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A low-GI diet promotes eating whole grain products since they have a low GI. Fats and proteins are unrestricted since only carbohydrates have a GI rating.

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A low-GI diet can help prevent or treat obesity and diseases related to obesity, like type 2 diabetes. It can also help improve cholesterol, lose weight, reduce cancer risk, and reduce heart disease risk.

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The GI Diet isn't an end all for a complete healthy diet. Following a strict GI Diet doesn't encompass the fat, protein, sugar, and fiber content in the foods you eat so it shouldn't be the only factor. A GI diet also struggles to take into account that most foods are eaten within a mixture of other foods; it's hard to measure the actual positive effect it may have when considering the complete meal.

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Low-GI (Glycemic Index) Diet and What it Does:

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Low-GI (Glycemic Index) Diet and What it Does:

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"The glycemic index measures how rapidly food raises blood sugar levels. Low-GI foods help you feel fuller longer, keeping your body from producing so much insulin." (DK) This diet is supposed to be used to fight high blood sugar levels which is prevalent in Type 2 diabetes.

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Fiber is supposed to be incredibly fulfilling for long periods of time which in turn, should reduce the amount people feel the need to eat. This helps with weight loss and it's a good option for things like blood sugar spikes after meals which can help avoid insulin resistance.

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This eating plan comes with a host of health benefits. However, it also comes with some drawbacks.

The low glycemic (low GI) diet is based on the concept of the glycemic index (GI).

Studies have shown that the low GI diet may result in weight loss, reduce blood sugar levels, and lower the risk of heart disease and type 2 diabetes.

However, the way it ranks foods has been criticized for being unreliable and failing to reflect foods' overall healthiness.

This article provides a detailed review of the low GI diet, including what it is, how to follow it, and its benefits and drawbacks.

Carbohydrates are found in breads, cereals, fruits, vegetables, and dairy products. They're an essential part of a healthy diet.

When you eat any type of carb, your digestive system breaks it down into simple sugars that enter the bloodstream.

Not all carbs are the same, as different types have unique effects on blood sugar.

The glycemic index (GI) is a measurement system that ranks foods according to their effect on your blood sugar levels. It was created in the early 1980s by Dr. David Jenkins, a Canadian professor ().

The rates at which different foods raise blood sugar levels are ranked in comparison with the absorption of 50 grams of pure glucose. Pure glucose is used as a reference food and has a GI value of 100.

The three GI ratings are:

Foods with a low GI value are the preferred choice. They're slowly digested and absorbed, causing a slower and smaller rise in blood sugar levels.

On the other hand, foods with a high GI value should be limited. They're quickly digested and absorbed, resulting in a rapid rise and fall of blood sugar levels.

You can use this database to find the GI value (and glycemic load, described below) of common foods.

It's important to note that foods are only assigned a GI value if they contain carbs. Hence, foods without carbs won't be found on GI lists. Examples of these foods include:

SUMMARY
The glycemic index (GI) is a ranking system that classifies carb-containing foods by their effect on blood sugar levels. It was created in the early 1980s by Dr. David Jenkins.

A number of factors can influence the GI value of a food or meal, including:

The type of sugar it contains. There's a misconception that all sugars have a high GI. The GI of sugar ranges from as low as 23 for fructose to up to 105 for maltose. Therefore, the GI of a food partly depends on the type of sugar it contains.

The structure of the starch. Starch is a carb comprising two molecules - amylose and amylopectin. Amylose is difficult to digest, whereas amylopectin is easily digested. Foods with a higher amylose content will have a lower GI ().

How refined the carb is. Processing methods such as grinding and rolling disrupt amylose and amylopectin molecules, raising the GI. Generally speaking, the more processed a food is, the higher its GI ().

Nutrient composition. Adding protein or fat to a meal can slow digestion and help reduce the glycemic response to a meal (, ).

Cooking method. Preparation and cooking techniques can affect the GI too. Generally, the longer a food is cooked, the faster its sugars will be digested and absorbed, raising the GI.

Ripeness. Unripe fruit contains complex carbs that break down into sugars as the fruit ripens. The riper the fruit, the higher its GI. For example, an unripe banana has a GI of 30, whereas an overripe banana has a GI of 48 ().

SUMMARY
The GI of a food or meal is influenced by a number of factors, including the type of sugar it contains, the structure of the starch, the cooking method, and the level of ripeness.

The rate at which foods raise blood sugar levels depends on three factors: the types of carbs they contain, their nutrient composition, and the amount you eat.

However, the GI is a relative measure that doesn't take into account the amount of food eaten. It's often criticized for this reason ().

To solve this, the glycemic load (GL) rating was developed.

The GL is a measure of how a carb affects blood sugar levels, taking both the type (GI) and quantity (grams per serving) into account.

Like the GI, the GL has three classifications:

The GI is still the most important factor to consider when following the low GI diet.

However, the Glycemic Index Foundation, an Australian nonprofit raising awareness about the low GI diet, recommends that people also monitor their GL and aim to keep their total daily GL under 100.

