Brenda Khan
Carbohydrates, fat, and protein are macronutrients that contribute to the body's energy needs. The recommended dietary allowance of carbohydrates for adults and children is 45% to 65% of their total calories, which equates to approximately 130g/day. The specific percentage of carbohydrates in one's diet may vary depending on factors such as weight loss goals, age, sex, body type, and activity level. Restricting carbohydrates for short periods is generally not harmful, and low-carb diets have been associated with various health benefits, including weight loss, lower blood sugar, and reduced blood pressure. However, severely restricting carbohydrates for long periods may be less beneficial than a more balanced approach, and low-carb diets may increase the risk of high cholesterol.
| Characteristics | Values |
|---|---|
| Percentage of carbohydrates in a low-carb diet | ><10% to ><26% |
| Percentage of carbohydrates in a diet recommended by the Institute of Medicine | 45% to 65% |
| Percentage of carbohydrates in a diet recommended by Dietary Reference Intakes | 45% to 65% |
| Percentage of carbohydrates in a typical Korean diet | >66% |
| Percentage of carbohydrates in a diet associated with minimal risk of all-cause mortality in Koreans | 50% to 60% |
| Percentage of carbohydrates in a diet associated with higher mortality risk in a 2017 study across 18 countries | ≥60% |
| Carbohydrate sources to be restricted in a low-carb diet | Refined wheat, added sugars, refined carbohydrates (sugar, white flour, highly processed foods) |
| Healthy carbohydrate sources | Whole, unprocessed foods, high-fiber carbs like vegetables, fruits, legumes, whole grains, unrefined starch sources (potatoes, sweet potatoes, oats, brown rice) |
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What You'll Learn
Low-carb diets are a popular strategy for weight loss
The Institute of Medicine proposes that Americans obtain 45-65% of their calories from carbohydrates. However, some studies have shown that low-carb diets, comprising less than 26% of carbohydrates, can be effective for weight loss. These diets may also provide additional health benefits, such as lowering blood sugar and blood pressure, which can be particularly helpful for people with diabetes.
When adopting a low-carb diet, it is important to focus on consuming quality foods. This includes high-fibre carbs found in vegetables, fruits, legumes, and whole grains. Restricting carbohydrates from refined wheat, added sugars, and highly processed foods is recommended. However, it is crucial to ensure adequate nutrient intake and not solely focus on reducing carb portions.
The effectiveness of low-carb diets may vary depending on individual factors such as age, sex, body type, and activity level. While low-carb diets can be beneficial for weight loss and improving certain health conditions, they may not be suitable for everyone. Some studies have suggested a potential link between low-carbohydrate diets and increased mortality risk. Therefore, it is always advisable to consult with a healthcare professional before making significant dietary changes.
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The Institute of Medicine proposes 45-65% of calories from carbs
The Institute of Medicine proposes that 45-65% of an individual's diet should consist of carbohydrates. This proposition is supported by various studies and dietary patterns.
Firstly, it is important to understand that carbohydrates are one of three macronutrients, the other two being fat and protein. These macronutrients are essential to meeting the body's energy needs. Restricting carbohydrates for short periods is not harmful to most people, but it is important to ensure adequate nutrient intake by replacing them with other quality foods.
Secondly, the proposed carbohydrate intake of 45-65% is in line with dietary reference intakes, which suggest adults obtain 45-65% of their total calories from carbohydrates, 20-35% from fat, and 10-35% from protein. These proportions provide flexibility to accommodate individuals' unique needs and preferences.
Furthermore, the Institute of Medicine's recommendation aligns with the Dietary Guidelines for Americans, which also suggest a similar carbohydrate intake for those not aiming for weight loss. For individuals seeking weight loss, a low-carbohydrate diet may be beneficial, as it can reduce appetite and calorie intake, but it should still be based on whole, unprocessed foods and healthy carb sources like vegetables, fruits, legumes, and whole grains.
Finally, while the Institute of Medicine's proposal focuses on the percentage of carbohydrates, it is also essential to consider the quality of carbohydrates. Unrefined carbohydrates high in dietary fibre have a low glycemic index (GI), which can benefit individuals with type 2 diabetes by helping to maintain balanced blood glucose and insulin levels. In contrast, highly processed foods with added sugars and refined wheat are often associated with unhealthy outcomes.
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Restrict refined carbs like sugar and white flour
Carbohydrates are one of the body's main sources of energy. Health organizations such as the U.S. Department of Health and Human Services recommend that 45 to 65 percent of daily calories should come from carbohydrates. However, the majority of these should be from complex, unrefined carbs rather than refined carbs. Unlike complex carbohydrates, refined carbs are digested quickly and can cause unhealthy spikes in blood sugar levels.
