Brenda Khan
The ketogenic (keto) diet is a high-fat, very low-carbohydrate, and moderate-protein diet. The keto diet works by getting your body to change the fuel it uses for energy. Normally, carbohydrates from your food are broken down into glucose, which is the body's main source of energy. But when you eat fewer carbs, your body starts to use fat as energy instead by turning it into substances called ketones. This is called ketogenesis, and it usually begins about 3 to 4 days after you start restricting your carb intake.
| Characteristics | Values |
|---|---|
| Carbohydrates | Very low |
| Proteins | Moderate |
| Fats | High |
| Food | Meat, fish, eggs, nuts, healthy oils, non-starchy vegetables, berries, high-fat dairy products, olive oil, and high-cocoa chocolate |
| Benefits | Weight loss, increased energy, improved insulin sensitivity, reduced seizures in children with epilepsy, reduced blood sugar levels |
| Side Effects | Fuzzy thinking, mood swings, constipation, dehydration, low bone density, high cholesterol, kidney stones, kidney problems |
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High-fat foods
The keto diet is a high-fat, low-carbohydrate, and moderate-protein diet. It is designed to force the body to use a different type of fuel, changing its source of energy from carbohydrates to fat. This metabolic state is known as ketosis, where the body burns fat for fuel instead of carbohydrates.
There are several healthy and nutritious high-fat foods that can be incorporated into the keto diet. These include:
- Oily fish, such as salmon, tuna, sardines, and mackerel, which are rich in omega-3 fats and have anti-inflammatory effects.
- Meat and poultry, preferably grass-fed, with the skin on to increase the fat content.
- Eggs, especially whole eggs, as the yolk contains most of the egg's nutrients, including antioxidants that promote eye health.
- High-fat dairy products, such as butter, cheese, and coconut or nut butter, which can be used in cooking or as spreads.
- Avocados, which are a good source of healthy fats and can be easily incorporated into meals or eaten as a portable snack.
- Nuts and seeds, such as chia seeds, which are generally low in carbohydrates and high in fiber, vitamins, and minerals.
- Healthy oils, including olive oil and avocado oil, which can be used for cooking or as salad dressings.
- Dark, leafy greens, such as spinach, kale, and collard greens, which are low in carbohydrates and packed with vitamins and minerals.
- Low-carb vegetables, such as bell peppers, broccoli, zucchini, and asparagus.
- Berries, in small portions, as they are lower in carbohydrates than other fruits.
While the keto diet emphasizes high-fat foods, it is important to prioritize healthy fats and avoid excessive consumption of saturated fats and trans fats, which have been linked to an increased risk of heart disease.
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Low-carb foods
A ketogenic diet is a very low-carb, high-fat, and moderate-protein diet. The aim is to force the body to use a different type of fuel. Instead of relying on glucose, which comes from carbohydrates, the keto diet relies on ketone bodies, which the liver produces from stored fat.
Low-carb diets can be challenging, as many high-fibre foods, such as whole grains, legumes, and certain fruits, are also high in carbs. It is important to eat plenty of vegetables that are high in fibre, such as leafy greens (kale, spinach, Swiss chard, collard greens), broccoli, cauliflower, peppers, onions, garlic, mushrooms, cucumber, celery, and summer squashes.
Other low-carb foods include:
- Fish and shellfish, such as salmon, shrimp, and lobster, which are very low in carbs and high in essential nutrients like omega-3 and B vitamins.
- Meat and poultry, which are high in fat and very low in carbs, although these should be eaten in moderation due to links with heart disease and type 2 diabetes.
- Eggs, which are a great source of protein and contain less than 1 gram of carbs per large egg.
- Nuts and seeds, which are often eaten as snacks and can add crunch to salads or recipes.
- High-fat dairy products, although those with dairy intolerances should avoid these.
- Fats and oils, which contain no carbs at all.
- Most sugar-free beverages.
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Moderate-protein foods
A ketogenic (keto) diet is a high-fat, very low-carbohydrate, and moderate-protein diet. It is a medical diet advertised as a weight-loss plan that comes with serious risks. The keto diet works by getting your body to change the fuel it uses for energy. Typically, carbohydrates from food are broken down into glucose, which is the body's main source of energy. However, when you eat fewer carbs, your body starts to use fat as energy instead by turning it into substances called ketones. This is called ketogenesis and usually begins about 3 to 4 days after you start restricting your carb intake.
The keto diet is a tricky one as it requires you to deprive yourself of carbohydrates, allowing for fewer than 20 to 50 grams of carbs per day. To put this into perspective, a medium-sized banana has about 27 grams of carbs.
The following are examples of moderate-protein foods that can be eaten on a keto diet:
- Fish and seafood: Salmon and other fish are not only nearly carb-free but also rich in B vitamins, potassium, and selenium.
- Meat and poultry: These are high in fat and very low in carbs. However, it is important to eat these in moderation as they have been linked to health conditions like heart disease, type 2 diabetes, and excess weight.
