What is a low carbohydrate diet (Low Carb diet)?

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What is a low-carbohydrate diet?

There is no single official definition of a low-carbohydrate diet. It can take on extremely different forms precisely depending on the amount of carbohydrates allowed in the diet – low carb diets include the ketogenic (keto) diet, the Atkins diet, the paleo diet, the Dukan diet or the South Beach Diet. Each of the aforementioned diets varies in terms of the carbohydrate content of the daily menu, as well as the principles of carbohydrate consumption – but all focus on reducing carbohydrates as a key element of a nutritional strategy for weight loss and improved metabolic health. It can be assumed that the carbohydrate values present in a carbohydrate-restricting diet classify it into one of three categories:

• Ketogenic diet (VLC): <10% or 20-50g of carbohydrates per day. (The aim of this diet is to induce a state of ketosis – a metabolic state in which the body derives energy mainly from ketones).
• Low carbohydrate (LC) diet: 10-25% or 50-130g of carbohydrates per day. (This is a less restrictive version of the ketogenic diet, which can put the body into a slight state of ketosis, but does not always induce full keto-adaptation).
• Moderate low-carbohydrate diet (Moderate Carb): 26-45% or 130-225g of carbohydrate per day. (This level of carbohydrate does not usually induce ketosis, but can promote blood glucose control and affect metabolism in a beneficial way, especially in people with insulin resistance).

What is the low carb diet all about?

A low-carbohydrate diet involves a significant reduction of carbohydrates in the daily menu in favour of a higher proportion of fats and a moderate amount of protein. It is most often based on the idea that reducing the amount of carbohydrates consumed (which are the main source of energy in a traditional diet) will force the body to use fat as its main source of energy – is this rightly assumed by the low carb diet? The principles associated with a more restrictive low-carbohydrate lifestyle effectively lead to a physiological change in metabolism, where instead of glucose, the body effectively uses ketones to obtain energy for function, which can ultimately support fat burning and improved health parameters.

What are the macro ratios on a low carb diet?

On a low-carbohydrate diet, macronutrient ratios are optimised to reduce carbohydrates, increase fat supply and ensure adequate protein is on the menu, which will ultimately support health and result in the achievement of nutritional, health and metabolic goals. The proportions of the diet can therefore vary greatly depending on individual needs – however, the following values can generally be assumed:

• Carbohydrates: 5-30% of total calorie intake.
• Protein: 20-35% of total calorie intake.
• Fats: 45-75% of total calorie intake.

What types of low-carbohydrate diets are there?

Although the common goal of low-carbohydrate diets is to limit carbohydrate intake, they can vary radically in the intensity of these restrictions – the proportions of macronutrients on the menu and the mechanisms of action. In addition, each of these diets should be individually tailored and, one could say, modified specifically in response to the health condition, needs or preferences of the follower:

LCHF (Low Carb, High Fat) diet – is based on limiting carbohydrates in favour of fats, but theoretically with more flexibility than the ketogenic diet implies.

Ketogenic diet – very low carbohydrate, high fat and moderate protein, leading to a state of ketosis in which ketone bodies become the main source of energy.

Atkins diet – a diet divided into four phases, ranging from very restrictive to slightly more flexible, with a gradual increase in carbohydrates on the menu.

Paleo diet (low carbohydrate version) – a paleolithic diet, which is modelled on the diet of our ancestors and is primarily based on eating meat, fish, nuts, seeds, vegetables and fruit – it is based on natural products, completely eliminating processed foods.

Dukan diet – a high protein diet divided into four phases: impact (pure proteins), alternation (proteins and vegetables), consolidation and stabilisation. It is based on the consumption of a large amount of protein with a minimum supply of carbohydrates and fats, gradually introducing a variety of foods.

What are the principles of the low carb diet?

