Milly Gaines
No-carb diets have gained popularity in recent years, with many people adopting them for weight loss or blood sugar management. This type of diet involves eliminating carbohydrates as much as possible, which means cutting out foods like grains, fruits, vegetables, milk, yogurt, pasta, and bread. Instead, those on a no-carb diet consume mostly animal products, such as meat, fish, eggs, and cheese. While reducing carb intake can aid in weight loss, no-carb diets are highly restrictive and may be unsafe in the long term. They are not recommended for certain individuals, including those with eating disorders or cholesterol issues. Additionally, no-carb diets may be low in heart-healthy fats and can foster an unhealthy relationship with food. Before embarking on a no-carb diet, it is important to consult with a healthcare professional and be aware of the potential risks and challenges associated with this extreme dietary approach.
| Characteristics | Values |
|---|---|
| Carbohydrate intake | As low as possible, but not necessarily zero |
| Macronutrients | Focus on protein and fat |
| Food groups | Meat, fish, eggs, cheese, butter, oils, water, tea, coffee, nuts, seeds, non-starchy vegetables, high-fat fruits |
| Weight loss | Likely, due to reduced calories and increased satiety |
| Blood sugar | Can help manage diabetes, but hypoglycaemia is a risk |
| Cholesterol | May increase bad cholesterol |
| Kidney function | May increase risk of kidney stones or gout |
| Heart health | May be low in heart-healthy fats |
| Eating disorders | May foster an unhealthy relationship with food |
| Sustainability | May not be sustainable long-term |
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What You'll Learn
What are carbs?
Carbohydrates, or carbs, are one of the basic food groups and are your body's primary source of energy. They are found in grains, beans, legumes, fruits, vegetables, milk, yogurt, pasta, bread, and baked goods. When you eat carbs, your body breaks them down into glucose or blood sugar, which your body's cells use for energy. Any extra glucose is stored in your muscles or liver, and any excess beyond that is converted into fat.
There are three types of carbohydrates: fiber and starches, which are complex carbs, and sugars, which are simple carbs. Complex carbohydrates take longer for your body to break down, resulting in stable blood sugar levels and a longer-lasting feeling of fullness. They also provide your body with vitamins, minerals, and fiber. Whole grains, beans and legumes, fruits, whole-grain products, and vegetables are examples of foods that contain complex carbohydrates. On the other hand, simple carbohydrates are broken down quickly by the body, leading to a rapid rise and subsequent drop in blood sugar levels. Sugary foods and drinks, refined grains, baked goods, and starchy vegetables are sources of simple carbohydrates.
The amount of carbohydrates people should consume varies depending on factors such as age, sex, health status, and weight goals. On average, it is recommended that people obtain 45 to 65% of their calories from carbohydrates daily. However, there is no one-size-fits-all approach, and the recommended amount can differ based on individual needs. For example, some people may choose to follow a low-carb diet, typically consuming between 25 to 150 grams of carbs per day, to facilitate weight loss.
While a no-carb diet eliminates digestible carbs, it is important to note that carbohydrates are a significant source of energy for the body. Before embarking on a highly restrictive diet like this, it is advisable to consult a healthcare professional to understand the potential benefits and risks.
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What is a no-carb diet?
A no-carb diet is a way of eating that eliminates digestible carbohydrates as much as possible. Carbohydrates are the body's primary source of energy and are found in grains, beans, legumes, fruits, vegetables, milk, yogurt, pasta, bread, and baked goods. Therefore, a no-carb diet consists of foods that contain primarily protein or fat, such as meats, fish, eggs, cheese, oils, and butter.
There is no strict rule book for a no-carb diet. Some people who follow it eat nuts and seeds, non-starchy vegetables, and high-fat fruits like avocado and coconut. Even though these foods have some carbs, they’re high in fiber. Therefore, they have only a minuscule number of digestible or net carbs, which is calculated by subtracting the amount of fiber from the total number of carbs. A no-carb diet resembles a ketogenic diet, which also limits carb intake.
Since the no-carb diet focuses on restricting a specific macronutrient, there are no recommendations for daily calorie intake or portion sizes. In general, reducing your carb intake can help you lose weight. Replacing carbs with primarily more protein, fiber, and fat may help you feel more full and eat fewer overall calories, which in turn promotes weight loss. However, very low-carb diets are also high-fat, and your saturated fat intake should be no more than 5% to 6% of your total.
No-carb diets are highly restrictive, very high in fat, and not well-researched for safety. As such, they are not appropriate for those with eating disorders, children, cholesterol hyper-responders, and pregnant or nursing people. Research suggests that eating only animal proteins causes few negative side effects, though some people did develop higher Low-density lipoproteins (LDL) or bad cholesterol levels. Additionally, a no-carb diet may not provide enough vitamins and minerals, such as potassium, B vitamins, and vitamin C, which are abundant in fruits, vegetables, and other plant foods.
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What are the potential health risks?
