Carbohydrate foods:
Carbohydrate foods are one of the best sources of energy for our body. Foods high in carbohydrate include fruit, milk, yoghurt, breads, cereals, legumes (eg dried beans, lentils, chickpeas) and starchy vegetables like corn, potato, and sweet potato.
Not all carbohydrate foods are the same. All carbohydrate foods are converted to glucose, but they do so at different rates – some slow, some fast. Previously, carbohydrate foods were grouped according to how much sugar and starch (complex carbohydrate) they contained.
Foods high in sugars include fruit, dairy foods and table sugar (sucrose), whereas foods high in starch include breads, cereals, legumes, and starchy vegetables. It was assumed that sugars were quickly absorbed into the blood while starches were slowly absorbed. Based on these assumptions, people were advised to eat mainly starches and to limit foods that were high in sugars.
The Glycemic Index
In the 1980s, a new method of classifying carbohydrate foods called the Glycemic Index (GI) was invented. It proved once and for all that not all sugars are absorbed quickly into the blood and that not all starches are slowly absorbed.
The GI is a ranking of carbohydrates in food according to their effect on blood glucose (sugar) levels (BGLs) after eating. Foods with a low GI (55 or less) cause blood glucose levels to rise more slowly, over a longer period of time than high GI foods (70 or more).
Therefore, lower GI foods are the best choices when trying to maintain constant energy levels throughout the day, and when aiming to keep BGLs steady for longer. Higher GI foods, on the other hand, may be useful for athletes during prolonged physical activity (longer than one hour) to top up the body’s energy supply quickly, and to replace lost energy and carbohydrate (glycogen) stores immediately after their event.
Benefits of a Low GI Diet
Research has shown that a higher GI diet may increase the risk of developing type 2 diabetes and heart disease. On the other hand, a lower GI, high fibre diet may help reduce the risk of developing type 2 diabetes. A low GI diet may also help reduce triglycerides, and total and LDL (bad) cholesterol and raise HDL (good) cholesterol, which overall may help protect against heart disease.
Another major risk factor for developing both type 2 diabetes and heart disease is being overweight or obese. Low GI foods may enhance the feelings of fullness after eating. This may assist in weight loss as it can help reduce overeating and help keep people feeling fuller for longer so that their total kilojoule intake may be reduced.
Eating the Low GI Way
In order to eat a lower GI diet, all carbohydrate foods that you eat do not need to be low GI. In order to lower the average GI of your diet, you should try to eat at least one serve of low GI carbohydrates at each meal, or base at least two meals each day on low GI choices. The following table lists commonly eaten lower GI foods:
Food Group
Examples
Breads
W holegrain, Multigrain, Fruit loaf
Cereals
Pasta, noodles, rice vermicelli
Basmati or Doongara rice
Breakfast cereals eg. All-bran, Guardian, Traditional Rolled Oats
Vegetables - starchy
Sweet potato, Sweet corn
Legumes
All dried beans (except broad), lentils and chickpeas
Fruits
Orchard fruits: eg apples, apricots, grapefruits, oranges, pears, peach, plums.
Dairy
Milk, yoghurt, custard, ice cream (choose low fat options)
Answered by Gyan Singh
at
2:08 PM on June 28, 2008