Intermittent fasting and keto are two of the most popular health trends today. Intermittent fasting is an eating pattern that involves cycling between periods of fasting and normal eating, with the most popular method being the 16/8 method, which involves eating during an eight-hour window and fasting for the remaining 16 hours of the day. The keto diet, on the other hand, is a high-fat, very low-carb diet that forces the body to use fats instead of glucose for energy. While both methods have been shown to be effective for weight loss, there is ongoing debate about whether they should be combined for optimal results.
Characteristics | Values |
---|---|
Intermittent Fasting | Emphasizes "when" you eat |
Keto Diet | Emphasizes "what" you eat |
Intermittent Fasting Benefits | Weight loss, improved cardiovascular health, reduced inflammation, improved brain function, improved blood sugar control, increased human growth hormone |
Keto Diet Benefits | Weight loss, improved blood sugar control, reduced risk of heart disease, treatment of epilepsy, improved mental symptoms in Alzheimer's patients |
Intermittent Fasting and Keto Combined Benefits | May lead to faster ketosis, increased fat loss |
Intermittent Fasting and Keto Combined Risks | Not suitable for pregnant or breastfeeding women, those with a history of disordered eating, or certain medical conditions |
What You'll Learn
Intermittent fasting and keto for weight loss
The ketogenic (keto) diet and intermittent fasting are two of the most popular current health trends. Both methods are used as weight-loss techniques, and studies have found that they may also benefit health in other ways.
Intermittent fasting is an eating method that cycles between periods of fasting and normal food consumption. There are several different types of intermittent fasting routines, including the 5:2 method, the Warrior Diet, and alternate-day fasting. The most popular type is the 16/8 method, which involves eating during an eight-hour window and then fasting for 16 hours.
The keto diet is a high-fat, very low-carb way of eating. Typically, carbs are reduced to 20-50 grams per day, which forces the body to rely on fats instead of glucose for energy. This metabolic process is known as ketosis, where the body breaks down fats to form substances called ketones, which are used as an alternative fuel source.
Benefits of Intermittent Fasting and Keto for Weight Loss
Combining the keto diet with intermittent fasting may offer several benefits for weight loss:
- Smooth transition into ketosis: Intermittent fasting can help the body reach ketosis faster than with the keto diet alone. During fasting, the body shifts its fuel source from carbs to fats, which is the basis of the keto diet.
- Increased fat loss: Intermittent fasting boosts metabolism and promotes the burning of stubborn fat stores. Studies have shown that intermittent fasting can lead to significant fat loss, even preserving muscle mass during weight loss.
- Reduced hunger: Intermittent fasting can reduce hunger and increase feelings of fullness, which can aid in weight loss by preventing overeating.
- Health benefits: In addition to weight loss, intermittent fasting and keto may offer other health benefits, such as improved blood sugar control, reduced risk factors for heart disease, and improved brain function.
Considerations
While combining keto and intermittent fasting may be safe for most people, it is not necessary to do both. Some people may find it too challenging or experience adverse reactions such as irritability and fatigue. Additionally, pregnant or breastfeeding women and those with a history of disordered eating should avoid intermittent fasting. It is always recommended to consult with a healthcare professional before starting any new diet or fasting protocol.
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Intermittent fasting without keto
Intermittent fasting and keto are two of the most popular health trends right now. While both have been shown to be effective for weight loss, they can be challenging to stick to and may not be suitable for everyone. So, can you do intermittent fasting without keto and still lose weight? The answer is yes!
The keto diet is a very low-carb, high-fat, and moderate-protein diet. It can be challenging to follow, especially if you lead a busy life or struggle to get enough fat in your diet. Intermittent fasting without keto simplifies mealtimes as you spend most of the day not eating. It also offers more flexibility and eliminates the stress of finding keto-friendly meals when travelling or eating out.
To do intermittent fasting without keto, pick one type of intermittent fasting program and stick to it. Popular methods include the 16:8 method (16 hours of fasting and an 8-hour feeding window) and OMAD (One Meal A Day). It's important to note that you still need to make healthy food choices during your eating window to ensure you get adequate nutrition and maintain insulin sensitivity.
