Brenda Khan
The ketogenic diet has become a popular way to lose weight, but it can lead to vitamin deficiencies. Restricting carbohydrates and, in some cases, protein, profoundly affects diet quality. This can result in a lack of essential vitamins and minerals, such as B vitamins, calcium, magnesium, and iron. While the keto diet may offer benefits like weight loss and seizure management, it is not without risks. Potential nutrient deficiencies, liver problems, kidney overload, constipation, and fuzzy thinking are among the concerns. Therefore, it is vital to be aware of these risks and address any deficiencies through supplementation or specific food choices.
| Characteristics | Values |
|---|---|
| Vitamin B1 (Thiamin) deficiency | High if not supplemented through food or multivitamin |
| Vitamin B6 deficiency | Common in low-carb diets |
| Vitamin B7 (Biotin) deficiency | Common in strict ketogenic diets |
| Vitamin B12 deficiency | Common in high-fat/carb-restrictive diets |
| Folate deficiency | Common in low-carb diets |
| Vitamin A deficiency | Common in low-carb diets |
| Vitamin E deficiency | Common in low-carb diets |
| Vitamin C deficiency | Common if not eating a wide variety of vegetables |
| Vitamin D deficiency | Common in low-carb diets |
| Calcium deficiency | Common in low-carb diets |
| Iron deficiency | Common in high-fat/carb-restrictive diets |
| Magnesium deficiency | Common in high-fat/carb-restrictive diets |
| Phosphorus deficiency | Common if not eating a wide variety of vegetables, fruits, and grains |
| Selenium deficiency | Common in low-carb diets |
| Iodine deficiency | Common in low-carb diets |
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What You'll Learn
Thiamin (vitamin B1) deficiency
The ketogenic diet has become a popular way to lose weight by restricting carbohydrates and replacing them with healthy fats. However, it is important to be aware of potential nutrient deficiencies.
Thiamin, or vitamin B1, is one such vitamin that may be lacking in a keto diet. Thiamin is an essential nutrient that all tissues of the body need to function correctly. It is water-soluble and helps the body turn food into energy. Thiamin is closely tied to carbohydrate metabolism, so on a low-carb keto diet, you may need less of it. However, thiamin deficiency can occur on a ketogenic diet if it is not supplemented through food or a multivitamin.
Foods that are high in thiamin include pork, with a 6-ounce pork chop containing 96% of your daily recommended value. A 6-ounce salmon fillet contains 48% of your daily value, and other sources include liver, kidney, and tongue, as well as eggs. Organ meats, in particular, are high in fat and contain high levels of vitamins and minerals.
Thiamin deficiency can lead to significant health problems, including beriberi and Wernicke-Korsakoff syndrome. Beriberi affects breathing, eye movements, heart function, and alertness, while Wernicke-Korsakoff syndrome causes visual impairments, lack of muscle coordination, and mental decline. Therefore, it is important to ensure adequate thiamin intake, especially when following a ketogenic diet.
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Biotin (vitamin B7) deficiency
Biotin, also known as vitamin B7 or vitamin H, is a B vitamin that helps the body convert carbohydrates into glucose for energy. It also plays a role in metabolizing fats and amino acids, which are necessary for building proteins. Biotin is naturally found in keto-friendly foods such as liver, egg yolks, meat, salmon, avocados, and cauliflower. However, biotin is used up extensively in the processing of fatty acids while on a keto diet.
A biotin deficiency is usually associated with symptoms such as thinning hair, which can progress to hair loss across the body, dry skin, scaly rashes, brittle nails, conjunctivitis, depression, fatigue, numbness, and tingling in the arms and legs. In an animal study, mice fed a strict ketogenic diet developed biotin deficiency at seven weeks, exhibiting typical symptoms such as hair loss and dermatitis (skin inflammation and rashes).
Biotinidase deficiency (BTD) is the most common cause of biotin deficiency. It is a rare inherited disorder where the body cannot utilize biotin, leading to a biotin deficiency. BTD is caused by a mutation in the BTD gene, which provides instructions for producing the biotinidase enzyme. This enzyme is essential for extracting biotin from food. BTD affects approximately one in 60,000 newborn babies, and symptoms typically appear in the first weeks or months of life. Without treatment, BTD can lead to a coma or even be fatal.
To prevent biotin deficiency, individuals on a ketogenic diet are advised to consider supplementation with vitamin B7. However, it is important to consult a healthcare professional before taking any supplements, as biotin may already be present in adult or prenatal vitamins, and high doses may have potential dangers. Additionally, some food processing techniques can destroy biotin, and raw egg whites contain a protein that interferes with the body's absorption of biotin. Therefore, a balanced diet that includes whole foods rich in biotin is generally recommended.
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Folate deficiency
The ketogenic diet has become a popular way to lose weight by restricting carbohydrates and replacing them with healthy fats. However, it's important to consider how this diet affects your body and its nutrient intake.
