Leena Watts
The ketogenic diet, or keto for short, is a high-fat, moderate-protein, and low-carbohydrate diet that has gained popularity as a weight-loss method. The goal of the keto diet is to induce ketosis, a metabolic state where the body burns fat for energy instead of carbohydrates, leading to weight loss. The diet was first introduced in the 1920s as a treatment for epilepsy and has since been found effective for other health conditions, including type 2 diabetes. Before starting keto, it is important to understand the potential side effects, such as the keto flu, and to consult with a healthcare professional, especially if you have existing health conditions or dietary restrictions. To begin, one should gradually reduce carbohydrate intake, increase healthy fats, and focus on nutrient-dense foods like meat, fish, eggs, nuts, and low-carb vegetables. Meal planning, familiarizing oneself with food labels, and seeking expert advice from dietitians can also aid in successfully starting a ketogenic diet.
Characteristics and Values of a Ketogenic Diet
| Characteristics | Values |
|---|---|
| Purpose | Weight loss, treatment for epilepsy, diabetes, cancer, and dementia |
| Food Groups | High-fat, moderate protein, low-carb |
| Food Examples | Meat, fish, eggs, nuts, oils, avocados, low-carb vegetables |
| Food to Avoid | Grains, wheat, sugar, fruit, candy, chocolate, processed food |
| Side Effects | Keto flu, constipation, diarrhoea, lethargy, mental fog, vitamin and mineral deficiencies |
| Tips | Familiarise yourself with food labels, plan meals, seek expert advice, ease into the diet |
| Variations | Cyclical Ketogenic Diet (CKD), Targeted Ketogenic Diet (TKD), High-Protein Ketogenic Diet (HPKD) |
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What You'll Learn
Understanding ketosis and how it works
Ketosis is a metabolic state in which the body uses fat as its main source of energy instead of glucose. Typically, carbohydrates in your diet provide most of the fuel your body needs. However, when your body doesn't have enough carbohydrates to burn for energy, it burns fat and makes ketones, which it can use for fuel.
Ketosis can be achieved by eating no more than 20–50 grams of carbohydrates per day. This may vary depending on the individual. The exact number of carbs needed to enter ketosis is also dependent on the person's exercise routine, as the body can burn through stored glucose during exercise, allowing it to start burning ketones for fuel.
Ketosis has been shown to increase focus and energy, and it is thought to help people lose weight in two main ways. Firstly, it encourages the body to burn fat for energy, leading to weight loss without the loss of muscle mass. Secondly, ketosis may suppress appetite, so individuals on a ketogenic meal plan are less likely to overeat.
Ketosis may have several health benefits, such as improved blood sugar management and fewer seizures in children with epilepsy. However, the ketogenic diet can be difficult to follow and may not be suitable for everyone. It may also produce side effects, including ""keto" breath, constipation, dehydration, and fatigue.
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The different types of keto diets
The ketogenic diet, or keto, is a high-fat, moderate-protein, and low-carbohydrate diet that has gained popularity as a weight-loss method. It was first introduced in the 1920s as a treatment for epilepsy and has since been found to have several health benefits, including improved blood glucose control, heart health, and reduced seizures in epileptic children.
There are several types of keto diets, each with slight changes in the proportion of fat, protein, and carbohydrates. Here are some of the most common types:
- Standard Ketogenic Diet (SKD): This is the most common form of the keto diet, involving a very low-carb, moderate-protein, and high-fat approach. Typically, it consists of 70% fat, 20% protein, and 10% carbohydrates. It is designed to bring about ketosis, where the body breaks down body fat into ketones, using them as fuel instead of glucose.
- Cyclical Ketogenic Diet (CKD): This version involves periods of higher-carb intake, such as five ketogenic days followed by two high-carb days. It is intended for athletes to replenish glycogen lost during workouts.
- Targeted Ketogenic Diet (TKD): The TKD is similar to the SKD but allows for the addition of carbohydrates around intense workouts. It is a compromise between the SKD and CKD, providing a more flexible approach for athletes and bodybuilders.
- High-Protein Ketogenic Diet (HPKD): This variation is similar to the SKD but includes more protein, with a typical ratio of 60% fat, 35% protein, and 5% carbohydrates.
- Modified Atkins Diet: This is a more flexible version of the classic ketogenic diet, restricting carbohydrate intake to 10-20 grams per day but without limiting protein.
- Low Glycemic Index Treatment (LGIT): The LGIT is a flexible ketogenic diet used worldwide for improved seizure control.
- Clean Keto: This version focuses on sourcing the healthiest versions of foods while maintaining the same macronutrient distribution as the standard keto diet.
It is important to note that the keto diet may not be suitable for everyone, and consulting a licensed dietitian or a healthcare professional is recommended before starting any new diet, especially if you have pre-existing health conditions.
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What to eat and what to avoid
The ketogenic, or keto, diet is a low-carb, high-fat diet that has gained popularity as a weight-loss method. It was first introduced in the 1920s as a treatment for epilepsy and diabetes.
