The keto diet is a low-carb, high-fat eating plan that has been used for centuries to treat specific medical conditions. The diet involves limiting carb intake to up to 50 grams per day and increasing fat intake to around 70-80% of total daily calories. This shift in macronutrient ratios puts the body into a state of ketosis, where it burns fat for fuel instead of carbohydrates. While the keto diet has gained popularity as a weight loss strategy, it is not suitable for everyone and can cause side effects such as lethargy, nausea, and constipation. It is important for individuals to consult with a doctor or dietitian before starting the keto diet to ensure it is safe and appropriate for their needs.
Characteristics | Values |
---|---|
Carbohydrate intake | Up to 50 grams per day |
Fat intake | 70-80% of total daily calories |
Protein intake | 10-20% of total daily calories |
Calorie intake | 2000 calories per day |
Net carbs | Total carbs - dietary fiber - half of sugar alcohols |
Average recommended daily protein intake for a person assigned female at birth | 46 grams |
Average recommended daily protein intake for a person assigned male at birth | 56 grams |
What You'll Learn
The keto diet is a low-carb, high-fat eating plan
The keto diet involves drastically reducing carbohydrate intake and increasing fat intake, which puts the body into a state of ketosis. Normally, the body uses carbohydrates for energy, but when carb intake is limited, the body starts burning fat for energy instead. This results in the production of ketones, which can be used by the body for energy.
To stay in ketosis, a person should consume no more than 50 grams of net carbs per day. Net carbs are calculated by subtracting the amount of dietary fibre and half the amount of sugar alcohols from the total carbohydrate amount. Most green and leafy vegetables have a very low keto net carb count and can be enjoyed freely. Meat, such as beef, veal, lamb, pork, chicken, and turkey, and fish such as cod, sardines, tuna, and salmon, are also very low in net carbs.
The standard keto diet consists of 70-80% fat, 10-20% protein, and 5-10% carbohydrates. For a 2,000-calorie diet, this translates to about 165 grams of fat, 40 grams of carbohydrates, and 75 grams of protein per day.
During the transition to a keto diet, some people may experience minor side effects such as headaches, nausea, fogginess, muscle cramping, and fatigue, known as the "keto flu." However, after three to five weeks, the body adapts, and people may notice increased energy, weight loss, and reduced hunger.
It is important to note that the keto diet may not be suitable for everyone. Pregnant women, serious endurance athletes, and people managing Type 1 diabetes may have trouble with the restrictions of the keto diet. It is always recommended to consult with a doctor or dietitian before starting any new diet.
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The body switches to using fat as its primary energy source instead of glucose from carbs
The keto diet is a low-carb, high-fat eating plan that has been used for centuries to treat specific medical conditions. The body can burn fat instead of carbs (glucose) for energy, and this is the principle on which the keto diet is based. Typically, the body gets its energy from readily available carbohydrates. However, on a keto diet, the body is deprived of these carbohydrates and is forced to break down fat for energy, resulting in the formation of ketones, which can be used by the body for energy. This process is known as ketosis.
Ketosis is a state in which the body breaks down fatty acids to form ketone bodies for energy. To enter ketosis, one must eat no more than 50 grams of carbs per day, and as few as 20 grams, for several days. This is a challenging feat, as carbohydrates are present in a variety of food groups, including fruits, grains, legumes, and vegetables.
The keto diet is typically made up of 70-80% fat, 10-20% protein, and 5-10% carbohydrates. This is a drastic shift from a standard diet, which is usually made up of 50-55% carbohydrates, 20-25% protein, and 20-25% fat. On a 2,000-calorie diet, the keto diet would consist of about 165 grams of fat, 40 grams of carbohydrates, and 75 grams of protein.
The transition to a keto diet can be challenging and often comes with what is known as the "keto flu," which includes symptoms such as headaches, nausea, fogginess, muscle cramping, and fatigue. This transition period can last about three to five weeks. However, after the body adapts, one may experience increased energy throughout the day and a feeling of greater mental clarity and focus.
The keto diet is not suitable for everyone. Pregnant women, serious endurance athletes, and people managing Type 1 diabetes, as well as other conditions, may have trouble with the restrictions of a keto diet. It is important to research the diet thoroughly and consult with a doctor before starting.
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The keto diet is not a zero-carb diet
On the keto diet, you are allowed to have a maximum of 50 grams of net carbs per day, and the fewer carbs, the better. This means that by focusing on "net" rather than "total" carbs, you won't be denying your body the essential fibre it needs for proper function.
To calculate the number of net carbs in a serving, subtract the fibre content from the number of total carbs. If the food is processed, also subtract half of the sugar alcohol content.