Otherwise, the easiest way to aim for a GL under 100 is to choose low GI foods when possible and consume them in moderation.

SUMMARY
The glycemic load (GL) is a measure of the type and quantity of the carbs you eat. When following the low GI diet, it's recommended that you keep your daily GL under 100.

Diabetes is a complex disease that affects millions of people worldwide ( 6).

Those who have diabetes are unable to process sugars effectively, which can make it difficult to maintain healthy blood sugar levels.

However, good blood sugar control helps prevent and delay the onset of complications, including heart disease, stroke, and damage to the nerves and kidneys (, , ).

A number of studies suggest that low GI diets reduce blood sugar levels in people with diabetes (, 11, ).

A 2019 review of 54 studies concluded that low GI diets reduced hemoglobin A1C (a long-term marker of blood sugar control), body weight, and fasting blood sugar levels in people with prediabetes or diabetes ().

What's more, some research has linked high GI diets with a greater risk of developing type 2 diabetes. One study in over 205,000 people found that those with the highest GI diets had up to a 33% greater risk of developing type 2 diabetes than those who consumed the lowest GI diets ().

A systematic review of 24 studies reported that for every 5 GI points, the risk of developing type 2 diabetes increased by 8% ( 14).

The low GI diet may also improve pregnancy outcomes in women with gestational diabetes, a form of diabetes that occurs during pregnancy.

Moreover, the low GI diet has been shown to reduce the risk of macrosomia by 73%. This is a condition in which newborns have a birth weight over 8 pounds and 13 ounces, and it's associated with numerous short- and long-term complications for the mother and baby ().

SUMMARY
The low GI diet appears to reduce blood sugar levels in people with diabetes. Diets higher in GI have also been associated with an increased risk of type 2 diabetes.

Studies have shown that the low GI diet may also have other health benefits:

Improved cholesterol levels. One study showed that low GI diets reduce total cholesterol by 9.6% and LDL (bad) cholesterol by 8.6%. LDL cholesterol is also associated with an increased risk of heart disease and stroke (16, , 18, 19).

May help you lose weight. Some evidence suggests that low GI diets can promote fat loss. However, more research is needed to determine whether low GI diets are effective for long-term weight loss (16, , ).

May reduce the risk of cancer. Some studies suggest that people who consume high GI diets are more likely to develop certain types of cancer, including endometrial, colorectal, and breast cancer, compared with people on low GI diets (, 23, ).

May reduce the risk of heart disease. Recent research has strongly associated high GI and GL diets with an increased risk of heart disease (, ).

SUMMARY
Low GI diets have been associated with a reduction in weight and cholesterol. On the other hand, high GI diets have been linked to heart disease and an increased risk of certain cancers.

There's no need to count calories or track your protein, fat, or carbs on the low GI diet.

Instead, the low GI diet involves swapping high GI foods for low GI alternatives.

There are plenty of healthy and nutritious foods to choose from. You should build your diet around the following low GI foods:

Bread: whole grain, multigrain, rye, sourdough

Breakfast cereals: steel cut oats, bran flakes

Fruit: apples, strawberries, apricots, peaches, plums, pears, kiwi, tomatoes, and more

Vegetables: carrots, broccoli, cauliflower, celery, zucchini, and more

Starchy vegetables: sweet potatoes with an orange flesh, corn, yams, winter squash

Legumes: lentils, chickpeas, baked beans, butter beans, kidney beans, and more

Pasta and noodles: pasta, soba noodles, vermicelli noodles, rice noodles

Rice: basmati, Doongara, long grain, brown

Grains: quinoa, barley, pearl couscous, buckwheat, freekeh, semolina

Dairy and dairy replacements: milk, cheese, yogurt, coconut milk, soy milk, almond milk

The following foods contain few or no carbs and therefore don't have a GI value. These foods can be included as part of the low GI diet:

Fish and seafood: including salmon, trout, tuna, sardines, and prawns

Other animal products: including beef, chicken, pork, lamb, and eggs

Nuts: such as almonds, cashews, pistachios, walnuts, and macadamia nuts

Fats and oils: including olive oil, butter, and avocado

Herbs and spices: such as garlic, basil, dill, salt, and pepper

To search for foods not found on this list, refer to this database.

SUMMARY
The low GI diet involves swapping high GI foods for low GI alternatives. For a balanced diet, consume low GI options from each of the food groups.

Nothing is strictly banned on the low GI diet.

