Leena Watts
The ketogenic, or keto, diet is a low-carbohydrate, high-fat eating plan that has gained popularity in recent years. The keto diet involves drastically reducing carbohydrate intake and replacing those calories with fat, which supplies as much as 90% of daily calories. This reduction in carbs puts the body into a metabolic state called ketosis, where it burns fat for fuel instead of glucose. While some people have found success with the keto diet, it is not without its drawbacks and risks. It can be challenging to sustain in the long term, and it can also lead to negative side effects such as constipation, nutrient deficiencies, and increased risk of heart disease. Ultimately, while the keto diet may be a viable option for some, it is important to carefully consider the potential benefits and risks before making any significant dietary changes.
| Characteristics | Values |
|---|---|
| Carbohydrate intake | Generally, stay under 20 to 50 grams of carbohydrates per day. However, some people aim for 20 to 40 grams, while others can go as low as 10 grams or as high as 60 grams. |
| Food choices | Non-starchy vegetables, berries, cheese, fish, nuts, seeds, avocados, tofu, olive oil, and fatty meats are allowed. Starchy vegetables like carrots and peas, fruits, grains, legumes, and foods containing sugar and trans fats should be avoided. |
| Health risks | The keto diet is associated with an increased risk of heart disease, kidney stones, gout flares, nutrient deficiencies, and negative impacts on mental health. It can also be difficult to sustain in the long term. |
| Weight loss | The keto diet has been linked to weight loss, but this may not be sustainable, as dieters often gain weight back when they start eating carbohydrates again. |
| Medical uses | The keto diet has been used to treat epilepsy, especially in children who don't respond to medication. It is also being studied for potential benefits in brain disorders like Parkinson's disease. |
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What You'll Learn
Carb intake on keto
The keto diet is a low-carb, high-fat diet that involves reducing carbohydrate consumption and replacing it with fat. This reduction in carbs puts the body into a metabolic state called ketosis, where it burns fat for energy instead of glucose. While on a keto diet, it is recommended to consume between 20 and 50 grams of carbohydrates per day. However, the exact amount needed to achieve ketosis can vary from 10 to 60 grams per day and depends on individual factors such as activity levels.
To stay within the recommended carb range, it is important to choose low-carb food options. Non-starchy vegetables, such as broccoli, cauliflower, and bell peppers, are good choices as they are low in carbs and high in fibre, which helps prevent constipation, a common side effect of the keto diet. Berries are also a lower-carb fruit option, but portions should be kept small. Nuts are another suitable snack option, as they provide healthy fats and fibre, which lowers their net carb count.
It is important to note that the keto diet can be restrictive and may not include many carb options besides vegetables and small amounts of berries. Additionally, the diet may not be sustainable in the long term, and some people may experience negative side effects such as "keto flu," which includes symptoms like fatigue, irritability, nausea, and constipation. It is always recommended to consult with a healthcare professional before starting any new diet, especially one as restrictive as keto.
While on the keto diet, it is crucial to monitor your fat intake as well. Since the diet is high in fat, prioritizing healthy fats such as monounsaturated and omega-3 fats is essential. The keto diet is associated with increased "bad" LDL cholesterol and a higher risk of heart disease, so it is important to be mindful of saturated fat intake.
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High-carb foods to avoid
The keto diet is a low-carb, high-fat diet that involves drastically reducing your carbohydrate intake and replacing those calories with fat. While there is no strict definition of a low-carb diet, anything under 100-150 grams of carbohydrates per day is generally considered low-carb. However, to enter ketosis, which is essential for a ketogenic diet, most people will need to consume fewer than 50 grams of carbohydrates per day.
Starchy Vegetables
Vegetables such as corn, potatoes, sweet potatoes, beets, carrots, and peas are starchy and contain more digestible carbohydrates than fibre. While these vegetables offer nutritional benefits, they are high in carbs and should be limited on the keto diet.
Fruits
Fruits are naturally high in carbohydrates. Limit high-sugar fruits, which cause a rapid spike in blood sugar and have more carbohydrates. Berries are a lower-carb option, but portions should still be kept low. Fruit juices, even 100% natural ones, are also high in fast-digesting carbs and should be avoided.
Dairy
Milk is an excellent source of calcium and vitamin D, but it also contains sugar (lactose). One cup of milk contains 12 grams of sugar. Opt for unsweetened almond milk or other low-carb milk alternatives instead. Plain Greek yogurt is a better choice than regular yogurt, as it is higher in protein and lower in carbohydrates.
Legumes and Grains
Beans and legumes are high in fibre and protein but are also rich in carbohydrates. They may be included in small amounts on a ketogenic diet, but they can quickly add up to a large percentage of your daily carb intake. Grains like quinoa and millet are also high in carbohydrates and may not fit into a keto diet.
Processed Foods
Cereal, crackers, rice, pasta, bread, and beer are high in carbohydrates and should be avoided or limited on the keto diet. Gluten-free baked goods can also be high in carbs, so they are not necessarily a better option. Instead, opt for low-carb alternatives like spiralized vegetables or shirataki noodles.
