturated fatty acids (butter and animal fat) should be restricted. Fried foods and butter used in cooking should be avoided.

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