Does Cooking Affect the Glycemic Index of Foods?


pan fried eggs

The glycemic index (GI) provides a measure of how fast and how high a particular food can raise our blood glucose level. A food with a low GI usually means it causes a moderate rise in blood glucose, while foods with a high GI causes blood glucose levels to increase above favorable levels.

Fats and fibers are able to lower the GI of foods. Generally, the more cooked or processed food is, the higher the GI, but it can vary due to certain factors.

The following are a few examples:

Ripeness – Fruits and vegetable that are riper tend to have higher GI levels.
Processing – Taking whole fruits instead of juices, baked potatoes instead of mashed potatoes, both can help to prevent the GI from rising. Cooking methods – For example, how long the food is cooked. The less cooked the food is, the lower the GI.

Cooking Methods that Raises Glycemic Index
Changes in blood glucose levels after a meal are determined by the ratio of dietary carbohydrate and digestive enzymes, and the presence of other dietary factors, like fats and fibers, which are able to slow down carbohydrate digestion. Cooking methods that add heat to a grain or breaks apart a grain will increase the GI as it makes the dietary carbohydrates available for digestive enzymes.

Cooking Methods that Lower Glycemic Index
Adding fats and fibers into your diet will be able to slow down carbohydrate digestion and absorption, thus lowering GI. For instance, sautéing potatoes in olive oil will lower the GI as it adds fats and to the starchy potatoes carbohydrate. Slow-cooking methods, such as baking and steaming will result in a lower GI levels when compared against boiling and microwaving. Retaining the potato’s skin will add some fiber which then lowers the impact of the potato starch on blood glucose levels.

Taking in mind, no matter what sort of cooking methods used, some dietary carbohydrates, such as potatoes and grains, tend to have higher GI than others. The GI of any food is directly linked to your body’s ability to digest and absorb carbohydrates. These numbers will vary according to the health situations of individuals. For example, those with diabetes. It would be better to talk to your dietitian before you start planning your diet.

  1. Don’t overcook your food
  2. Choose less processed and whole foods
  3. Choose foods with high soluble fibre content (like Apples, beans and oats)

Sources:
www.diabetes.org
www.livestrong.com
www.montignac.com

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