- Non-starchy vegetables: These include bell peppers, broccoli, zucchini, cauliflower, asparagus, Brussels sprouts, celery, and summer squashes.
- Eggs: Each large egg contains less than 1 gram of carbs and about 6 grams of protein, making them ideal for keto.
- High-fat dairy products: These include cheese, butter, and cream.
- Oils: These include olive oil and other oils.
- Nuts and seeds: These are a good source of healthy fats and protein.
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Weight loss
The ketogenic diet, commonly known as the keto diet, is a high-fat, very low-carbohydrate, and moderate-protein diet. It is advertised as a weight-loss wonder, but it is actually a medical diet that comes with serious risks.
The keto diet works by getting your body to change the fuel it uses for energy. Typically, carbohydrates from food are broken down into glucose, which is the body's main source of energy. However, when you eat fewer carbs, your body starts to use fat as energy instead by turning it into substances called ketones. This is called ketogenesis, and it usually begins about 3 to 4 days after you start restricting your carb intake.
The ketogenic diet has been shown to produce beneficial metabolic changes in the short term. Along with weight loss, health parameters associated with carrying excess weight have improved, such as insulin resistance, high blood pressure, and elevated cholesterol and triglycerides. There is also growing interest in the use of low-carbohydrate diets, including the ketogenic diet, for type 2 diabetes.
Some studies have suggested that a ketogenic diet may be more effective than a low-fat diet for weight loss, even when the total calorie intake is matched. In one older study, people on a ketogenic diet lost 2.2 times more weight than those on a low-calorie, low-fat diet. Triglyceride and HDL (good) cholesterol levels also improved.
However, it is important to note that the keto diet has some risks. It is high in saturated fat and has been linked to an increase in "bad" LDL cholesterol, which is associated with heart disease. The diet is also low in fibrous foods like grains and legumes, which can lead to constipation and may overload the kidneys. Additionally, low-carb diets may cause confusion and irritability as the brain works best when its energy source is sugar from healthy carbohydrates.
Before starting the keto diet or any other weight-loss plan, it is important to consult with a healthcare professional to ensure it is safe and appropriate for your individual needs.
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Health benefits
A ketogenic diet, or keto diet, is a high-fat, very low-carbohydrate, and moderate-protein diet. It is a medical diet that is advertised as a weight-loss wonder, but it also comes with serious risks. The keto diet works by getting your body to change the fuel it uses for energy. Instead of relying on sugar (glucose) from carbohydrates, the keto diet relies on ketone bodies, a type of fuel that the liver produces from stored fat. This metabolic state is referred to as "nutritional ketosis."
The keto diet has been shown to be effective in rapid weight loss, especially for people with obesity, metabolic syndrome, insulin resistance, and type 2 diabetes. By reducing glucose intake and improving insulin sensitivity, the keto diet can enhance glucose control and help with weight reduction, particularly in abdominal obesity and insulin resistance. It may also help improve blood pressure, blood glucose regulation, and HDL cholesterol levels.
The keto diet can also help reduce seizures in children with epilepsy, and it is being studied for its potential benefits in reducing symptoms for patients with progressive neurological disorders like Parkinson's disease. Additionally, the keto diet may provide benefits in reducing the risk of certain diseases, including type 2 diabetes, hyperlipidemia, heart disease, and cancer.
While the keto diet allows for high-fat intake, it is important to prioritize healthy fats like monounsaturated and polyunsaturated fats found in olive oil, avocado, and fatty fish to promote heart health. It is also crucial to make sure you get enough fiber, as the keto diet can be low in fibrous foods.
Intermittent fasting is an approach that allows you to receive the benefits of ketosis while still eating a varied and balanced diet. By cycling between periods of eating and fasting, your body enters "mild ketosis" during the fasting phase. This provides the flexibility to maintain a long-term, balanced diet while supporting metabolic health, weight management, and cellular repair.
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Frequently asked questions
The keto diet is a low-carb, high-fat, and moderate-protein diet. 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 burns fat for energy instead of glucose.
The keto diet is advertised as a weight-loss solution and is said to provide numerous health benefits. It can help burn fat and make you feel less hungry. It has also been shown to increase your focus and energy, and it delivers your body's energy needs in a way that reduces inflammation.
The keto diet includes fish and seafood, meat and poultry, non-starchy vegetables like broccoli, avocados, berries, nuts and seeds, eggs, high-fat dairy products, olive oil and other oils, and high-cocoa chocolate.
The keto diet is associated with an increase in "bad" LDL cholesterol, which is linked to heart disease. It may also cause kidney problems, fuzzy thinking, and mood swings. It can be difficult to follow and may produce side effects like "keto" breath, constipation, dehydration, and low bone density.
Signs of ketosis may include increased thirst, dry mouth, frequent urination, decreased hunger, and fatigue. Blood, urine, and breath tests are available to measure the amount of ketones produced by your body.
