Madeleine Hull
Carbohydrates are one of the three macronutrients that the body needs to function properly. They are a basic nutrient that the body turns into glucose or blood sugar, which provides energy. While decreasing your carb intake can help you lose weight, completely eliminating carbs is highly restrictive and most likely unnecessary. Some downsides of a no-carb diet include a lack of fiber, which can cause constipation, and an increase in LDL or bad cholesterol. Nutritional ketosis, which is triggered by a very low-carb diet, may also cause side effects such as weakness, fatigue, dizziness, and headaches. Additionally, avoiding an entire food group can be difficult to sustain long-term, and may result in a diet lacking in phytochemicals, which offer cancer-protective factors.
Characteristics and Values Table for Eliminating Carbs from Diet
| Characteristics | Values |
|---|---|
| Weight Loss | Eliminating carbs can help with weight loss, especially belly fat, as it reduces overall calorie intake and forces the body to burn stored fat for energy. |
| Energy Levels | Cutting out carbs can lead to increased energy levels by avoiding the energy spikes and crashes associated with simple carbs. |
| Blood Sugar Control | Decreasing carb intake can aid in blood sugar control, which is beneficial for people with diabetes. However, very low-carb diets can also lead to hypoglycemia, where blood sugar dips too low. |
| Cardiovascular Health | Lowering carb intake may improve heart health by decreasing blood triglyceride levels, which are linked to an increased risk of heart disease. However, very low-carb diets may also lead to an increase in LDL ("bad") cholesterol. |
| Nutritional Concerns | Eliminating carbs can result in nutritional deficiencies, especially if not properly planned. It may lead to lower serotonin levels, which are important for guarding against anxiety and depression. It can also be low in fiber, leading to constipation. |
| Kidney Health | Nutritional ketosis, a state induced by very low-carb diets, can increase uric acid levels, potentially causing kidney stones or gout. Studies suggest that diets high in red meat and low in whole grains are linked to a higher risk of kidney disease. |
| Restrictive Nature | Avoiding carbs is highly restrictive and may be difficult to sustain long-term. It can also lead to a decrease in phytochemicals, which have cancer-protective factors. |
| Brain Function | Sharp reductions in healthy carbs can impact brain function, potentially causing "brain fog" and affecting sleep. |
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What You'll Learn
- Nutritional ketosis may increase uric acid levels, causing kidney stones or gout
- Low-carb diets can lead to constipation due to a lack of fibre
- Carbohydrates are essential for human health and function
- Restricting carbs may lead to increased mortality and higher LDL cholesterol
- Carbohydrates are the body's primary source of energy
Nutritional ketosis may increase uric acid levels, causing kidney stones or gout
Nutritional ketosis is a metabolic state induced by very low-carb diets, where the body burns fat for energy instead of carbohydrates. While ketosis can aid weight loss and improve cardiovascular health, it may also increase uric acid levels in the body.
Uric acid is a chemical compound that forms when the body breaks down purines—organic compounds found in human cells and certain foods, including red meat, organ meats, and seafood. Normally, uric acid is dissolved in the blood and passed through the kidneys to be excreted as urine. However, when uric acid levels rise, it can lead to the formation of kidney stones or gout.
Kidney stones occur when uric acid or other substances crystallize in the kidneys or urinary tract, causing intense pain and potentially blocking the flow of urine. Gout, on the other hand, is a form of inflammatory arthritis triggered by high uric acid levels. It typically affects the joints, especially those in the feet and hands, causing sudden and severe pain, swelling, and stiffness.
The exact mechanism by which nutritional ketosis increases uric acid levels is not fully understood. However, it is speculated that the rapid breakdown of fat and protein may contribute to this effect. Additionally, the keto diet's restriction of certain foods, such as whole grains, low-fat dairy, and fruits, may further impact uric acid levels and increase the risk of kidney disease.
To mitigate these risks, it is essential to closely monitor uric acid levels and kidney function while on a ketogenic diet. Consulting with a healthcare professional is crucial, especially for individuals with a history of kidney issues or gout. Adjustments to the diet, such as including more uric acid-lowering foods (e.g., cherries, citrus fruits, and dairy) and ensuring adequate hydration, may help reduce the risk of kidney stone formation and gout attacks.