The basic principles of the low-carbohydrate diet include several key elements to help you achieve your health and weight-loss goals. What does the low carb diet entail? It breaks down macros in an unusual way to suit individual needs and goals. This diet is based on a reduction in carbohydrates, which means a reduction in sugary and starchy foods such as bread, pasta and rice, and the elimination of traditional sweets. Carbohydrates are replaced here by proteins and healthy fats, which increase the feeling of satiety and support the body’s metabolic processes. Another principle of the low carb diet is the consumption of vegetables (especially low starch ones), such as broccoli or spinach, which provide essential vitamins and minerals with a minimum of carbohydrates. It is also important to avoid processed foods, which often contain hidden sugars and unhealthy fats. With these principles, a low-carbohydrate diet can support metabolic health and contribute to effective weight loss.

Who is a low-carbohydrate diet suitable for?

A low-carb diet can be beneficial for different groups of people – including those struggling with a variety of health conditions (particularly those related to glycaemic blood disorders). Still, the question often arises – is a low-carbohydrate diet healthy? Well, yes, and it can definitely be modified for personal needs in such a way that it becomes even the healthiest dietary option possible. Who should follow a low-carbohydrate diet?

• People who are overweight or obese – it can support their weight loss process by reducing appetite and increasing feelings of satiety.
• People with type 2 diabetes – restricting carbohydrates can help regulate blood sugar levels and improve insulin sensitivity.
• People with metabolic problems – this diet may be beneficial for those with insulin resistance or metabolic syndrome.
• Athletes and physically active people – although the low carb diet is often used by people who want to lose weight, some athletes may use it to improve performance and recovery after training.

For whom might a low-carb diet not be suitable?

A low-carb diet may not be suitable for people with kidney disease, as the high protein supply may put additional strain on the kidneys, and it may not be safe for pregnant and breastfeeding women, who need a balanced diet with adequate carbohydrates. People with type 1 diabetes should only use it under close supervision, as should people with hypothyroidism, in whom too low a carbohydrate supply can impair thyroid function and lead to an increase in endocrine disruption. Children and adolescents during the growth period and athletes may suffer from the negative effects of inadequate carbohydrate intake, such as reduced performance and decreased energy. This diet is also not recommended for people with eating disorders, which can exacerbate these problems, or for people with hypoglycaemia, as carbohydrate restriction can often lead to dangerous sugar drops. There is a similar risk in people with certain liver conditions, which are responsible for the metabolic processes exacerbated by a low-carbohydrate diet. In all the above-mentioned cases, it is necessary to consult a doctor or dietician before starting the diet. These exclusions are worth verifying under the guidance of a professional, which does not mean that they determine the impossibility of following this type of diet.

What to eat on a low-carbohydrate diet?

As the low carb diet is based on eating foods that are low in carbohydrates, yet rich in protein and healthy fats – it can include a wide variety of raw materials and a variety of flavours. What foods do low-carbohydrate diets require most? What to eat on a well-balanced low carb diet?

It is recommended to eat meat (beef, pork, poultry) and fish, especially oily fish such as salmon and sardines. Eggs and full-fat dairy products such as Greek yoghurt and cheese are also excellent sources of protein. It is also important to include low-starch vegetables such as broccoli, spinach and peppers, which provide essential vitamins and minerals. Nuts and seeds are healthy sources of fats, and olive oil and avocados are ideal additions to meals that a low-carbohydrate diet can and should include. Macros can be present in different proportions, but in estimating their percentage of the menu, it is important to keep in mind first and foremost which foods should not be eaten and which foods should be absolutely excluded on a low carb diet e.g. sweets.

Which foods have the least carbohydrates?

On a low-carbohydrate diet, it is advisable to go for products that contain minimal amounts of carbohydrates, which is conducive to success in achieving your health and weight loss goals:

• Meat and fish contain no carbohydrates
• Eggs – there are approximately 0.6 g of carbohydrates in 100 g of hen’s egg . One medium egg (about 50 g) has about 0.3 g of carbohydrates.
• Nuts and seeds:
  • Pecans contain about 4 g of carbohydrates per 100 g.
  • Macadamia nuts – contain 5 g of carbohydrates per 100 g.
  • Chia seeds – contain approximately 7 g of carbohydrate per 100 g (most of which is fibre).
• Low starch vegetables:
  • Broccoli – contains about 4 g of carbohydrate per 100 g.
  • Lettuce contains approximately 1 g of carbohydrate per 100 g.
  • Spinach contains approximately 1 g of carbohydrate per 100 g .