Refined or simple carbs are often referred to as "bad" carbs. They are low in fiber, vitamins, and minerals and are linked to weight gain and several serious diseases. They are typically found in white bread, white flour, rice cakes, pizza dough, pasta, pastries, sweet desserts, breakfast cereals, and many other highly processed foods.
The body digests refined carbohydrates quickly, providing a rapid source of energy. However, this can lead to a quick rise in blood sugar, triggering the pancreas to release insulin. Refined carbs are also missing important nutrients, providing little to no fiber. As a result, they do not provide lasting energy, and eating too many may lead to health issues.
To restrict refined carbs, it is recommended to make gradual changes and choose healthier alternatives. For example, instead of white rice or bread, opt for brown rice or whole-grain bread. Eat fruit when craving something sweet, and avoid adding sugar to food as it does not boost its nutritional value. Checking food labels is crucial, as manufacturers use various names for refined sugars.
In summary, restricting refined carbs like sugar and white flour is essential for maintaining a healthy diet. By making healthy swaps and gradually reducing refined carb intake, individuals can improve their overall well-being and lower the risk of associated health problems.
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High-carb diets may cause excess water retention
The Institute of Medicine proposes that Americans obtain 45% to 65% of their calories from carbohydrates. However, high-carb diets may cause excess water retention. This is because for every gram of carbohydrate consumed and kept by the body for energy, the body stores 3 to 4 grams of water. This is known as water weight, which can make a person's weight fluctuate by as much as 1 to 5 pounds in a single day.
High insulin levels, caused by a high-carb diet, may cause the kidneys to retain water and sodium, leading to water weight gain. Water weight is rarely a cause for concern, but it can be a symptom of a more serious underlying condition. For example, fluid retention could be a sign of thyroid issues, or a liver or heart problem.
To reduce water weight, it is recommended to reduce sodium and carbohydrate intake, increase water consumption, and exercise. Staying hydrated ensures the body doesn't hoard water, and exercise makes the body sweat out excess water. In addition, vitamin supplements such as vitamin B-6, calcium, and magnesium can be effective remedies for fluid retention.
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Low-carb diets may help lower blood sugar and blood pressure
Low-carb diets have been a popular strategy for weight loss since 1860, and more recently in 1972. While there is no clear consensus on what defines a low-carb diet, studies have defined it as a percentage of daily macronutrient intake or total daily carbohydrate load. A very low-carbohydrate diet typically consists of less than 10% carbohydrates, while a low-carbohydrate diet consists of less than 26% carbohydrates.
Reducing carbohydrate intake can help lower blood sugar levels, especially in individuals with prediabetes or type 2 diabetes. A recent study found that a low-carb diet led to a significant reduction in A1C levels, indicating improved blood sugar control. This reduction in blood sugar may be attributed to decreased insulin resistance, as lower carbohydrate intake reduces the burden on the pancreas to produce insulin. Additionally, losing fat helps reduce insulin resistance, allowing the body to respond more effectively to insulin.
However, it is important to note that a low-carb diet may not be realistic or sustainable for everyone. Restricting carbohydrates for short periods is generally not harmful, but a well-balanced diet that includes whole grains, vegetables, fruits, beans, and lentils is recommended to ensure adequate dietary fibre intake. Additionally, it is crucial to prioritize nutritional quality when choosing carbohydrate sources. Highly processed products and empty-calorie foods should be avoided, as they offer little nutritional value and can negatively impact blood sugar control.
Low-carb diets may also help lower blood pressure by addressing how the body handles sugar and salt. A low-carb diet encourages the elimination of excess salt through urination, which can contribute to lowering blood pressure. Additionally, a diet lower in carbohydrates often includes a higher proportion of proteins and healthy fats, which can have a positive impact on blood pressure.
Overall, while low-carb diets may offer benefits in terms of blood sugar and blood pressure control, it is important to consult with a healthcare provider or registered dietitian to determine an individualized and sustainable approach to carbohydrate intake.
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Frequently asked questions
The recommended percentage of carbs in a person's diet depends on various factors, such as age, sex, body type, and activity level. However, according to the Dietary Guidelines for Americans, it is suggested that carbohydrates should make up between 45% and 65% of total calories for adults.
A low-carb diet generally refers to a diet with less than 26% of total calories coming from carbohydrates, which is less than 130g of carbohydrates per day.
Low-carb diets are often used for weight loss, but they also have additional health benefits. They can help lower blood sugar, which is beneficial for people with diabetes, and can also reduce blood pressure.
It is important to focus on whole, unprocessed foods and healthy carb sources. This includes high-fiber carbs such as vegetables, fruits, legumes, and whole grains.
Restricting carbohydrates for long periods can be challenging to maintain and may not be as beneficial as a more balanced diet. Additionally, low-carb diets may increase cholesterol, and women who are pregnant or planning to become pregnant should be cautious about restricting carbohydrates.