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Low-carb diets can lead to constipation due to a lack of fibre
Eliminating carbohydrates from your diet can have several downsides. One of the most common side effects of a low-carb diet is constipation, which can be caused by a lack of fibre.
Constipation is an uncomfortable decrease in bowel movements, defined by the American College of Gastroenterology as having fewer than three bowel movements per week. The keto diet, a very low-carb, high-fat, moderate-protein eating pattern, can lead to constipation as your body adjusts to burning fat instead of glucose for energy. This transition can cause digestive issues, and the high-fat content may also contribute to gastrointestinal upset.
Low-carb diets are often low in fibre, which is essential for maintaining healthy bowel movements. Carbohydrates like fruits, whole grains, and starchy vegetables are common sources of fibre, and restricting these foods can lead to a sudden decrease in fibre intake, resulting in constipation. Additionally, the keto diet restricts or significantly limits fruits, beans, vegetables, and whole grains, which may lead to a lack of nutrients and further contribute to constipation.
To prevent constipation on a low-carb diet, it is important to ensure adequate fibre intake. This can be achieved by consuming keto-friendly, high-fibre foods such as non-starchy vegetables (e.g., greens, broccoli, asparagus, and cauliflower), low-carb fruits (e.g., berries and citrus fruits), and nuts and seeds, which are also rich in essential vitamins and minerals. Staying properly hydrated by drinking enough water is also crucial for regular bowel function.
While constipation due to a low-carb diet usually resolves over time or with home remedies, it is important to seek medical advice if it persists or leads to complications such as abdominal pain, anal fissures, or haemorrhoids.
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Carbohydrates are essential for human health and function
Carbohydrates are one of the three macronutrients essential to the human body, the other two being proteins and fats. The body needs carbohydrates in large amounts, and they are crucial for proper body functioning. According to the 2020-2025 Dietary Guidelines for Americans, healthy adults should derive 45% to 65% of their daily caloric intake from carbohydrates.
Carbohydrates are a basic nutrient that the body turns into glucose, or blood sugar, to make energy for the body to function. The body stores glucose in the form of glycogen, which helps the body retain water. When you cut down on carbs, you lose water weight, and there is a risk of dehydration.
Carbs are found in grains, beans, legumes, fruits, vegetables, milk, yogurt, pasta, bread, and baked goods. Whole grains, fruits, and vegetables are healthier sources of carbohydrates than sugary drinks, candies, and baked goods. A low-carb diet may help with weight loss, but it can also lead to nutritional deficiencies, including a lack of fibre, which can cause constipation.
Extremely low-carb diets can lead to ketosis, which can cause weakness, fatigue, dizziness, and headaches. In addition, ketosis can cause hypoglycaemia, or low blood sugar, which can be dangerous, especially for people with diabetes. Nutritional ketosis may also increase uric acid levels, leading to kidney stones or gout.
Therefore, while reducing the intake of unhealthy, refined carbohydrates can have health benefits, completely eliminating carbs is highly restrictive and unnecessary. Carbohydrates are essential for human health and function, and a balanced diet that includes healthy sources of carbohydrates is ideal for maintaining overall health.
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Restricting carbs may lead to increased mortality and higher LDL cholesterol
Restricting carbohydrates from your diet may have adverse effects on your health. One of the most significant concerns is the potential impact on your cholesterol levels, specifically leading to an increase in low-density lipoprotein (LDL) cholesterol, commonly known as "bad" cholesterol. This type of cholesterol is a well-known risk factor for atherosclerotic cardiovascular disease (ASCVD), which is the leading cause of mortality in the United States and the developed world.
Several studies have found a link between low-carb diets and increased LDL cholesterol levels. While some clinical trials show marked LDL cholesterol elevation soon after starting a low-carb diet, the underlying reason for this relationship is not yet fully understood. One hypothesis suggests that carbohydrate restriction increases reliance on systemic triglyceride trafficking, leading to increased hepatic VLDL production and subsequent peripheral turnover, resulting in higher levels of apolipoprotein B lineage lipoproteins, including LDL.