In a low-carbohydrate dietary style, it is important to eat the foods that are recommended – essential for a well-balanced menu, but just as important are the foods that a low-carb diet absolutely excludes – what not to eat? And what to limit in your daily diet?

What do low-carbohydrate foods exclude?

The low carbohydrate diet excludes or significantly restricts the consumption of many products that are rich in carbohydrates. First and foremost, white bread and processed, refined cereal products should be avoided, which provide large amounts of simple carbohydrates and can cause blood sugar spikes. Another group of products are sweets and all sweetened drinks, which contain refined sugars and can lead to weight gain and insulin resistance. On a low carb diet, you should also limit most fruits, especially those rich in sugars such as bananas, grapes, apples and mangoes. What else does the low-carbohydrate diet exclude? The proportions of macronutrients in the diet are variable, but you should also be wary of large quantities of starchy vegetables such as potatoes and maize. Finally – the key is to avoid processed foods, which often contain high-carbohydrate additives and unhealthy fats. With these principles and the consumption of carbohydrate-free foods, the low-carb diet can effectively support weight loss and improve overall health.

What do recipes look like on a low-carbohydrate diet?

To answer the question of what is best to cook on a low carb one must first ask other questions – what dishes should a low carb diet include? Who is it intended for? The answer is simple – this diet is suitable for practically everyone (in the case of healthy people), and the dishes should be composed in such a way that the proportions of all macronutrients are within the pre-determined percentage ranges. Below are examples of dishes that a low-carbohydrate diet could include – recipes:

Avocado and salmon salad with lemon dressing – great for lunch or a light dinner:

• 100g smoked salmon
• 1 avocado
• 1 small cucumber
• 1/2 red onion
• Handful of spinach or rocket
• Juice of 1/2 lemon
• 1 tbsp olive oil
• Salt and pepper to taste

Preparation:

1. Dice the avocado and cucumber and thinly slice the onion.
2. Arrange the spinach or arugula on a plate, add the chopped vegetables and salmon slices.
3. Drizzle with lemon juice, add olive oil, salt and pepper and mix gently.

Chicken in cream sauce with mushrooms and spinach – a filling, flavoursome dish perfect for lunch or dinner.

Ingredients:

• 2 chicken fillets
• 200 g sliced mushrooms
• 1 clove of garlic, finely chopped
• 1/2 cup 30% cream
• 1/2 cup vegetable broth
• Handful of fresh spinach
• 2 tablespoons of clarified butter (ghee)
• Salt and pepper to taste

Preparation:

1. Heat the clarified butter in a frying pan and fry the chicken fillets on both sides until golden and juicy. Season with salt and pepper. Push the chicken aside.
2. In the same pan, fry the garlic and mushrooms until soft.
3. Add the cream and broth, then throw in the spinach. Cook until the sauce thickens slightly.
4. Add the chicken back in, pour over the sauce and simmer for a few more minutes.

Courgette ‘Noodles’ with prawns and pesto – a great alternative to pasta that will work well on a low carbohydrate diet.

Ingredients:

• 2 medium courgettes (to make ‘noodles’ using a peeler or spiralizer)
• 200 g prawns, peeled
• 2 tbsp pesto (preferably homemade)
• 1 tbsp olive oil
• Salt and pepper to taste
• A few basil leaves for garnish

Preparation:

1. Prepare the courgette ‘noodles’ with a spiralizer or cut into thin strips with a peeler.
2. Heat the olive oil in a large frying pan, add the prawns and fry for 2-3 minutes until pink and juicy. Season with salt and pepper.
3. Add the courgette ‘noodles’ and pesto, stir gently so that the courgette is just slightly heated and coated with the sauce.
4. Serve immediately, garnished with basil.

These dishes are full of healthy fats and protein, yet low in carbohydrates, making them an ideal choice for a low-carb diet.

How do I adapt traditional recipes to a low-carbohydrate diet?

To properly adapt traditional recipes for a low-carb diet, replace carbohydrate-rich ingredients with their counterparts. All cereal products can be replaced with products made from almond, coconut or flax flour, and sugar with natural sweeteners such as erythritol, stevia or monk fruit. Instead of rice, for example, cauliflower rice is used, and pasta can be replaced by courgette noodles or konjac noodles. Potatoes can be replaced by cauliflower puree or roasted swede. In traditional baking, it is worth using keto flours or ready-made low-carbohydrate baking mixes. Instead of thickening sauces with flour, use cream, mascarpone or xanthan gum. Desserts can be adapted by using keto-friendly flours and healthy fats such as coconut oil or peanut butter. For breadcrumbs instead of breadcrumbs, ground nuts, flaxseed or Parmesan cheese, among others, are suitable.

Such modifications will allow you to enjoy your favourite low-carb recipes while sticking to the diet rules.

What does a low carb menu look like?

What should a sample daily menu look like that could be included in a low carb diet? The menu on a low-carbohydrate diet can really be very varied and tailored to individual taste and dietary preferences. An example meal plan for one of the days of the diet might look like the following:

• Breakfast – scrambled three eggs with bacon and fresh tomatoes, served with avocado.
• Lunch – grilled salmon with a salad of fresh vegetables such as rocket, cucumber and peppers, drizzled with olive oil.
• Afternoon – a handful of walnuts or almonds.
• Dinner – beef stew with steamed broccoli, topped with a garlic sauce based on natural yoghurt.

A properly balanced low carb diet at home – whoever it is prepared for (and it can be followed by the whole family) will always be nutritious, safe and supportive of health and well-being.

How do I plan a weekly menu on a low-carbohydrate diet?

Planning a weekly menu on a low-carbohydrate diet involves familiarising yourself with the low-carb diet, researching your own health needs and focusing on your own taste preferences for your daily diet.

1. Determine your macronutrient requirements – calculate your daily calorie needs and the ratio of fats, proteins and carbohydrates (e.g. on a keto diet: 70-80% fats, 10-20% protein, 5-10% carbohydrates).
2. Choose sources of valuable protein – plan meals using meat (chicken, beef, pork), fish (salmon, tuna, mackerel), eggs and dairy products (cheese, natural yoghurt, cream).
3. Add healthy fats – include fats such as avocado, olive oil, coconut oil, clarified butter, nuts and seeds.
4. Add low-carbohydrate vegetables – focus on low-carbohydrate favourites (spinach, lettuce, courgette, broccoli, cabbage), which are high in fibre and micronutrients and low in carbohydrates.
5. Include favourite dishes with carbohydrate substitutes in your menu.
6. Establish a meal structure – plan your main and smaller meals for the day – have a specific eating strategy based on your schedule, time availability and cravings.
7. Prepare a shopping list – make a list of ingredients needed for all meals.
8. Prepare a preparation schedule – you can prepare larger portions of dishes that are worth storing in the fridge and freezing, to save time (e.g. roast meat, creamy soups).

It is not difficult to stick to the low-carb menu, but the most important thing is to be systematic, even if there are some failures.

What results can be expected from a low carb diet?

Following a low-carb diet can bring a number of health benefits – including weight loss through faster fat burning, which promotes the reduction of body fat. Restricting carbohydrates also helps control blood sugar levels (which is particularly important for people with insulin resistance and type 2 diabetes), stabilising glucose levels. How exactly does the low carb diet work – what exactly does this blood sugar control involve?

The low carb diet involves reducing the amount of blood glucose available after meals, reducing the need for insulin production. By having less fluctuation in blood glucose, we avoid insulin spikes, which are characteristic of a carbohydrate-rich diet and can eventually lead to hypoglycaemia and hunger attacks. For people with insulin resistance, a lower carbohydrate supply means a reduced load on the pancreas and improved cellular sensitivity to insulin. Stable sugar levels also reduce the risk of lifestyle diseases such as type 2 diabetes and cardiovascular conditions.