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Low-carb alternatives
A ketogenic diet is a very low-carb, high-fat diet. The number of grams of net carbohydrates consumed per day varies from person to person, but generally, people on a keto diet consume 20 to 50 grams of net carbohydrates per day.
Bread
- Cloud bread, or oopsie bread, is a protein-rich alternative to regular bread. It is made from eggs and tastes similar to a soufflé omelette.
- Ezekiel bread is another alternative to regular bread.
- Eggplant disks can be used as a replacement for bread slices in sandwiches.
Pasta
- Spiralized vegetables, such as zucchini pasta, are a low-carb alternative to regular pasta.
- Shirataki noodles are another low-carb option.
- Spaghetti squash is a great alternative to pasta. Simply cut the squash in half, bake it, and use a fork to pull out the naturally forming spaghetti-like strands.
Rice
Cauliflower rice is a low-carb substitute for rice.
Pizza
A cauliflower pizza base can be made by mixing cauliflower rice with egg and ground almonds and baking the mixture.
Meat
- Tofu can be used as a substitute for meat in dishes such as curries and stir-fries.
- Canned meats can be used as a substitute for fresh meat.
Snacks
- Nuts are a great source of fiber and can be eaten as a snack.
- Cheese is high in fat and has zero carbohydrates, making it an excellent fit for the ketogenic diet.
- Berries are a good lower-carb fruit option.
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Keto diet risks
The keto diet is a popular, strict, and difficult-to-maintain diet that has been advertised as a weight-loss solution. However, it comes with serious risks and should not be treated as an experiment.
To achieve ketosis, the diet requires 75% of calories to come from fat, 5% from carbohydrates (20-50 grams per day), and 15% from protein. This extreme carbohydrate restriction can lead to a lack of vitamins, minerals, fiber, and phytochemicals found in fruits, vegetables, whole grains, and legumes. As a result, individuals on low-carbohydrate diets are at risk of nutritional deficiencies and constipation.
The keto diet could also cause low blood pressure, kidney stones, nutrient deficiencies, and an increased risk of heart disease. Strict diets like keto could also lead to social isolation or disordered eating. Those who are new to the keto diet may experience the "keto flu," with symptoms like an upset stomach, dizziness, decreased energy, and mood swings.
The keto diet is not recommended for individuals with type 1 diabetes due to the risk of malnutrition, failure to thrive, reduced bone density, hyperlipidemia, poor sleep, amenorrhea, and hypoglycemia. It can also adversely affect mood and behavior.
The keto diet is primarily used to manage seizures in children with epilepsy. Research on its effectiveness in treating obesity or diabetes is limited, and it is not a sustainable long-term solution for weight loss.
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Keto diet side effects
The keto diet is a low-carb, high-fat diet that can lead to a metabolic state called ketosis, where the body burns fat for energy instead of glucose. While the keto diet has been linked to weight loss and other benefits, it also has several side effects and can be challenging to maintain.
One of the most common side effects is "keto flu," which includes symptoms such as an upset stomach, headache, fatigue, dizziness, decreased energy, and mood swings. These symptoms occur when the body adapts to ketosis and can last for a few weeks. Other side effects may include bad breath, constipation, dehydration, low bone density, high cholesterol, and kidney stones.
The keto diet restricts many healthy foods, including fruits, starchy vegetables, whole grains, and low-fat dairy. It can be difficult to get adequate nutrition and may lead to nutrient deficiencies. The diet is also typically high in saturated fat and sodium, which can increase the risk of heart disease.
The keto diet is extremely strict and may not be sustainable or realistic for most people. It can also lead to social isolation and disordered eating. Additionally, the keto diet may not be safe for individuals with certain medical conditions involving the pancreas, liver, thyroid, or gallbladder.
Furthermore, the long-term effects of the keto diet on the risk of chronic illnesses, such as heart disease and cancer, are not well understood. Some evidence suggests that high-fat, low-carb diets focusing on animal foods may lead to poor health outcomes, while diets emphasizing vegetable sources of fats and proteins may provide benefits.
It is always recommended to consult a healthcare professional before starting any new diet, especially one as restrictive as the keto diet.
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Frequently asked questions
A keto diet is a 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 from carbohydrates, the keto diet relies on ketone bodies, which are produced by the liver from stored fat.
Most sources recommend staying under 20 to 50 grams of carbohydrates per day. However, the exact amount needed to achieve ketosis can vary from 10 to 60 grams per day and depends on individual factors such as activity levels.
Foods that are high in carbohydrates and should be avoided or limited on a keto diet include cereal, crackers, rice, pasta, bread, beer, starchy vegetables like peas and carrots, and fruits like bananas.
Low-carb food options for a keto diet include non-starchy vegetables like broccoli, cauliflower, and bell peppers, fatty fish like salmon and sardines, cheese, nuts, and berries in small portions.
The keto diet is associated with an increased risk of "bad" LDL cholesterol and heart disease due to its high saturated fat content. It can also lead to nutrient deficiencies, constipation, dehydration, kidney stones, and "keto flu" symptoms such as brain fog, irritability, nausea, and fatigue.