The impact of low-carb diets on LDL cholesterol may depend on individual factors, such as body mass index (BMI). Some studies indicate that individuals with a lower BMI are more likely to experience a substantial increase in LDL cholesterol when following a low-carb diet. This phenomenon has been attributed to the "lean mass hyper-responder" (LMHR) phenotype, which warrants further research. Additionally, the quality of the diet also seems to matter; healthy low-carb diets are associated with lower mortality, while unhealthy low-carb diets are linked to higher mortality rates.
The potential consequences of elevated LDL cholesterol levels due to carbohydrate restriction are severe. Atherosclerosis, the buildup of plaque in the arteries, is a significant concern. While some studies suggest that carbohydrate restriction-induced elevations in LDL-cholesterol may not directly lead to increased atherosclerotic plaque burden, more research is needed to understand the long-term effects. Given the established link between LDL-cholesterol and ASCVD, it is crucial to carefully consider the potential impact on cardiovascular health before significantly restricting carbohydrates from your diet.
It is important to note that not all effects of low-carb diets are negative. Some metabolic markers, such as lowering triglycerides and increasing HDL ("good") cholesterol, have been shown to improve with these diets. Additionally, low-carb diets can be beneficial for individuals with specific health goals or conditions, such as weight loss or improving glycemic control for diabetes. However, it is always advisable to consult with a healthcare professional or dietitian before making significant dietary changes, especially if you have any pre-existing health conditions.
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Carbohydrates are the body's primary source of energy
Carbohydrates are one of the three macronutrients that the body needs, along with protein and fat. They are the body's primary source of energy, and healthy adults should consume 45% to 65% of their daily caloric intake from carbohydrates, according to the 2020-2025 Dietary Guidelines for Americans. Carbohydrates are made up of sugars, starches, and fibres. Sugars provide sweetness and improve the taste, texture, and colour of food. Starches are made up of many sugar molecules linked together and can be broken down into glucose, which can be used immediately for energy or stored for later as glycogen. Fibre is another type of carb that is not digestible but can be fermented in the colon or pass through the digestive system, absorbing water and adding bulk to the stool.
Carbohydrates are found in grains, beans, legumes, fruits, vegetables, milk, yogurt, pasta, bread, and baked goods. When carbohydrates are restricted or eliminated from the diet, it can lead to weight loss, as the body starts to burn fat for energy instead of using glucose from carbohydrates. However, this weight loss is mostly water weight at first, as cutting carbs also wipes out the glycogen stores in the body, which help retain water.
Extremely low-carb diets, such as the keto diet, can have several downsides. One of the main risks is nutritional ketosis, which can lead to side effects such as weakness, fatigue, dizziness, and headaches. Nutritional ketosis can also cause an increase in uric acid levels, leading to kidney stones or gout flares. In addition, low-carb diets are typically also low in fibre, which can lead to constipation.
Additionally, some studies have linked low-carb diets to an increase in "bad" LDL cholesterol, which is associated with a higher risk of heart disease. Furthermore, avoiding an entire food group, such as carbohydrates, is highly restrictive and can be challenging to sustain long-term. It can also lead to a decrease in overall nutrient intake, as many nutrient-dense foods, such as fruits, vegetables, and whole grains, contain carbohydrates. Therefore, it is important to consult a healthcare professional or dietitian before starting a low-carb or no-carb diet to ensure that it is safe and that all necessary nutrients are being obtained.
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Frequently asked questions
Carbohydrates are one of the three macronutrients the body needs, so eliminating them from your diet can be unhealthy. Some of the possible downsides include:
- Weight loss that is mostly water weight at first.
- Nutritional ketosis, which can lead to weakness, fatigue, dizziness, and headaches.
- Low blood sugar levels, which can be dangerous if you have diabetes.
- A decrease in serotonin levels, which can increase anxiety and depression.
- Kidney damage, osteoporosis, and impaired physical activity.
Carbohydrates are made up of sugars, starches, and fibers. They are the body's primary source of energy and are found in grains, beans, legumes, fruits, vegetables, milk, yogurt, pasta, bread, and baked goods. People cut carbs from their diets because it is a popular way to lose weight, and it can also help lower the risk of diabetes and metabolic syndrome.
Some easy ways to cut carbs from your diet include:
- Eliminating sugary beverages and replacing them with water or unsweetened drinks.
- Ordering meals "protein style" or without the bun/bread.
- Removing packaged snacks such as crackers and biscuits from your diet.
- Cutting out baked goods like cookies and muffins.