For example, a medium-sized apple has about 25 grams of carbs. Other foods that are high in carbs and should be limited on a keto diet include wheat-based products like rice, pasta, and cereals, as well as some fruits and vegetables, bread, beans, and legumes.
On the other hand, foods that are encouraged on the keto diet and have very low net carbs include meats such as beef, veal, lamb, pork, chicken, and turkey, and fish such as cod, sardines, tuna, and salmon. Most green and leafy vegetables also have a low keto net carb count and can be enjoyed freely.
In summary, while the keto diet is a low-carb diet, it does not eliminate carbs entirely. It is important to focus on net carbs rather than total carbs to ensure your body gets the essential fibre it needs while still maintaining the state of ketosis that is crucial to the keto diet.
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The keto diet is not suitable for everyone
The keto diet is a low-carb, high-fat diet that has been used for centuries to treat specific medical conditions. In recent years, it has gained popularity as a weight-loss strategy. However, the keto diet is not suitable for everyone and comes with certain risks and side effects.
One of the biggest concerns with the keto diet is that it is highly restrictive. The standard keto diet recommends deriving 70-80% of daily calories from fat, 15-20% from protein, and less than 10% from carbohydrates. This means that people on the keto diet have to cut out entire food groups, such as grains, fruits, starchy vegetables, and legumes. Such restrictions can lead to nutrient deficiencies, especially if the diet is not carefully planned. It is important for anyone considering the keto diet to consult a healthcare professional to ensure they are meeting their nutritional needs.
The keto diet is not recommended for people with a history of disordered eating. The highly restrictive nature of the diet and strict rules can trigger unhealthy patterns and have negative effects on both physical and mental health. It is crucial for this group to consult a licensed healthcare provider and carefully evaluate the potential risks before attempting the keto diet.
The keto diet is also not suitable for pregnant or nursing women. The diet may not provide enough protein and other essential nutrients required during pregnancy and lactation. Additionally, there are concerns about the potential impact on the fetus, as the keto diet may signal food scarcity to the body, which is not ideal during pregnancy when nutrient needs are high.
People with certain medical conditions should also exercise caution or avoid the keto diet altogether. These include individuals with hypothyroidism, adrenal fatigue, gallbladder issues, gut dysbiosis, kidney damage, heart disease, liver or pancreatic conditions, and type 1 diabetes. The keto diet can negatively impact hormone production, increase the risk of bone injury and fracture, and cause other serious side effects.
Furthermore, the keto diet may not be sustainable or realistic for everyone. It is extremely strict and difficult to maintain, and it restricts healthy foods such as fresh fruits, vegetables, whole grains, and low-fat dairy. The social isolation and high cost associated with the diet can also be challenging.
In conclusion, while the keto diet may be beneficial for some people, it is not a one-size-fits-all solution. It is important to consult a healthcare professional before starting any new diet, especially one as restrictive as keto, to ensure it is safe and suitable for your individual needs and health status.
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The keto diet can be challenging to maintain
During the transition to a keto diet, it is common to experience side effects such as "keto flu," which includes symptoms like headaches, nausea, fogginess, muscle cramping, and fatigue. These side effects can last for about three to five weeks, and some people may find them challenging to tolerate. Additionally, the keto diet can be expensive, as it often requires the purchase of keto-compliant foods like red meats and nuts.
The keto diet is also associated with several potential risks and negative side effects. These include nutrient deficiencies, liver problems, kidney problems, constipation, and fuzzy thinking. The high-fat content of the diet, especially saturated fats, can increase the risk of heart disease. The diet may also cause social isolation or disordered eating due to its restrictive nature.
Furthermore, the keto diet is not suitable for everyone. It is not recommended for pregnant women, serious endurance athletes, or people managing Type 1 diabetes and other specific health conditions. The diet may also interact with certain medications, such as diabetic medication, and require adjustments. Therefore, it is crucial to consult a doctor and a registered dietitian before starting the keto diet to ensure it is safe and appropriate for your individual needs.
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Frequently asked questions
To stay in ketosis, a person can have up to 50 grams of carbs per day.
Although it may vary from person to person, generally, one should consume up to 50 grams of carbs per day to stay in ketosis.
Net carbs are the ones that get absorbed into the body. Total carbs include net carbs, fiber, and sugar alcohols.
To calculate net carbs, subtract the amount of dietary fiber and half the amount of sugar alcohols from the total number of carbs.
Meat, such as beef, veal, lamb, pork, chicken, and turkey, and fish, such as cod, sardines, tuna, and salmon, are very low in net carbs.