Supplementation for people on a ketogenic diet

The ketogenic diet, which is based on a very low carbohydrate intake and high fat consumption, is attracting increasing interest. This topic attracts the attention of both people concerned with their figure and a healthy lifestyle, as well as doctors and scientists in the medical community. Many people ask themselves: do you need to take dietary supplements when following a ketogenic diet? The answer is not straightforward, because this diet, although it can bring benefits in certain situations, also carries the risk of deficiencies of selected nutrients. It is therefore worth understanding at the outset how the ketogenic diet works, what challenges it poses for the body, and which supplements can support the proper functioning of the body on a ketogenic diet.

Mechanisms of action of the ketogenic diet and its impact on the body

The ketogenic diet involves a significant reduction in carbohydrates (usually below 50g per day) and an increase in the proportion of fats in the diet. This way of eating leads to a state of ketosis, in which the body begins to produce ketone bodies (such as beta-hydroxybutyrate and acetoacetate), which are an alternative source of energy for the brain and muscles when blood glucose levels are low. Metabolic changes induced by the ketogenic diet also include changes in water-electrolyte balance, digestive system function, and vitamin and mineral metabolism.

In clinical practice, the ketogenic diet is used in the treatment of drug-resistant epilepsy, and as support for the therapy of obesity, type 2 diabetes, some neurological and metabolic diseases. Its potential is increasingly recognized in precision medicine, where the diet is tailored to the individual needs of the patient, taking into account their genetic and metabolic profile.

The most common deficiencies on a ketogenic diet

Limiting the consumption of carbohydrate-based products such as: grain products, fruits, starchy vegetables and some dairy products means that the ketogenic diet can lead to deficiencies of certain vitamins and minerals. The most frequently observed deficiencies include:

• Magnesium – a mineral essential for the proper functioning of muscles, the nervous system and heart function. Its deficiencies can lead to cramps, weakness and heart rhythm disorders.
• Potassium – important for water-electrolyte balance and muscle function. Deficiencies can manifest as weakness, fatigue, heart rhythm disorders.
• Sodium – at the beginning of the ketogenic diet, there is an increased excretion of sodium in the urine, which can lead to headaches, dizziness and general weakness.
• Calcium – limiting the consumption of milk and its products can result in calcium deficiency, important for bones and muscles.
• B vitamins – elimination of whole grain products and some vegetables limits the supply of vitamins B1, B2, B3, B6 and folic acid.
• Vitamin C – its sources are mainly fruits and some vegetables, which are consumed in limited quantities on a ketogenic diet.
• Selenium, zinc, iron – minerals important for cognitive functions, immunity and metabolic processes.

When deciding on a ketogenic diet, it is important to remember to provide yourself with those ingredients that may be lacking, for example, with the help of dietary supplements.

Vitamins and minerals – key elements of supplementation

Proper supplementation on a ketogenic diet should be individually tailored, however, there are some general recommendations worth considering.

Magnesium

It is one of the most commonly deficient minerals on a ketogenic diet. Magnesium participates in over 300 enzymatic reactions (chemical reactions in the human body that are catalyzed by enzymes). Magnesium acts as a cofactor, a substance that supports the action of enzymes, enabling them to efficiently carry out many processes. These include energy production (ATP), synthesis of proteins, nucleic acids (DNA and RNA), regulation of blood sugar levels, nerve conduction, and muscle contraction. Without magnesium, many of these reactions occur much slower or not at all, which can disrupt basic body functions. Magnesium is therefore essential for the proper functioning of muscles, the nervous system, and maintaining electrolyte balance. Magnesium supplementation is indicated especially for people experiencing muscle cramps or chronic fatigue.

Potassium and sodium

On a ketogenic diet, especially in the initial phase, the body loses more water and electrolytes, which often leads to potassium and sodium deficiency. Symptoms such as weakness, headaches, or dizziness are signals that the intake of these minerals should be increased. It is often recommended to salt dishes and consume potassium-rich products such as avocados or green leafy vegetables.

Calcium

Calcium is essential for the proper functioning of the skeletal and muscular systems. If you limit dairy, consider calcium supplementation or reach for plant-based products fortified with this mineral.

B vitamins

B vitamins, such as thiamine (B1), riboflavin (B2), niacin (B3), pyridoxine (B6), and folic acid (B9), are crucial for energy metabolism and nervous system function. Their deficiencies can lead to concentration problems, chronic fatigue, and impaired cognitive function. Supplementation with B-complex vitamins is often indicated, especially for people who do not consume offal, eggs, or green leafy vegetables.