What to Eat
The keto diet is a high-fat, moderate-protein, and low-carbohydrate diet. The standard ketogenic diet (SKD) typically contains 70% fat, 20% protein, and only 10% carbohydrates. This means that you can eat foods such as:
- Meat and poultry: These are staple foods on the keto diet as they contain no carbs and are rich in B vitamins and minerals. They are also good sources of high-quality protein, which may help preserve muscle mass.
- Fish and shellfish: Salmon, sardines, mackerel, and albacore tuna are all good options as they are carb-free and high in omega-3 fats.
- Eggs: One large egg contains very few carbs and is also a good source of protein.
- Cheese: Most types of cheese are very low in carbs and high in fat, making them a great fit for the keto diet.
- Non-starchy vegetables: These are low in calories and carbs but high in nutrients like vitamin C and minerals. Examples include broccoli, spinach, tomatoes, and avocados.
What to Avoid
When on the keto diet, it is important to avoid high-carb foods and limit your carbohydrate intake to only 5-10% of your daily diet. This includes avoiding foods such as:
- Breads
- Pasta
- Potatoes
- Sugary foods and drinks
- High-carb fruits: Some fruits, like bananas and apples, are high in carbs and natural sugars, so they should be avoided or limited.
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Potential side effects and risks
The ketogenic diet has been associated with several health benefits, especially for type 2 diabetes. However, it also comes with certain risks and side effects.
One of the most common side effects of the keto diet is "keto flu", which includes symptoms such as fatigue, headache, dizziness, nausea, vomiting, constipation, and low exercise tolerance. These symptoms usually go away after a few days or weeks as the body adjusts to the diet.
The keto diet has also been linked to impaired bone health. Several studies have found that the keto diet is associated with decreased bone mineral density and increased levels of blood markers for bone breakdown. The keto diet may also lead to digestive issues, such as constipation and hemorrhoids, due to the restriction of high-fiber foods.
Additionally, the keto diet may increase the risk of kidney stones, as it can make urine more acidic. It can also worsen chronic kidney disease. The keto diet has been shown to increase cholesterol levels, which may lead to accelerated atherosclerosis and increased risks associated with cardiovascular disease.
Furthermore, the keto diet may not be suitable for everyone. It is considered relatively safe for adults but may not be safe for children, especially those with certain metabolic disorders. It is important to consult with a healthcare professional before starting the keto diet to ensure it is right for your individual needs and health status.
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Long-term maintenance and lifestyle changes
The keto diet is not meant to be a forever diet, and experts recommend keeping it short-term. However, if you plan to stay on the keto diet long-term, there are some things you should keep in mind. First, it's important to remember that the keto diet is not a one-size-fits-all plan, and your target macros will depend on factors such as your sex, body weight, health concerns, and performance goals. You can calculate your macros for the SKD and modify them to target your goals. A typical macro ratio for the SKD is 70% fat, 20% protein, and 10% carbs. However, you can use calculator apps or seek the help of a licensed dietitian or personal trainer to determine the best macros for you.
Additionally, the keto diet can be challenging to maintain due to its restrictive nature. It's important to eat until you're full and not restrict calories too much, as the keto diet typically causes weight loss without intentional calorie restriction. To stay in ketosis, you need to burn through all the carbs you eat by exercising enough. You can use urine, blood, and breath tests to test your ketone levels and ensure you're achieving ketosis.
Furthermore, the keto diet can lead to some side effects, such as the ""keto flu," which can cause lethargy, mental fog, constipation, or diarrhea. These side effects typically occur when your body is adjusting to burning fat for energy. To manage this, you should pick a start date when you have fewer obligations and can rest as needed. It's also recommended to take it easy with exercise for the first week or two as your body adjusts.
In the long term, the keto diet may also lead to vitamin and mineral deficiencies, so it's important to talk to your doctor about any supplements you should consider. MCT oil, added salt, minerals, caffeine, and exogenous ketones are some supplements that can be beneficial on the keto diet.
Finally, while you can slowly reintroduce carbs after achieving your primary goal, you should not return to eating the way you did before. The keto diet requires a lifestyle change, and you must be mindful of your carb intake to maintain your results.
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Frequently asked questions
A ketogenic diet, or keto, is a high-fat, moderate-protein, and low-carbohydrate diet. It was first introduced in the 1920s as a treatment for epilepsy and diabetes. Today, it is a popular weight-loss method.
You can eat meat, fish, eggs, butter, nuts, healthy oils, avocados, and low-carb vegetables. It is important to avoid grains, wheat products, sugar, and processed foods.
The ketogenic diet has been shown to be effective in treating epilepsy, especially when medications are not working or have side effects. It has also been shown to reverse type 2 diabetes in some cases and help with weight loss.
Yes, the "keto flu" is a common side effect when starting the diet, causing lethargy, mental fog, and constipation or diarrhea. It is important to consult a doctor before starting, especially if you have dietary restrictions or take medication for diabetes. The diet can also cause vitamin and mineral deficiencies, so supplements may be needed.
It is recommended to start by familiarizing yourself with food labels and calculating your target macros based on factors like sex, body weight, and goals. You can then plan meals and find keto-friendly recipes. Gradually reduce carbohydrates and increase healthy fats in your diet.