In addition, the higher protein and fat content of the menu increases the feeling of satiety, which reduces hunger and makes it easier to control appetite by following a low-carbohydrate diet. By reducing blood sugar fluctuations, the diet also promotes better concentration and guarantees stable energy levels, without energy dips which contributes to an improved overall wellbeing and increased productivity. All these effects make the low-carbohydrate diet increasingly popular as an effective method for weight loss and improved health.

Does a low-carbohydrate diet help with weight loss?

A low-carbohydrate diet can support weight loss by, among other things, lowering insulin levels, which facilitates fat burning and reduces water retention in the body, leading to rapid weight loss (especially at the beginning of the diet). Restricting carbohydrates in the menu effectively stabilises blood sugar levels, reducing hunger attacks and cravings, and over time the body starts to draw energy from fat significantly, thus also promoting fat reduction. The high protein and fat content of the diet increases the feeling of satiety, which further helps to control calorie intake and suppresses cravings. Research indicates that low-carbohydrate diets can lead to greater weight loss than low-fat diets, especially in the first months, provided a calorie deficit is maintained. [1]

Is a low-carbohydrate diet healthy?

This diet can be helpful in reducing body fat and supportive for many people, especially those associated with diabetic and metabolic problems. Provided, of course, that it is a properly composed low carb diet. The health effects of low-carbohydrate diets can be truly spectacular.

Is a low-carbohydrate diet dangerous?

A low-carbohydrate diet is not dangerous, but people with chronic diseases such as type 1 diabetes (who take insulin and medication), people with heart disease, kidney disease and pregnant or breastfeeding women should ideally consult a doctor or dietician before starting it (especially if they want to choose a more restrictive form of low-carbohydrate diet).

In people with type 1 diabetes, this diet requires precise monitoring and adjustment of insulin to avoid hypoglycaemia. People with heart or kidney disease may experience electrolyte disturbances as the low-carb diet often accelerates water and salt loss, affecting sodium, magnesium and potassium levels. If you are pregnant or lactating, this diet should be used with caution due to the higher energy and carbohydrate requirements.

How long can you be on a low-carbohydrate diet

The duration of a low-carbohydrate diet depends on individual dietary goals and overall health. Some people achieve their goals of, for example, losing a specific amount of weight after just a few weeks on the diet, while others may maintain a low-carbohydrate diet for a longer period of time as a lifestyle – it also happens that those who restrict sugar and carbohydrates by choice do not always know what a low-carb diet is, but successively follow it and reap its health benefits. This is why, beyond names or classifications of diets – it is simply important to assess one’s own health on an individual basis and to monitor the body’s response to the meals taken in and to constantly adapt the diet to one’s own health needs.

Can the low-carb diet be used long-term?

A low-carb diet is possible in the long term, but it requires an appropriate approach, a balanced diet and constant monitoring of wellbeing. Many people choose this form of diet in order to reduce body weight and improve health parameters, e.g. stabilisation of blood sugar and improvement of the lipid profile. However, a long-term low-carb diet carries a potential risk of nutrient deficiencies, so it is worth consulting a dietitian to ensure that the diet is properly balanced for your own needs.

When is it worth taking a break from a low-carbohydrate diet?

First and foremost, a break from low carb can be beneficial when symptoms such as fatigue or any digestive problems occur. These symptoms may indicate that the body needs more time to adapt to the new way of eating, or that the diet is not providing enough essential micronutrients. When you decide to take a break, it is important to do so in a thoughtful and gradual way to avoid the yo-yo effect. Gradually introducing carbohydrates into the diet allows the body to better adapt to the new diet and minimises the risk of sudden changes in energy levels and mood. It is also worth paying attention to how your body reacts to dietary changes, if you notice an improvement in your mood when you return to a more balanced way of eating, this could be a signal that a long-term low carb diet is not optimal for you at the current time.

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