While ketosis is not required to gain the health benefits of intermittent fasting, longer fasting periods will allow your body to switch to fat-burning mode while still consuming carbs, making it more sustainable. Intermittent fasting has been shown to reduce inflammation, improve brain function, and control blood sugar. It may also reduce the risk of metabolic and heart disease.
In summary, intermittent fasting without keto can be an effective way to lose weight and improve your health. It simplifies mealtimes, offers flexibility, and allows you to consume carbs, which are important for hormone function, especially in women. As with any diet or lifestyle change, be sure to consult with your healthcare provider first to ensure it is safe and suitable for you.
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The benefits of keto
The ketogenic (keto) diet is a high-fat, very low-carb way of eating. Typically, carbs are reduced to 20-50 grams per day, which forces the body to rely on fats instead of glucose for energy. This metabolic process is known as ketosis, where the body breaks down fats to form substances called ketones, which are used as an alternative fuel source.
The keto diet has been used for nearly a century to treat epilepsy and has shown promise for other neurological disorders. It has also been linked to several potential health benefits, including weight loss and improved blood sugar control.
Weight Loss
The keto diet is often touted as a weight-loss tool. It may help boost metabolism and reduce appetite, leading to reduced calorie intake and increased fat burning. Several studies have shown that people following a ketogenic diet lose more weight, often at a faster rate, compared to those on low-fat diets, even when the latter are restricting calories.
Improved Heart Health
The keto diet can lead to a significant drop in total cholesterol, low-density lipoprotein (LDL), or "bad" cholesterol, and triglycerides. At the same time, it increases high-density lipoprotein (HDL), or "good" cholesterol. By reducing cholesterol levels, the keto diet may lower the risk of cardiovascular disease.
Reduced Risk of Certain Cancers
Some research suggests that the keto diet may be beneficial as a complementary treatment for certain cancers, alongside chemotherapy and radiation therapy. This is because it causes more oxidative stress in cancer cells than in normal cells, leading to their death. Additionally, as the keto diet reduces blood sugar, it may also lower the risk of insulin-related complications linked to some cancers.
Brain Health
The ketones produced during the keto diet have been found to provide neuroprotective benefits, strengthening and protecting brain and nerve cells. This may help prevent or manage conditions such as Alzheimer's disease.
Reduced Seizures
The keto diet has been proven to reduce seizures in people with epilepsy, especially those who have not responded well to other treatments. This effect is due to the altered ratio of fat, protein, and carbs, which changes the way the body uses energy, resulting in ketosis.
Improved PCOS Symptoms
Polycystic ovary syndrome (PCOS) is a hormonal disorder that can lead to skin problems and weight gain. A high-carb diet can exacerbate these issues. The keto diet may improve several markers of PCOS, including hormone ratios and fasting insulin levels.
While the keto diet has its benefits, it is important to note that it may not be suitable for everyone and should be approached with caution. It is always advisable to consult a healthcare professional before making any significant dietary changes.
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Intermittent fasting and keto for athletes
Intermittent fasting and keto are two of the latest diets to sweep the world. Both have a good deal of science to back up the claims that they work. On their own, they can encourage effective fat loss and weight control. But what happens when you put the two together?
Intermittent fasting is a diet involving long periods of fasting and short periods of eating. There are many ways to structure the diet:
- 16 hours fasting, 8 hours eating
- 18 hours fasting, 6 hours eating
- 23 hours of fasting, 1 hour of eating (One Meal a Day)
- 48 hours of fasting per week
The purpose of this diet is to encourage better nutrient absorption and energy production. If you get all of your energy in a short eating window, you force your body to use that energy (and more) during the “fasting window”. This can lead to better activation of stored fats, in turn promoting better overall fat-burning.
The Ketogenic Diet is another diet aimed specifically at eliminating body fat. It does so by promoting a high-fat diet.
