Brenda Khan
Carbohydrates are an essential macronutrient that provides fuel for daily activity and functioning. Cutting carbs from your diet may promote weight loss, improve heart health, and aid blood sugar control. However, it may also lead to constipation, nutrient deficiencies, and fatigue. Some research suggests that avoiding an entire food group is extremely restrictive and unsustainable in the long term. Furthermore, low-carb diets may increase bad cholesterol and have been linked to more serious complications like kidney damage and osteoporosis. Therefore, while reducing carb intake may have some benefits, it is generally not recommended to cut carbs entirely without medical supervision.
Should I cut carbs from my diet?
| Characteristics | Values |
|---|---|
| Weight loss | Cutting carbs can promote weight loss, especially belly fat, without causing excess hunger. |
| Health complications | Low-carb diets can lead to constipation, trapped gas, stomach pain, nausea, and vomiting. More serious complications include kidney damage, osteoporosis, and impaired physical activity. |
| Energy levels | Carbohydrates are an essential macronutrient that provides fuel for daily activity. Cutting carbs may lead to decreased energy levels, fatigue, and difficulty concentrating. |
| Nutrition | Carbohydrates are a source of fiber, starch, and water. Cutting carbs may result in insufficient nutrients, including vitamins, minerals, and phytochemicals. |
| Heart health | Decreasing carb intake may improve heart health and blood sugar control by decreasing blood triglyceride levels. |
| Dietary considerations | Carbohydrates should not be completely cut out of a healthy diet. Instead, focus on reducing processed carbohydrates and increasing whole grains, fruits, and vegetables. |
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What You'll Learn
Weight loss
Carbohydrates have gained a reputation for causing weight gain, and low-carb diets have become increasingly popular. However, the relationship between carbohydrates and weight gain is more complex than simply eliminating carbs from your diet. Carbohydrates are one of three macronutrients, the other two being protein and fat. They are a crucial source of energy, especially for brain function, and can be beneficial for maintaining a healthy weight.
Simple carbs, derived from highly processed foods, do not provide additional nutrients and can cause a rapid spike in blood sugar and insulin levels, leading to increased hunger and potential weight gain. These include sugary drinks and desserts, white bread, potatoes, and white rice. On the other hand, complex carbs take longer to digest and provide a more gradual release of energy. Examples of nutrient-dense complex carbs include whole grains, fruits, vegetables, beans, and legumes.
Low-carb diets can promote weight loss, especially for people with higher body weights. A sudden reduction in carb intake can lead to initial weight loss, mostly due to the loss of water weight and the depletion of glycogen stores in the muscles. However, it takes about 2-3 weeks for the body to enter ketosis, a state where it starts burning fat for energy. While ketosis can lead to weight loss, it may also cause side effects like weakness, fatigue, dizziness, and headaches.
Instead of drastically cutting carbs, a more sustainable approach is to focus on reducing processed carbohydrates and increasing protein and healthy fat intake. Protein helps increase satiety, making you feel fuller for longer and potentially reducing overall calorie intake. Additionally, complex carbohydrates provide a more sustained release of energy and can help maintain a healthy weight when consumed in moderation.
It is important to note that individual health parameters vary, and consulting with a healthcare professional or dietitian is recommended before making significant dietary changes. While reducing carb intake may be beneficial for weight loss, it should be done as part of a balanced and sustainable diet that includes a variety of nutrient-dense foods.
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Health complications
Carbohydrates are an essential macronutrient, and it is generally not recommended that healthy adults cut them out of their diets entirely. Carbohydrates provide most of the fuel for daily activity and functioning, so you may feel more tired and hungry and find concentrating more difficult if you cut down on them. Your brain may also be affected as it prefers glucose, which is supplied by carbohydrates.
A no-carb diet may also lead to insufficient nutrients, as it 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. In addition, the increased urination that results from restricting carbs may lead to nutrient deficiencies such as sodium and potassium over time.
Low-carb diets are also low in fiber, which can lead to constipation and trapped gas in the digestive tract. A sudden lack of carbs will also make you lose weight, but it is mostly water weight at first. This is because cutting carbs wipes out the glycogen stores in your muscles, and glycogen helps your body retain water.
Some population studies have linked low-carb diets to increased mortality. Other research suggests that low-carb diets may increase LDL ("bad cholesterol") in some people, possibly due to the lack of fiber in these diets. Other complications that have been linked to long-term low-carb diets include kidney damage, osteoporosis, and impaired physical activity.
It is important to note that the quality of carb-containing foods in your diet is more important than their quantity. Choose whole grains, fruits, and vegetables over sugary drinks, candies, and baked goods.
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Nutritional deficiencies
Carbohydrates are an essential macronutrient, and it is generally not recommended that healthy adults cut them out of their diets entirely. Carbohydrates provide most of the fuel for daily activity and functioning, so you will probably have less energy if you stop eating them. You may feel more tired, hungry, and sluggish, and find concentrating more difficult.
Carbohydrates are rich in starch, fiber, and water. If you stop eating carbs, you may find it challenging to eat the recommended amounts of fiber, which can lead to constipation and other digestive issues. Fiber helps add bulk to the stool and absorb water in the colon, making it easier to pass. A low-carb diet can also lower your blood sugar levels, which can lead to weakness, fatigue, dizziness, and headaches.