A no-carb diet is a highly restrictive diet that eliminates carbohydrates as much as possible. Carbohydrates are the body's primary source of energy and are found in grains, beans, legumes, fruits, vegetables, milk, yogurt, pasta, bread, and baked goods. Therefore, a no-carb diet consists mostly of animal products, such as meats, fish, eggs, cheese, oils, and butter. While a no-carb diet may aid in weight loss, it also comes with potential health risks.
Firstly, a no-carb diet may be deficient in heart-healthy fats like monounsaturated fats, which are associated with a lower risk of heart disease. Unsaturated fats, including omega-3 fats, are primarily found in plants like nuts, seeds, olives, and avocados. By limiting plant-based foods, a no-carb diet may negatively impact heart health.
Secondly, a no-carb diet can lead to higher Low-density lipoprotein (LDL) levels, or "bad" cholesterol. Research suggests that a diet consisting only of animal proteins can cause an increase in LDL cholesterol levels, which can have adverse effects on cardiovascular health.
Thirdly, a no-carb diet may negatively impact kidney health. Nutritional ketosis, a state often associated with low-carb diets, can increase uric acid levels, leading to kidney stones or gout flares. Additionally, diets high in red meat and low in whole grains, low-fat dairy, and fruit are linked to a higher risk of kidney disease.
Furthermore, a no-carb diet may foster an unhealthy relationship with food and contribute to disordered eating. Restrictive diets can trigger or exacerbate existing eating disorders, which are among the mental health diagnoses with the highest mortality rates.
Lastly, a no-carb diet may not be necessary for improving insulin resistance or managing blood sugar. Healthcare providers typically recommend a moderate carbohydrate intake at predictable time intervals, increased fiber consumption, and a balanced intake of macronutrients (carbohydrates, protein, and fat). Eliminating all carbohydrates is not essential for blood sugar management and may deprive the body of essential nutrients.
In conclusion, while a no-carb diet may lead to weight loss, it poses potential health risks, including negative impacts on heart health, kidney function, and nutritional adequacy. It may also contribute to disordered eating behaviours. It is always advisable to consult with a healthcare professional before starting any restrictive diet to ensure it is safe and appropriate for your individual needs.
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What are the benefits?
While there are no studies on diets that completely eliminate carbs, research on very low-carb diets suggests several potential benefits.
Firstly, decreasing your carb intake may improve heart health. Very low-carb diets have been shown to decrease blood triglyceride levels, which are linked to an increased risk of heart disease. However, more research is needed to fully understand the impact on cardiovascular health, as some studies have associated low-carb diets with higher levels of "bad" cholesterol.
Secondly, a no-carb diet may aid weight loss. Studies indicate that cutting carbs can reduce appetite and calorie intake, leading to more short-term weight loss compared to low-fat diets. This is partly due to the reduction of excess water in the body, which causes a rapid decrease in weight during the first week. Over time, fat loss can also occur.
Thirdly, a no-carb diet may help manage blood sugar levels. Cutting carbs, particularly refined carbs and sugar, can improve blood sugar control, which is beneficial for those with diabetes.
Finally, a no-carb diet may reduce the risk of metabolic syndrome, a group of risk factors that increase the likelihood of heart disease, diabetes, and stroke. Very low-carb diets are associated with a lower chance of developing this syndrome.
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What foods can you eat?
A no-carb diet is highly restrictive, and some sources say it is unnecessary and not advisable. Carbohydrates are one of the three main food types the body needs to work properly, and they are the body's primary source of energy. Therefore, a no-carb diet is likely to be challenging to follow.
If you are intent on following a no-carb diet, you should consult a registered dietitian nutritionist for a balanced and sustainable weight-loss plan. You should also ensure you are getting all the necessary nutrients. Some research suggests that eating only animal proteins may cause higher LDL (bad cholesterol) levels.
On a no-carb diet, you can eat foods that contain primarily protein or fat, such as:
- Meat, including beef, chicken, and lamb
- Fish
- Eggs
- Certain dairy products, such as cheese, butter, and certain oils
Some people on a no-carb diet also eat nuts and seeds, non-starchy vegetables, and high-fat fruits like avocado and coconut, as these foods are low in net carbs.
You should avoid most fruits and vegetables, grains, beans, legumes, pasta, bread, baked goods, milk, yogurt, and starchy vegetables like peas and corn.
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Frequently asked questions
A no-carb diet is an eating plan that eliminates carbohydrates as much as possible. Carbohydrates are the body's primary source of energy and are found in grains, beans, legumes, fruits, vegetables, milk, yogurt, pasta, bread, and baked goods.
A no-carb diet can help with weight loss and may be beneficial for managing blood sugar levels in people with diabetes. It can also reduce cravings and appetite due to the high protein and fat content.
No-carb diets are highly restrictive and may lead to an unhealthy relationship with food. They can be low in heart-healthy fats and important nutrients found in plant-based foods. There is limited research on the long-term health consequences, and it may increase the risk of kidney stones or gout flares.
Foods allowed on a no-carb diet include meat, fish, eggs, cheese, butter, oils, nuts, seeds, and non-starchy vegetables. Some people also include high-fat fruits like avocado and coconut, as well as no-calorie beverages like water, coffee, and tea.
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