Folate, or vitamin B9, is among the most common deficiencies that can develop while on a ketogenic diet. Folate is necessary for life; every cell in our bodies depends on it. Folate is especially critical for women around conception to reduce the risk of neural tube defects (NTDs) in the developing fetus. NTDs affect the brain or spinal column and arise within the first 30 days after conception.
Genetics, diabetes, obesity, and MTHFR deficiencies may all contribute to NTD risks. The MTHFR gene creates a special enzyme involved in the complex process of folate metabolism, breaking down folate and folic acid to be used in cellular processes. Testing is available to determine if you have the MTHFR mutation, and if so, it is recommended to take methylfolate as a supplement instead of folic acid.
To avoid folate deficiency on a ketogenic diet, consume folate-rich foods raw or lightly cooked to minimize folate loss. Liver is a folate-rich food, and liver capsules are also suggested as a supplement. Leafy green vegetables such as kale, chard, and spinach are also good sources of folate.
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Calcium and vitamin D deficiency
The ketogenic diet is a popular way to lose weight by restricting carbohydrates and replacing them with large amounts of healthy fats that the body burns for energy. While this diet can be effective for weight loss, it can also lead to nutrient deficiencies, including calcium and vitamin D deficiency.
Calcium is important for maintaining strong bones and teeth, as well as for blood vessel function, muscle function, and nerve communication. On the ketogenic diet, calcium intake may be lower due to the restriction of calcium-rich foods such as fruits, vegetables, dairy, and enriched grains. Additionally, high-fat diets can increase the amount of acid generated by the body, which can lead to higher calcium loss in the urine and lower bone density. Studies suggest that 3–6% of people on a long-term keto diet may develop kidney stones due to high calcium levels and acidic urine.
Vitamin D is important for bone health and immune function. The ketogenic diet may affect vitamin D levels due to its low carbohydrate content and high fat and protein content. However, the exact effects of the ketogenic diet on vitamin D levels and metabolism are still being studied, and there is a need for more research to compare the effects of the ketogenic diet to other diets.
To prevent calcium and vitamin D deficiency while on the ketogenic diet, it is recommended to include keto-friendly foods rich in these nutrients, such as spinach, seeds, and nuts for calcium, and vitamin D supplements if necessary. It is also important to monitor kidney health by doing regular urinalysis to check for risk factors for kidney stones, such as high calcium levels and acidic urine.
In summary, the ketogenic diet can lead to calcium and vitamin D deficiency, which can have negative impacts on bone health and overall health. It is important to be aware of these potential deficiencies and take steps to prevent them by including calcium and vitamin D-rich foods in the diet and consulting a healthcare provider about supplementation if necessary.
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Selenium, magnesium, phosphorus deficiency
A ketogenic diet involves restricting carbohydrates and replacing them with large amounts of healthy fats, placing the body in a state of ketosis. While this can be an effective way to lose weight, it may also lead to vitamin and mineral deficiencies.
Selenium is a mineral that supports the function of several systems in the body. Selenium deficiency is rare, but it can occur if you live in an area with low selenium levels in the soil, as this affects the selenium content of food sources. Other factors that can increase the risk of selenium deficiency include age, health conditions, medications, and metabolism. Symptoms of selenium deficiency may include fatigue, muscle weakness, and infertility.
Magnesium is another mineral that is essential for hundreds of biochemical reactions in the body, including protein creation, muscle and nerve function, converting food into energy, and metabolism. While magnesium deficiency symptoms are usually mild, chronically low levels can increase the risk of high blood pressure, Type 2 diabetes, and osteoporosis.
Phosphorus is crucial for strong bones, and a deficiency can affect the body's ability to grow and develop properly.
To prevent these deficiencies, it is important to eat a well-balanced diet that includes a variety of food sources. If you are considering a ketogenic diet, it is recommended that you consult with a healthcare professional to ensure you are meeting your nutrient needs.
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Frequently asked questions
The ketogenic diet can cause deficiencies in several vitamins and minerals, including vitamin B1 (thiamin), vitamin B6, vitamin B7 (biotin), vitamin B12, calcium, iron, magnesium, phosphorus, selenium, iodine, and antioxidants like vitamin A and E.
The ketogenic diet restricts carbohydrates and proteins, which can lead to a decrease in the consumption of micronutrient-rich foods such as fruits, vegetables, grains, and legumes. As a result, the intake of certain vitamins and minerals may be limited or eliminated.
Vitamin deficiencies can have various negative impacts on health. For example, thiamin deficiency can lead to beriberi or Wernicke-Korsakoff syndrome, affecting breathing, heart function, and mental abilities. Deficiencies in other vitamins and minerals can also increase the risk of overweight/obesity, resistance to infection, birth defects, cancer, cardiovascular disease, and osteoporosis.