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. Additionally, the increased urination that results from restricting carbs may lead to nutrient deficiencies such as sodium and potassium over time. Some population studies have linked low-carb diets to increased mortality, kidney damage, osteoporosis, and impaired physical activity.
According to a 2020 review published in Nutrition Reviews, the quality of carb-rich foods in your diet is more important than their quantity. In other words, choose whole grains, fruits, and vegetables over sugary drinks, candies, and baked goods. The U.S. government's guidelines recommend that at least half of your grains are whole grains.
It is important to note that cutting back on carbohydrates may be beneficial for some people, especially those with type 2 diabetes or significant weight issues. A diet lower in carbohydrates can promote weight loss and improve associated risks. However, it is generally recommended to reduce processed carbohydrates, such as sugary drinks, desserts, white bread, potatoes, and white rice, rather than cutting out all carbs.
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Energy levels
Carbohydrates are a basic nutrient that the body turns into glucose, or blood sugar, to make energy for the body to work. The brain uses about 20% of the energy created from carbohydrates. Carbohydrates enable the brain to produce serotonin, which plays a role in mood regulation, sleep cycle and cognition. When you don't have enough carbs in your diet, you may feel grumpy and have difficulty with functions like attention, memory and thinking.
Simple and complex carbohydrates provide the body with energy. Complex carbohydrates, such as whole grains, legumes, starchy vegetables and high-fibre fruits, provide a higher nutritional value due to the presence of vitamins, minerals and fibre. Simple carbohydrates, such as donuts, white bread and flavoured coffee drinks, are quickly digested, causing a quick spike and then decline in blood sugar. This can cause you to feel hungrier quicker, which can lead to taking in more calories than your body needs.
A very low-carb diet can lead to ketosis, where the liver starts to make ketones, an alternative energy source to glucose, by breaking down fat. Ketosis can lead to weakness, fatigue, dizziness and headaches. Nutritional ketosis may also increase uric acid levels, leading to kidney stones or gout flares.
A low-carb diet may help lower insulin levels, which can be useful for diabetics. Studies show that a very-low-carb diet can lead to stable blood sugar values for people with type 2 diabetes. However, in true ketosis, hypoglycaemia is a risk, where blood sugar levels dip too low.
While a low-carb diet may promote weight loss, it can also be detrimental to your health. Carbohydrates are an essential macronutrient, and the body's preferred source of energy. If you cut out carbs, you may feel more tired and hungry, and find concentrating more difficult.
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Diet alternatives
Cutting out carbohydrates from your diet can have several negative side effects. Firstly, it can lead to constipation due to the low fibre content of such diets. It can also cause gas to get trapped in your digestive tract, resulting in a bloated and painful stomach. Low-carb diets can also cause a decrease in blood sugar levels, which can make you feel tired, hungry, and less able to concentrate. In addition, ketosis, a common effect of low-carb diets, can lead to weakness, fatigue, dizziness, and headaches.
Therefore, rather than cutting out carbs, it is recommended to reduce the intake of processed carbohydrates. This includes sugary drinks and desserts, white bread, potatoes, and white rice. Instead, opt for whole grains, fruits, legumes, and the occasional sweet treat. A good rule of thumb is to ensure that at least half of your grains are whole grains.
If your goal is to lose weight, it is important to make sustainable changes that suit your lifestyle. Instead of grazing, which can lead to increased calorie intake, it is recommended to eat mini-meals every two to three hours, limiting each to 200-300 calories. Adding more fresh fruits and vegetables to your meals is a great way to improve your diet.
Fat is also an important component of every meal, as it helps you stay full for longer. Choose healthier fats, such as unsaturated fats from plant sources like nuts, seeds, and vegetable oils.
For those struggling with significant weight issues and related health complications, a diet lower in carbohydrates (around 25% of calories) can be beneficial. However, it is important to consult with a healthcare professional before starting any restrictive diet, as avoiding an entire food group is extremely challenging to sustain long-term and may lead to nutritional deficiencies.
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Frequently asked questions
Carbohydrates are macronutrients that are rich in starch, fiber, and water. They provide most of the fuel for daily activity and functioning.
Cutting carbs can lead to weight loss, especially in people with significant excess weight or obesity. It can also improve heart health and blood sugar control. However, it may also cause constipation, digestive issues, and a lack of energy.
Yes, a no-carb diet may not provide enough nutrients, vitamins, and minerals. It can also be very restrictive and difficult to sustain long-term. Some studies have also linked low-carb diets to increased mortality and other complications such as kidney damage and osteoporosis.
Meat and low-carb animal products like chicken, beef, and eggs, seafood like salmon and shrimp, nuts and seeds, and non-starchy vegetables like broccoli and zucchini.
It is generally not recommended for healthy adults to completely cut out carbs. Instead, focus on reducing processed carbohydrates and sugary foods, and increasing your intake of whole grains, fruits, and vegetables. Consult with your doctor or a healthcare professional before making any significant dietary changes.
