The ketogenic diet is a low-carb, high-fat diet that has been around since the 1920s. It was initially used to help with conditions like epilepsy and diabetes, but today, it is a popular weight loss method. The keto diet involves drastically reducing your carbohydrate intake and replacing it with fat. This reduction in carbs puts your body into a metabolic state called ketosis, where it becomes incredibly efficient at burning fat for energy. The keto diet can also lower blood sugar and insulin levels.
There are several types of keto diets, including the standard ketogenic diet (SKD), cyclical ketogenic diet (CKD), targeted ketogenic diet (TKD), and high-protein ketogenic diet. The SKD and HPKD have been researched and studied the most and are the most common, while the CKD and TKD are more advanced methods used primarily by athletes and bodybuilders.
The keto diet can be an effective way to lose weight and improve your health. Research shows that the keto diet may be as effective for weight loss as a low-fat diet. It can also help lower your risk for certain diseases, including type 2 diabetes, cancer, Alzheimer's disease, and epilepsy.
However, the keto diet can be restrictive and may not be suitable for everyone. It may be challenging to maintain and can have some negative side effects, such as increased risk of kidney stones and osteoporosis. It is important to consult with a doctor or dietitian before starting the keto diet to ensure it is safe and suitable for you.
Characteristics | Values |
---|---|
Carbohydrate Intake | Very low |
Protein Intake | Moderate |
Fat Intake | High |
Typical Fat Percentage | 70% |
Typical Protein Percentage | 20% |
Typical Carbohydrate Percentage | 10% |
Calorie Intake from Fat | 60% to 75% |
Calorie Intake from Protein | 20% to 35% |
Calorie Intake from Carbohydrates | 5% to 10% |
Typical Weight Loss | 2 to 4 pounds in the first week |
Typical Weight Loss Timeline | Slows down after the first couple of weeks |
What You'll Learn
What to eat and what to avoid
The keto diet is a low-carb, high-fat diet that can be effective for weight loss and certain health conditions. It involves drastically reducing your carbohydrate intake and replacing it with fat. This reduction in carbs puts your body into a metabolic state called ketosis, where it becomes incredibly efficient at burning fat for energy.
What to Eat
- Meat: Red meat, steak, ham, sausage, bacon, chicken, and turkey
- Fatty fish: Salmon, trout, tuna, and mackerel
- Eggs: Pastured or omega-3 whole eggs
- Butter and cream: Grass-fed butter and heavy cream
- Cheese: Unprocessed cheeses like cheddar, goat, cream, blue, or mozzarella
- Nuts and seeds: Almonds, walnuts, flaxseeds, pumpkin seeds, chia seeds, etc
- Healthy oils: Extra virgin olive oil and avocado oil
- Avocados: Whole avocados or freshly made guacamole
- Low-carb vegetables: Green veggies, tomatoes, onions, peppers, etc.
- Condiments: Salt, pepper, herbs, and spices
What to Avoid
- Sugary foods: Soda, fruit juice, smoothies, cake, ice cream, candy, etc.
- Grains or starches: Wheat-based products, rice, pasta, cereal, etc.
- Fruit: All fruit, except small portions of berries like strawberries
- Beans or legumes: Peas, kidney beans, lentils, chickpeas, etc.
- Root vegetables and tubers: Potatoes, sweet potatoes, carrots, parsnips, etc.
- Low-fat or diet products: Low-fat mayonnaise, salad dressings, and condiments
- Some condiments or sauces: Barbecue sauce, honey mustard, teriyaki sauce, ketchup, etc.
- Unhealthy fats: Processed vegetable oils, mayonnaise, etc.
- Alcohol: Beer, wine, liquor, mixed drinks
- Sugar-free diet foods: Sugar-free candies, syrups, puddings, sweeteners, desserts, etc.
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How to enter ketosis
To enter ketosis, you must reduce your carbohydrate intake and replace it with healthy fats. This reduction in carbs puts your body into a metabolic state called ketosis, where your body becomes very efficient at burning fat for energy.
- Reduce your carbohydrate intake: Eating a very low-carb diet is the most important factor in entering ketosis. Limit your net carb intake to 20-50 grams per day. The fewer carbs you eat, the more effective it is for reaching ketosis.
- Increase your physical activity: Being more physically active can help deplete your body's glycogen stores, which encourages the body to turn to fat as a source of fuel instead. Exercise also helps increase ketone production, but it may take 1-4 weeks for your body to adapt to using ketones and fatty acids as primary fuel sources.
- Increase your healthy fat intake: Consuming plenty of healthy fats can boost your ketone levels and help you reach ketosis. Healthy fats include fatty fish, olive oil, avocado oil, and nuts.
- Try intermittent fasting: Intermittent fasting can help you reach ketosis by depleting your body's glycogen stores. You can start with a 12-hour fast and combine it with exercise for best results.
- Maintain adequate protein intake: It is important to consume enough protein to supply your liver with amino acids that can be used for gluconeogenesis. However, excessive protein intake can be converted into glucose, preventing the ketosis state.
- Test your ketone levels: You can use blood, urine, or breath tests to measure your ketone levels and confirm that you are in ketosis.
- Consume more MCT oil: Medium-chain triglycerides (MCTs), found in MCT oil and coconut oil, can help increase ketone levels and may be especially beneficial for people with Alzheimer's disease and other nervous system disorders.