However, try to replace these high GI foods with low GI alternatives as much as possible:

Bread: white bread, bagels, naan, Turkish bread, French baguettes, Lebanese bread

Breakfast cereals: instant oats, Rice Krispies, Cocoa Krispies, Corn Flakes, Froot Loops

Starchy vegetables: Désirée and Red Pontiac potato varieties, instant mashed potatoes

Pasta and noodles: corn pasta and instant noodles

Rice: Jasmine, Arborio (used in risotto), Calrose, medium-grain white

Dairy replacements: rice milk and oat milk

Fruit: watermelon

Savory snacks: rice crackers, Corn Thins, rice cakes, pretzels, corn chips

Cakes and other sweets: scones, doughnuts, cupcakes, cookies, waffles, cakes

Other: jelly beans, licorice, Gatorade, Lucozade

SUMMARY
To follow the low GI diet, limit your intake of the high GI foods listed above and replace them with low GI alternatives.

This sample menu shows what 1 week on the low GI diet might look like. It even includes a few recipes from the Glycemic Index Foundation.

Feel free to adjust this or add low GI snacks based on your own needs and preferences.
Monday Tuesday Wednesday

Breakfast: omelet with mushrooms, spinach, tomato, and cheese

Lunch: salmon, ricotta, and quinoa cups with a salad

Dinner: homemade pizzas made with whole wheat bread

Thursday Friday

Breakfast: fruity quinoa porridge with apple and cinnamon

Lunch: toasted tuna salad sandwich on whole wheat bread

Dinner: chicken and chickpea curry with basmati rice

Saturday Sunday
SUMMARY
The sample meal plan above shows what 1 week on the low GI diet might look like. However, you can adjust the plan to suit your taste and dietary preferences.

If you find yourself hungry between meals, here are a few healthy low GI snack ideas:

a handful of unsalted nuts

a piece of fruit with nut butter

carrot sticks with hummus

a cup of berries or grapes served with a few cubes of cheese

Greek yogurt with sliced almonds

apple slices with almond butter or peanut butter

a hard-boiled egg

low GI leftovers from the night before

SUMMARY
Eating snacks between meals is allowed on the low GI diet. Some healthy snack ideas are listed above.

Although the low GI diet has several benefits, it also has a number of drawbacks.

First, the GI doesn't provide a complete nutritional picture. It's important to also consider the fat, protein, sugar, and fiber contents of a food, regardless of its GI.

For example, the GI of frozen french fries is 75. Some varieties of baked potato, a healthier alternative, have a GI of 93 or more.

In fact, there are many unhealthy low GI foods, such as a Twix bar (GI 44) and ice cream (GI 27-55 for low fat versions).

Another drawback is that the GI measures the effect of a single food on blood sugar levels. However, most foods are consumed as part of a larger mixed meal, making the GI difficult to predict in these circumstances ().

Lastly, as mentioned earlier, the GI doesn't take into account the number of carbs you eat. However, this is an important factor in determining their effect on your blood sugar levels.

For example, watermelon has a high GI of 72-80 and therefore wouldn't be considered the best option when following a low GI diet.

However, watermelon also has a low carb content, containing under 8 grams of carbs per 100 grams. In fact, a typical serving of watermelon has a low GL of 4-5 and a minimal effect on blood sugar levels ().

This highlights that using GI in isolation may not always be the best predictor of blood sugar levels. It's important to also consider the carb content and GL of a food.

SUMMARY
The low GI diet has its drawbacks. The GI can be difficult to calculate, it doesn't always reflect the healthiness of a food, and it doesn't take into account the number of carbs consumed.

The low glycemic (low GI) diet involves swapping high GI foods for low GI alternatives.

It has a number of potential health benefits, including reducing blood sugar levels, aiding weight loss, and lowering your risk of heart disease and type 2 diabetes.

However, the diet also has multiple drawbacks.

At the end of the day, it's important to consume a healthy, balanced diet based on a variety of whole and unprocessed foods, regardless of their GI.

Read this article in Spanish.

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Everything You Want to Know About the Low Glycemic Diet

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This eating plan comes with a host of health benefits. However, it also comes with some drawbacks. The low glycemic (low GI) diet is based on the concept of the glycemic index (GI). Studies have shown that the low GI diet may result in weight loss, reduce blood sugar levels, and lower the risk of heart disease and type 2 diabetes.

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Much of the fiber that we consume isn't digested so it does not provide many calories. This may cause short-term constipation along with bloating, cramping, and intestinal gas. This diet is also not appealing for many which can mean that more people find it hard to stick to.

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An ideal high-fiber diet should include majority fruits and vegetables with the skin/peels on if possible. Whole grains, nuts, seeds, beans, and pulses also play a fundamental role.

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What Foods Are Included in a Low-Carb Diet?

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What Foods Are Included in a Low-Carb Diet?

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Protein and fat are unrestricted in this diet, but bread, pasta, grains, and starchy vegetables are restricted. At the start of the diet, sometimes fruits and vegetables can be restricted as well.

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Limiting your intake of refined carbs can be beneficial to your health, but since this diet sometimes includes cutting out fruits and vegetables, this aspect can damage your health. The long-term consequences of this diet are not completely understood, but it can help with short-term weight loss.

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Fats and proteins provide most of the calories and energy in low-carb diets since carbohydrate intake is limited, leading to weight loss, low blood sugar and insulin levels, and burning fat more quickly.