Dante Carrillo
Headaches are a common side effect of starting a low-carb or ketogenic (keto) diet. The keto diet involves drastically reducing carbohydrate intake and replacing it with fats, which puts the body into a metabolic state called ketosis, where it burns fat as the primary energy source instead of carbohydrates. This shift can cause stress on the brain, leading to mental fatigue, brain fog, and persistent headaches. The good news is that these keto headaches are typically temporary and should subside once you pass the introductory phase of the diet as your body adapts to using fats as energy. Staying hydrated, consuming adequate sodium, and eating nutrient-rich foods can help prevent and alleviate keto headaches. While cutting back on carbs can be challenging, it's important to remember that our bodies do need carbohydrates, and complete carb elimination may lead to adverse effects like headaches.
| Characteristics | Values |
|---|---|
| Carbohydrates | Sugars, starches, and fiber |
| Carbohydrates composed of | Carbon, water, and hydrogen |
| Simple Carbohydrates | Sugars |
| Complex Carbohydrates | Starches and fibers |
| Keto Diet | High-fat, low-carb diet |
| Ketosis | Metabolic state where the body burns fat as its primary energy source |
| Keto Headache | A common side effect of the keto diet |
| Keto Flu | Flu-like symptoms, including headaches, brain fog, and fatigue |
| Dehydration | A common side effect of the keto diet, caused by frequent urination |
| Electrolyte Imbalances | Caused by low sodium levels and affected by insulin levels |
| Carb Withdrawal | The body adjusts to a new diet, causing temporary discomfort |
| Nutritional Needs | Carbohydrates provide essential nutrients and fiber |
| Glucose | The main source of fuel for the body and brain |
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What You'll Learn
Headaches are a common side effect of starting a keto diet
The keto diet is a popular eating pattern that replaces most of your carbs with fat. While it is linked to weight loss and other benefits, it also carries several risks. One of the most common side effects of starting a keto diet is the dreaded "keto headache" or "low-carb headache". This is because the keto diet drastically reduces your carb intake, replacing it with fat, and this shift causes metabolic changes that your body needs to adjust to.
Causes of keto headaches
There are several factors that may cause keto headaches, which typically occur when you begin the diet:
- Drop in blood sugar levels: Carbs are normally converted into glucose, which is the body's main source of energy. When you start the keto diet, your body begins relying on ketone bodies released by the liver from the breakdown of fat instead of glucose, which can cause your blood sugar levels to drop. This drop in blood sugar can trigger a migraine.
- Dehydration: As your body shifts into ketosis, it depletes its stored form of carbs, called glycogen, which is bound to water molecules. This causes a loss of water, and frequent urination, leading to dehydration. Dehydration can worsen headaches.
- Electrolyte imbalances: A drop in insulin levels, caused by lower carb intake, can affect electrolytes such as potassium and sodium, which play key roles in hydration. This can also contribute to headaches.
- Withdrawal: When you start the keto diet, your brain loses its main source of fuel, glucose, and it won't know where to find energy. This can cause a range of symptoms, including staring off into space, headaches, and irritability.
Preventing and treating keto headaches
To prevent or treat keto headaches, it is important to:
- Stay hydrated: Drink plenty of water, and limit your alcohol intake as it can be dehydrating.
- Eat nutrient-rich foods: Consume foods with enough fibre, and other nutrients.
- Get enough salt: Aim for 5,000 to 7,000 mg of sodium throughout the day, through sources like pink Himalayan sea salt, bone broth, or sodium pills.
- Increase carb intake: If symptoms persist, slightly increasing your carb intake can help reduce the effect of the low-carb diet.
Keto headaches are usually an early side effect and should subside within a week or two as your body adapts to using fats as energy.
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Dehydration, a common side effect of keto, can worsen headaches
The keto diet is a high-fat, low-carb diet that puts the body into a metabolic state called ketosis, where it burns fat instead of carbohydrates for energy. This diet can cause dehydration, which is one of its most common side effects. Dehydration can lead to headaches, and the combination of dehydration and metabolic changes can worsen them.
Causes of Dehydration on Keto
When the body enters ketosis, it starts burning through its stored form of carbs, called glycogen. This process releases water, as glycogen is bound to water molecules. As a result, people may urinate more frequently, leading to dehydration.
Additionally, the keto diet causes a drop in insulin levels, which can affect electrolytes like potassium and sodium, both of which play a key role in hydration. Lower insulin levels can cause the kidneys to release excess sodium, further contributing to dehydration.
Preventing and Treating Dehydration and Headaches on Keto
To prevent and treat dehydration and headaches while on the keto diet, staying hydrated is crucial. Aim for at least 2 liters of water per day, and limit alcohol consumption as it is a diuretic. Eating water-rich and nutrient-dense foods can also help minimize dehydration and provide essential electrolytes.
It is also important to note that intense workouts should be avoided during the initial phases of keto as they can lead to more stress on the body and may worsen dehydration and headaches.
If headaches persist beyond a few days or weeks, it is recommended to consult a healthcare professional.
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Low blood sugar can trigger migraines
Low blood sugar, or hypoglycemia, can trigger migraines. When blood glucose levels drop, people may experience symptoms such as blurry vision, increased heart rate, nervousness, fatigue, irritability, confusion, numbness, poor concentration, poor coordination, and even coma. For some people, low blood sugar manifests as a migraine.
A blood sugar level below 70 mg/dL is the benchmark for hypoglycemia, and this can cause a migraine episode. However, for people without diabetes, blood sugar would usually need to fall as low as 55 mg/dL or 3 mmol/L to trigger a migraine.
A craving for carbohydrates before a migraine episode may be the body's way of trying to regulate blood sugar and prevent the headache. Eating a high-carb meal can trigger the release of too much insulin, which helps regulate blood sugar levels. This excess insulin causes a rapid drop in blood sugar, which may trigger a migraine.
The keto diet, a high-fat, low-carb diet, can cause a drop in blood sugar, leading to keto headaches. These headaches are a common side effect of the keto diet and are caused by the metabolic changes the body undergoes when adapting to using fat instead of carbohydrates for energy. Dehydration, electrolyte imbalances, and carbohydrate withdrawal can also contribute to keto headaches.
To prevent keto headaches, it is important to stay hydrated, eat nutrient-rich foods, and avoid intense workouts.
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Carbohydrates are necessary for a healthy diet
Carbohydrates are essential for a healthy diet and should not be cut out completely. The body needs carbohydrates as they are converted into glucose, which is the body's main source of energy. When the body does not get enough carbohydrates, it goes into a state of ketosis, where it burns fat as its primary energy source instead of carbohydrates. This can lead to several adverse side effects, including headaches.
Types of Carbohydrates
Not all carbohydrates are equal, and it is important to choose healthy sources of carbohydrates. The healthiest sources of carbohydrates are unprocessed or minimally processed whole grains, vegetables, fruits, and beans. These foods provide the body with not just glucose but also vitamins, minerals, fiber, and other important nutrients.
Whole grains such as whole wheat bread, rye, barley, and quinoa are better choices than highly refined grains like white bread. Similarly, when it comes to vegetables, potatoes are high in carbohydrates and have been linked to weight gain, so it is better to opt for other starchy vegetables like peas and corn or beans and legumes like chickpeas, which also provide protein.
The amount of carbohydrates each person needs can vary depending on factors such as age, sex, health, and weight goals. On average, people should get 45 to 65% of their calories from carbohydrates every day. This equates to about 275 grams of carbohydrates per day based on a 2,000-calorie diet. However, this may be lower for those on a low-carb diet, aiming for 25 to 150 grams of carbs each day.
Carbohydrates and Headaches
Starting a low-carb diet can lead to headaches as one of the most common side effects. This is because the body is deprived of its main source of fuel, glucose, and has to adjust to using fat as its primary energy source. Additionally, low-carb diets can cause dehydration, electrolyte imbalances, and carbohydrate or sugar withdrawal, all of which can contribute to headaches.
Therefore, it is essential to include carbohydrates in your diet to maintain overall health and avoid unpleasant side effects like headaches.
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Keto headaches typically go away after the introductory phase
Headaches are a common side effect of starting a ketogenic (keto) diet. The keto diet is a high-fat, low-carb diet that puts the body in a metabolic state called ketosis, where the liver releases ketones as an alternative energy source instead of glucose. This metabolic change causes a drop in blood sugar and a sudden increase in blood acid, which can lead to headaches. Additionally, dehydration and electrolyte imbalances can also contribute to keto headaches.
The good news is that keto headaches typically go away after the introductory phase of the diet. This phase is often referred to as the “keto flu” and can last from a few days to a week. During this time, your body is going through physical carb withdrawal, and your brain is adjusting to using ketones for energy instead of glucose. The "keto flu" symptoms include headaches, brain fog, irritability, and blurred vision. However, as your body adapts to using fats as its primary energy source, these symptoms will subside, and you will enter the ketogenic state.
To help alleviate keto headaches during the introductory phase, there are several strategies you can employ:
- Stay hydrated: Drink plenty of water to prevent dehydration, which is a common trigger for headaches.
- Eat nutrient-rich foods: Consume whole, natural foods that are high in nutrients to support your body during this transition.
- Avoid intense workouts: Reduce the intensity of your workouts as your body adjusts to the new diet.
- Maintain electrolyte balance: Ensure adequate intake of sodium and potassium to prevent electrolyte imbalances, which can contribute to headaches.
- Take exogenous ketones: Consider adding exogenous ketones to your routine, as they can help elevate ketone levels and mitigate the severity of keto-induced headaches.
It is important to note that while keto headaches typically go away after the introductory phase, if you experience persistent or severe headaches, it is advisable to seek medical advice. Additionally, the keto diet may not be suitable for everyone, and it is recommended to consult a healthcare professional before starting any new diet.
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Frequently asked questions
Headaches are one of the most common side effects of starting a low-carb diet. This is because the body is forced to burn fat as its primary energy source instead of carbohydrates, causing a metabolic change. This leads to a drop in blood sugar, dehydration, electrolyte imbalances, and carbohydrate withdrawal, all of which can trigger headaches.
Yes, the headaches should subside once you reintroduce carbohydrates into your diet. Eating carbs will restore glucose, the main source of fuel for the body and brain, and help alleviate dehydration and electrolyte imbalances caused by the low-carb diet.
The duration of the headaches after reintroducing carbs may vary depending on individual factors, such as sensitivity to carbs and previous carb intake. Typically, people report symptoms lasting through the first week of starting a low-carb diet, but they can persist for up to a month. Therefore, it is reasonable to expect the headaches to resolve within a similar timeframe after resuming carb consumption.