Entering ketosis can take some work and planning. It usually takes 3-4 days of a low-carb diet to reach ketosis, but this can vary depending on factors such as metabolism, physical activity levels, age, body composition, sleep habits, and stress levels.
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Weight loss effects
The keto diet is a low-carb, high-fat diet that has been proven to be effective for weight loss. It involves drastically reducing your carbohydrate intake and replacing it with fat. This reduction in carbs puts your body into a metabolic state called ketosis, where it becomes incredibly efficient at burning fat for energy.
The keto diet has been shown to be an effective way to lose weight and lower the risk of certain diseases. Research has shown that the keto diet may be as effective for weight loss as a low-fat diet. One review of 13 studies found that following a very low-carb, ketogenic diet was slightly more effective for long-term weight loss than a low-fat diet. People who followed the keto diet lost an average of 2 pounds more than the group that followed a low-fat diet.
Another study in 34 older adults found that those who followed a ketogenic diet for 8 weeks lost nearly five times as much total body fat as those who followed a low-fat diet. The increased ketones, lower blood sugar levels, and improved insulin sensitivity may also play a key role in weight loss.
The keto diet can also help with fat loss, especially unhealthy abdominal fat, which is one of the criteria for metabolic disease. It promotes the loss of body fat by increasing fat burning and reducing calorie intake. It also improves insulin sensitivity, which can help improve fuel utilization and metabolism.
However, it's important to note that the keto diet may not be suitable for everyone. It can be challenging to maintain and may not be sustainable for some people's lifestyles and preferences. Additionally, it may not be the best option for elite athletes or those wishing to build large amounts of muscle. It's important to speak to your doctor before starting the keto diet to ensure it's safe and suitable for you.
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Health benefits
The keto diet is a low-carb, high-fat diet that has been shown to have many health benefits. Here are some of the health benefits of the keto diet:
- Weight Loss: The keto diet is an effective way to lose weight and lower the risk of diseases. Studies have shown that the keto diet can lead to significant weight loss, especially in the abdominal cavity, which is linked to serious metabolic problems.
- Improved Blood Sugar and Insulin Levels: The keto diet can help lower blood sugar and insulin levels, which is beneficial for people with diabetes and insulin resistance. It may even help reverse type 2 diabetes.
- Reduced Risk of Certain Cancers: The keto diet may help prevent or treat certain cancers by causing more oxidative stress in cancer cells than in normal cells. It also reduces blood sugar, which lowers the risk of insulin-related complications.
- Improved Heart Health: The keto diet can improve heart health by reducing cholesterol levels. It lowers triglycerides and increases "good" HDL cholesterol.
- Protection Against Brain Disorders: The keto diet has been shown to improve brain function and protect against conditions such as Alzheimer's disease and epilepsy. It may also have potential benefits for other brain conditions such as Parkinson's disease.
- Improved Polycystic Ovary Syndrome (PCOS) Symptoms: The keto diet can help reduce insulin levels, which play a key role in PCOS. It can also help improve other markers of PCOS, such as luteinizing hormone and fasting insulin levels.
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Side effects and risks
The keto diet is generally safe, but there are some side effects and risks to be aware of.
Side Effects
The keto diet may cause what is commonly referred to as the "keto flu". Symptoms include:
- Diarrhea
- Constipation
- Vomiting
- Poor energy and mental function
- Digestive discomfort
- Decreased exercise performance
- Headaches
- Dizziness
- Fatigue
- Nausea
These symptoms are usually temporary and often disappear within a few days or weeks.
Risks
The keto diet may also pose the following risks:
- Nutrient deficiencies: The diet restricts several nutrient-dense foods, such as fruits, whole grains, and legumes, and may not provide sufficient amounts of vitamins and minerals like calcium, vitamin D, magnesium, and phosphorus.
- Kidney problems: The high intake of animal foods and protein on the keto diet may increase the risk of kidney stones and overload the kidneys.
- Constipation: The diet is low in fibrous foods, which can lead to constipation.
- Fuzzy thinking and mood swings: Low-carb diets may negatively impact brain function, causing confusion and irritability.
- Heart disease: The keto diet is associated with an increase in "bad" LDL cholesterol, which is a risk factor for heart disease.
- Liver problems: The high-fat content of the keto diet could worsen existing liver conditions.
- Bone health: Animal studies suggest that the keto diet may decrease bone strength and bone mineral density.
- Chronic diseases and early death: Some evidence indicates that high-fat, low-carb diets focusing on animal foods may increase the risk of heart disease, cancer, and all-cause mortality.
- Low blood sugar: Low-carb diets may increase the risk of hypoglycemic episodes, especially in individuals with type 1 diabetes.
It is important to consult a healthcare professional before starting the keto diet, especially if you have any pre-existing medical conditions.
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Frequently asked questions
The keto diet is a high-fat, low-carb diet that forces your body to use fat as its main source of energy instead of glucose.
On the keto diet, you drastically reduce your carbohydrate intake, limiting your body's supply of glucose (sugar). This puts your body into a metabolic state called ketosis, where it burns fat for fuel and turns fat into ketones in the liver.
The keto diet involves eating high-fat foods such as meat, fish, eggs, nuts, and healthy oils, as well as low-carb vegetables. You should avoid carb-rich foods like grains, sugars, legumes, starchy vegetables, and most fruits.