Vitamin C

Vitamin C acts as an antioxidant and supports the proper functioning of the immune system. Its deficiency on a ketogenic diet can be a result of limited fruit consumption. It is worth choosing low-carb vegetables rich in vitamin C, such as peppers or broccoli, and consider supplementation if necessary.

Selenium, zinc, iron

These minerals are essential for the proper functioning of the immune system, metabolic processes, and cognitive functions. Their deficiencies can occur if the ketogenic diet is monotonous or excludes animal products. Supplementation should be individually selected after consultation with a dietitian or doctor.

Supplementation supporting cognitive and metabolic functions

As the latest research shows, the ketogenic diet can support cognitive functions and be a supportive element in the therapy of some neurological diseases. However, to fully exploit its potential, it is necessary to ensure an adequate level of nutrients.

Omega-3 fatty acids

Omega-3 fatty acids, such as DHA and EPA, support cognitive functions and metabolic processes. Their source is fatty fish, but people on a ketogenic diet who do not regularly consume fish may consider supplementing with fish or algal oil.

Medium Chain Triglycerides (MCT)

MCT oil (Medium Chain Triglycerides – a fat consisting of medium-chain fatty acids) is a good source of quickly supplied energy. Because it is digested and absorbed very quickly – it does not require the presence of bile or special enzymes, so it almost immediately goes from the intestines to the liver, where it is converted into energy and ketone bodies. Thanks to this, it is like an energy boost especially for people on a ketogenic diet, athletes, and those who need immediate support after exercise. MCT supplementation is popular among people on a ketogenic diet, especially in the initial adaptation phase.

Probiotics

Changes in diet can affect the composition of the gut microbiota. Limiting carbohydrates, and thus also dietary fiber, “starves” many beneficial gut bacteria, especially those of the Bifidobacterium and Lactobacillus genera. Studies show that even in the first weeks of following a keto diet, the number and diversity of the microbiota can significantly decrease, which can lead to bacterial imbalance in the intestines. Why is this so important? A diverse gut microbiota plays a key role in the proper functioning of the digestive system, supports the intestinal barrier, limits the growth of pathogenic bacteria, and has anti-inflammatory effects.

A decrease in the number of bifidobacteria and other “good” bacteria can result in worse digestion, greater susceptibility to infections, and even immune disorders. Supplementation with probiotics containing specific strains, such as Lactobacillus rhamnosus GG ATCC 53103, can support the proper functioning of the digestive system.

Safety and individualization of supplementation

The choice of supplements depends on the individual needs of the body. It is good to first do tests and then consult the results with a doctor or dietitian. Excessive supplementation, especially fat-soluble vitamins (A, D, E, K), can lead to their accumulation in the body and undesirable effects. In turn, deficiencies of minerals such as magnesium, potassium, or calcium can negatively affect the functioning of muscles, the nervous system, and the cardiovascular system.

It is worth regularly monitoring the levels of selected vitamins and minerals in the blood, especially with long-term use of the ketogenic diet. Supplementation should be flexible and adapted to the changing needs of the body, level of physical activity, and health status.

Supplementation and the effects of the ketogenic diet

Scientific studies confirm that appropriate supplementation can support the proper functioning of the body on a ketogenic diet, minimizing the risk of deficiencies and undesirable side effects. Meta-analyses show that the ketogenic diet can be effective in weight loss, improving metabolic parameters, and supporting cognitive functions and brain work if all necessary nutrients are provided.

In clinical practice, the ketogenic diet is increasingly used as a supportive element in the therapy of many diseases, but its effectiveness and safety depend on adherence to dietary recommendations and proper supplementation.

In summary

The ketogenic diet is an effective tool supporting weight reduction and metabolic functions, as well as support in the treatment of selected neurological diseases. However, its use is associated with the risk of vitamin and mineral deficiencies, so supplementation should be an integral part of this dietary model. The key is an individual approach, regular monitoring of nutritional status, and the selection of high-quality supplements that support the proper functioning of the body on a ketogenic diet.

It is worth remembering that dietary supplements do not replace a varied diet and a healthy lifestyle. Their use should be thoughtful and adapted to our needs and the recommendations of specialists.

Sources: