Brenda Khan
Carbohydrates are one of the basic food groups and an essential source of energy for the body. While a low-carb diet is a popular strategy for weight loss, there is no consensus on what defines a low-carb diet. Generally, a low-carb diet involves reducing the total amount of carbohydrates consumed in a day to less than 130 grams, with some diets restricting carbohydrates to as low as 20 grams per day. The recommended daily intake of carbohydrates varies depending on factors such as age, sex, and health, with the average person advised to obtain 45 to 65% of their calories from carbohydrates. While a low-carb diet can be effective for weight loss, it may also limit the amount of fiber in one's diet and can be challenging to maintain in the long term.
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What You'll Learn
Low-carb diets are effective for weight loss
Low-carb diets have been a strategy for weight loss since 1860, and their popularity continues today. 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.
Low-carb diets are considered effective for weight loss. A review of 17 studies found that participants lost significantly more weight on a low-carb diet than on a low-fat diet. Another study found that those on a low-carb diet lost three times as much weight as those on a low-fat, calorie-restricted diet. Most studies indicate that low-carb diets are more beneficial for fat loss, particularly belly fat.
Low-carb diets are typically defined as consuming less than 26% of total daily calories from carbohydrates, or fewer than 130 grams of carbohydrates per day on a 2,000-calorie diet. Very low-carb diets involve consuming less than 10% of total daily calories from carbohydrates, or 20-50 grams of carbohydrates per day. These very low-carb diets are often ketogenic, meaning they induce ketosis, a metabolic state where the body uses fat for energy instead of carbohydrates.
To ensure a healthy low-carb diet, it is important to replace carbohydrates with whole, nutritious foods. Lean meats, fish, eggs, vegetables, and healthy fats like avocado and walnuts are recommended. It is also important to note that low-carb diets may not be suitable for everyone, and there are some safety concerns related to ketosis, cardiovascular health, lipid levels, and renal effects. Additionally, weight loss is not always linear, and there may be periods of stalls or plateaus. Consulting a healthcare professional before making any significant dietary changes is advisable.
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Nutritional ketosis and keto diets
Nutritional ketosis is a metabolic state in which the body uses fat for fuel instead of carbohydrates. Typically, the brain demands the most glucose, about 120 grams daily, as it cannot store glucose. However, when very few carbohydrates are eaten, the body begins to use fat as its primary fuel. The liver produces ketone bodies from fat, which can be used in the absence of glucose.
Ketogenic diets are very low-carbohydrate diets that share similarities with other low-carb diets such as Atkins and Paleo. The keto diet restricts carbohydrates to under 50 grams per day, which is less than the amount in a medium plain bagel. This induces glycogen depletion and ketone production by mobilizing fat stored in adipose tissue. Nutritional ketosis generally increases serum ketones from 1 mmol/L to 7 mmol/L but does not produce metabolic acidosis.
Ketogenic diets can cause significant reductions in blood sugar and insulin levels, which can have health benefits. The diet is also high in fat, with suggestions that around 70-80% of total daily calories should come from fat. This means that for a 2000-calorie diet, you would consume around 165 grams of fat, 40 grams of carbohydrates, and 75 grams of protein.
The keto diet is advertised as a weight-loss wonder, and studies have shown that it can be effective in this regard. One study of 39 obese adults placed on a ketogenic very low-calorie diet for 8 weeks found a mean loss of 13% of their starting weight and significant reductions in fat mass, insulin levels, blood pressure, and waist and hip circumferences. However, there are also several risks associated with the keto diet. The diet is high in saturated fat and is associated with an increase in "bad" LDL cholesterol, which is linked to heart disease. With so much fat to metabolize, the diet could also worsen any existing liver conditions. The kidneys help metabolize protein, and the keto diet may overload them. The diet is also low in fibrous foods, which can cause constipation. Finally, low-carb diets may cause confusion and irritability as the brain functions best when its energy source is glucose from healthy carbohydrates.
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Daily carb allowance
The amount of carbohydrates one should eat depends on factors such as age, sex, health, and weight goals. On average, people should get 45 to 65% of their calories from carbohydrates every day. This translates to 275 g of carbohydrates per day for a 2,000-calorie daily diet. However, this daily value may vary depending on an individual's calorie needs and health.
Low-carb diets have been a strategy for weight loss since 1860 and continue to be popular today. 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. For instance, a very low-carb diet typically consists of less than 10% carbohydrates or 20 to 50 grams of carbohydrates per day.
The ketogenic (keto) diet is a popular low-carb, high-fat eating pattern that restricts carbohydrates to induce nutritional ketosis. This typically involves limiting daily carb intake to less than 5-10% of total calories, or around 20-50 grams of carbs. The Atkins diet is another low-carb approach that starts with a daily carb intake of about 20 grams, gradually increasing but typically not exceeding 100 grams per day.
When following a low-carb diet, it is important to limit or avoid certain foods, such as sweet snacks, refined grains, diet and low-fat products, highly processed foods, and sugar-sweetened beverages. However, even higher-carb foods like fruits, starchy vegetables, and whole grains can be included in moderation. It is recommended to consult a doctor or dietitian to determine the appropriate carbohydrate allowance based on one's health goals and personal preferences.
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Health benefits and risks
Low-carb diets, such as the popular Paleo, South Beach, and Atkins plans, are often advertised as a weight-loss wonder. However, they are medical diets that come with certain health risks. While some studies have shown that low-carb diets are effective for weight loss, especially in obese and overweight people, others have questioned their long-term safety and sustainability.
Health Benefits
Low-carb diets have been shown to induce rapid weight loss, especially in the first few weeks. This initial weight loss is due in part to water loss, but fat loss occurs with adherence to the low-carb approach. In addition to weight loss, low-carb diets are believed to have other health benefits, such as improved blood sugar control, which is particularly beneficial for people with type 1 or 2 diabetes. Decreasing carb intake may also improve heart health by decreasing blood triglyceride levels, which are associated with an increased risk of heart disease. Some proponents of the carnivore diet, an extreme version of low-carb diets, also claim relief from autoimmune conditions and increased mental clarity.
Health Risks
The brain's primary energy source is sugar from healthy carbohydrates, so low-carb diets may cause confusion and irritability. In addition, very-low-carb diets are typically high in fat, which can lead to an increase in "bad" LDL cholesterol, linked to heart disease. The restriction of fruits and vegetables in very-low-carb diets can also result in a lack of micronutrients, including selenium, magnesium, phosphorus, and vitamins B and C. Furthermore, the long-term safety of very-low-carb diets is unclear, with concerns about ketosis, cardiovascular safety, lipid levels, and renal effects.
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Recommended foods
The recommended foods on a low-carb diet are those that are high in fibre and contain essential vitamins and minerals. It is important to note that the number of carbohydrates a person should eat varies depending on factors such as age, sex, health, and weight goals. On average, people should get 45 to 65% of their calories from carbohydrates every day.
When eating grains, opt for whole grains such as whole-wheat bread, brown rice, whole cornmeal, and oatmeal. These foods provide more nutrients than refined grains, which have been stripped of certain parts of the grain and, therefore, certain nutrients. Refined grains include white rice, white pasta, tortillas, and crackers.
If you are following a low-carb diet, it is recommended that you eat fruits, starchy vegetables, and whole grains in moderation. Starchy vegetables include potatoes, sweet potatoes, yams, peas, and corn. Higher-carb fruits include bananas, pineapples, and mangoes.
If you are following a very low-carb or keto diet, you may want to limit your intake of starchy vegetables and higher-carb fruits and focus on eating animal and plant-based proteins, as well as plenty of low-carb vegetables. Dark chocolate with at least 70% cocoa may also be a good option, as it is high in antioxidants.
It is important to note that low-carb diets can be challenging when dining out, as restaurant foods often include condiments, sauces, or side dishes that are high in added sugar or carbs. When eating out, opt for meat- or fish-based main dishes and extra vegetables or a side salad instead of bread, potatoes, or rice. Check the menu beforehand to find options that fit your daily carb allowance.
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Frequently asked questions
A low-carb diet is a strategy for weight loss that involves reducing the overall intake of carbohydrates. There is no clear consensus on what defines a low-carb diet, but it typically involves limiting daily carb intake to between 25 and 150 grams of carbohydrates or getting less than 26% of your daily calories from carbs.
If you're following a low-carb diet, you may want to limit or avoid sweet snacks, refined grains, diet and low-fat products, highly processed foods, and sugar-sweetened beverages. Instead, opt for whole grains, such as whole-wheat bread, brown rice, whole cornmeal, and oatmeal, which offer more nutrients. You should also check food labels to find options that fit into your diet.
Some popular low-carb diets include the Ketogenic (keto) diet, the Atkins diet, the South Beach diet, and the Dukan diet. The keto diet restricts carbohydrates to induce nutritional ketosis and typically limits carbs to 20 to 50 grams daily. The Atkins diet starts with a daily carb intake of about 20 grams, gradually increasing to no more than 100 grams per day. The South Beach diet encourages the consumption of lean meats and heart-healthy fats, while the Dukan diet is high in protein and low in fat, with four phases to help you reach your weight loss goals.
A low-carb diet can be effective for weight loss and may be especially beneficial for people with type 2 diabetes. However, it can also limit your fibre intake and be challenging to maintain in the long term. There are also safety concerns related to ketosis, long-term cardiovascular safety, lipid levels, and renal effects. It is important to speak to a healthcare professional before starting a low-carb diet to ensure it is safe and suitable for you.
