Milly Gaines
The ketogenic diet, often referred to as the keto diet, is a low-carbohydrate, high-fat diet that has been around since the 1920s. It was initially used to reduce seizures in children with epilepsy, but today it is widely known as a weight-loss tool. While the keto diet has proven to be effective for weight loss, it also comes with some risks and side effects, one of which is feeling weaker than usual. This feeling of weakness is often attributed to dehydration and electrolyte imbalances caused by the body's transition from burning carbohydrates to burning fat for energy.
| Characteristics | Values |
|---|---|
| Reason for feeling weak | Dehydration and loss of electrolytes |
| Solution | Drink plenty of water and take electrolytes |
| Macronutrient distribution | 55% to 60% fat, 30% to 35% protein, 5% to 10% carbohydrates |
| Calorie distribution | 90% of daily calories from fat |
| Weight loss | Effective in the short term |
| Risks | High in saturated fat, nutrient deficiency, liver problems, kidney problems |
| Side effects | Keto flu, fatigue, headache, dizziness, nausea, vomiting, constipation, low exercise tolerance |
| Long-term side effects | Hepatic steatosis, kidney stones, hypoproteinemia, vitamin deficiency |
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What You'll Learn
Dehydration and loss of electrolytes
Dehydration and electrolyte imbalances are common side effects of the ketogenic diet, especially when starting the diet. This is because the body is undergoing a lot of changes, including the elimination of glycogen, which holds water, from the bloodstream. Carbohydrates hold the body's water and sodium, helping to ensure hydration.
The ketogenic diet is a low-carbohydrate, high-fat diet, which means the body produces ketones to burn fat for energy instead of glucose. This process leads to the loss of water and electrolytes, resulting in dehydration. Electrolytes are essential as they help the body absorb and utilize nutrients. Electrolyte imbalances can lead to dehydration and cause various unpleasant symptoms, including muscle cramps, headaches, fatigue, constipation, increased thirst and hunger, and dizziness.
To avoid dehydration and electrolyte imbalances, it is recommended to increase water intake to at least 2-3 litres per day and incorporate electrolyte-rich foods and drinks. Leafy vegetables have a high water content, while nuts and seeds are good sources of electrolytes. Avocados, cucumbers, and celery are low-carbohydrate foods that also contain a lot of water.
It is important to note that dehydration can lead to other health complications, such as kidney stress and kidney stones. Therefore, staying properly hydrated and maintaining adequate electrolyte intake are crucial when following the ketogenic diet.
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Lack of nutrients
The ketogenic diet is a low-carbohydrate, high-fat diet that has been used since the 1920s to reduce seizures in children with epilepsy. In recent years, it has gained popularity as a weight-loss tool. However, the ketogenic diet has been criticised for its restrictive nature, which may lead to nutrient deficiencies.
The keto diet restricts several food groups, including grains, legumes, fruits, and starchy vegetables. This restriction may result in a lack of essential vitamins and minerals, such as vitamin B1, vitamin B6, vitamin B7, vitamin B12, calcium, iron, magnesium, and phosphorus. These nutrients are necessary for the body to function properly, and a deficiency can lead to adverse health effects.
For example, a keto diet that includes organ meats and high volumes of low-carb vegetables is more nutritionally secure than one that consists primarily of steak and butter. Bacon and cheese, two foods commonly consumed on the keto diet, can also lead to nutrient deficiencies if eaten in excess.
Additionally, the keto diet's emphasis on high-fat foods can increase the risk of heart disease due to elevated levels of "bad" LDL cholesterol. The diet may also lead to liver and kidney problems, as these organs work to metabolise the high amounts of fat and protein consumed on the keto diet.
To avoid potential nutrient deficiencies, it is important to include a variety of recommended foods in the keto diet, such as meats, fish, vegetables, fruits, nuts, and seeds. These foods provide essential nutrients like fibre, B vitamins, and minerals, which are typically found in whole grains that are restricted on the keto diet. Consulting a registered dietitian can help create a ketogenic diet that minimises nutrient deficiencies while still achieving the desired weight loss.
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Kidney problems
The ketogenic diet is a very low-carbohydrate diet that has become popular for weight loss, blood sugar control, and improved energy. However, concerns have been raised about its long-term safety and effectiveness, especially regarding kidney health.
The keto diet has been associated with an increased risk of kidney problems, including kidney stones and even kidney failure. The diet's high protein and fat content can lead to an increased acid load in the body, resulting in metabolic acidosis, which can further cause kidney issues. This is especially true for those who already have kidney disease or reduced kidney function.
Several studies and case reports have highlighted the potential risks of the keto diet on kidney health. One study found that high protein intake, a common feature of keto diets, directly caused an increase in kidney volume and weight in animal models. Another study showed that the keto diet worsened kidney stones in patients with epilepsy. Additionally, a case report presented a 36-year-old female patient with no underlying renal issues who developed acute renal injury after starting a ketogenic diet.
However, it is important to note that some studies suggest that the ketogenic diet may not negatively affect kidney function in the short term. For example, ketogenic metabolic therapy (KMT) has been found to be safe and potentially therapeutic for individuals with chronic kidney disease (CKD). KMT can address abnormal metabolic health, which is a common cause of CKD, by restricting carbohydrates and promoting ketosis.
Overall, while the keto diet may offer weight loss benefits, it is essential to consider the potential risks to kidney health, especially for those with pre-existing kidney issues. Consulting with a physician or nephrologist before starting any dietary changes is crucial to ensuring kidney health and preventing possible harm.
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High cholesterol
The ketogenic diet is a high-fat, moderate protein, and low-carbohydrate diet. While it is popular for its weight-loss benefits, there are concerns about its impact on cholesterol levels.
Some studies suggest that the keto diet can lower levels of high-density lipoprotein (HDL), or "good," cholesterol, while raising levels of low-density lipoprotein (LDL), or "bad," cholesterol. This effect may be more pronounced in "hyper-responder" patients, who experience dramatic elevations in LDL cholesterol. However, other studies have found conflicting results, with some showing an increase in HDL cholesterol levels and a decrease in LDL cholesterol levels after following the keto diet for a longer period.
The increase in LDL cholesterol levels may be due to a higher consumption of saturated fats, which are prevalent in many animal and dairy products. Patients with a genetic predisposition to cholesterol metabolism dysregulation may also experience a more significant increase in cholesterol levels when on the keto diet. Additionally, those with lower BMIs tend to exhibit a larger percentage increase in LDL cholesterol levels.
To prevent high cholesterol while on the keto diet, it is recommended to consume more polyunsaturated and monounsaturated fats, which are beneficial for reducing cholesterol levels and improving heart health. Examples of polyunsaturated fats include plant-based oils like sunflower and corn oil, while olive oil and peanut oil are sources of monounsaturated fats. It is also important for patients to consult a physician before starting the keto diet, as it may not be suitable for everyone, especially those with existing health conditions.
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Short-term side effects (e.g. fatigue, dizziness)
The ketogenic diet is a low-carbohydrate, high-fat diet that has been around since the 1920s. It was initially used to reduce seizures in children with epilepsy, but today it is more commonly used as a weight-loss tool. The diet typically consists of 55% to 60% fat, 30% to 35% protein, and 5% to 10% carbohydrates.
When starting a ketogenic diet, some people may experience short-term side effects, commonly known as the "keto flu.". These symptoms include fatigue, dizziness, nausea, vomiting, headache, insomnia, reduced exercise tolerance, and constipation. These side effects usually resolve within a few days to weeks as the body adjusts to the new diet.
The "keto flu" symptoms occur due to a drop in blood glucose and insulin levels, which leads to a loss of water, sodium, magnesium, and other electrolytes like potassium. This dehydration can leave individuals feeling weak, dizzy, and fatigued. It is important to ensure adequate fluid and electrolyte intake to counter these side effects.
The ketogenic diet can be an effective tool for weight loss and has shown promising results in the short term. However, it is not suitable for everyone, and those considering it should consult a doctor and a registered dietitian to ensure they are making an informed decision.
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Frequently asked questions
A ketogenic diet, also known as a keto diet, is a low-carbohydrate, high-fat diet. The diet restricts carbohydrates, forcing the body to burn fat for fuel instead. Typically, a keto diet involves getting about 55% to 60% of calories from fat, 30% to 35% from protein, and 5% to 10% from carbohydrates.
Feeling weak on a ketogenic diet is often due to dehydration and a loss of electrolytes. When you restrict carbohydrates, your blood glucose and insulin levels drop, which triggers water and electrolyte loss. This can leave you feeling drained and weak. It is important to drink plenty of water and ensure adequate electrolyte intake to prevent dehydration.
Yes, a ketogenic diet can have various side effects, often referred to as "keto flu." These may include fatigue, headache, dizziness, nausea, vomiting, constipation, muscle cramps, and reduced exercise tolerance. Additionally, there are concerns about the long-term effects of a keto diet, including potential nutrient deficiencies, liver problems, and kidney issues. It is recommended to consult a doctor and a registered dietitian before starting a ketogenic diet.