By cutting back on carbs, you provide your body with a lot of slow-burning energy. But there is another benefit of the Ketogenic Diet: you encourage better fat-burning. Seeing as fat is now your primary energy source, your body becomes more adept at utilizing fat—both the fat you put in your body in each meal and the fat already in your body. As you cut back on calorie intake, you encourage your body to activate stored fats. Add to it the improved fat-burning abilities resulting from the Keto Diet, and you have a much better chance of seeing proper fat loss (the REAL type of weight loss).
On their own, both the Ketogenic Diet and Intermittent Fasting can be highly effective. But what happens when you mix the two diets? Not only are you burning more fat, but you’re doing so for more hours per day. Your body has to access more stored fat during the fasting periods, leading to more effective fat burning overall.
The Ketogenic Diet is high in fat, which provides your body with the energy it requires during the day. By giving it more fat, you help your body to become more accustomed to burning fat—both dietary and stored. Over time, it adapts and grows more efficient at utilizing fat instead of carbs.
This is an important part of the Ketogenic Diet. By eliminating carbs, your only other source of energy, you force your body to burn fat. A Ketogenic Diet does contain some carbs (a no-carb diet isn’t good for your health), but very little. The less carbs you eat, the more your body has to depend on fat for energy, and the more fat you burn.
If you don’t get enough protein in your diet, your body will start to cannibalize your muscle mass for energy. Muscles store easy-to-burn energy, so your body will automatically tap into the more accessible energy stores before activating the hard-to-burn fats. By eating plenty of protein, you protect your muscle tissue from being broken down for energy.
This works hand in hand with the increased protein intake on a Ketogenic and Intermittent Fasting Diet. By increasing your activity—particularly your resistance training—you force your body to burn more energy. Resistance training (together with protein) protects your muscles from being broken down, ensuring that only fat (stored and dietary) is utilized for energy production.
Cutting back on calories can also help to encourage better fat burning. Your body adapts to the demands placed upon it. If you eat more than you burn, you store fat. If you eat less than you burn, you force your body to access stored fats. You don’t need to cut back on calories too much—just 200 to 300 calories per day is enough. That small calorie deficit will encourage the activation of stored fats. Thanks to the diet, your body is in a ketogenic, or “fat burning”, state. This will lead to better production of energy from your body fat.
Both diets are highly effective on their own, but utilizing them together can lead to visible fat loss. They both require a bit of adjustment—after all, your body has become used to a longer eating window and a higher carb intake. However, given time, you’ll find that the combination of these two diets can be a great way to lose not just weight, but eliminate that unwanted body fat!
Intermittent Fasting for Athletes
There's a lot of hype around intermittent fasting but not a lot of decisive data. Find out what recent scientific studies say about the potential benefits.
Our cells love to use carbohydrates as a primary source of metabolic fuel. Doing so tends to be very efficient and produces the least amount of metabolic stress and toxic byproducts. When sugars aren’t readily available, our bodies begin to convert protein and fat into sugar and then use them as primary metabolic fuels. Because sugars are preferred and continuously available thanks to modern, plentiful food, our systems have adapted so that metabolizing protein and fat becomes less efficient over time.
During prolonged endurance events, sugars are often consumed and depleted, necessitating the less efficient metabolizing of these secondary fuels. If there was a way to make those processes more efficient, an athlete would have an advantage.
Intermittent fasting has been posited as a means of doing just that. By regularly stressing the body and depriving it of readily available carbohydrates, we force our cells to utilize fats (and, to a lesser extent, protein) and maximize cellular efficiency.
But does the theory translate into reality? A lot of research has been done on intermittent fasting, and while the results have not been uniform, they are still very much worth consideration. Before discussing some of the results, it is important to first note that intermittent fasting can mean many different things. Different researchers have used wildly differing protocols (e.g., alternating fasting and eating every 24 hours, fasting for 20 hours each day or fasting for 16 hours a day), and it is not at all clear if anyone is better than any other.
Furthermore, the best studies, unsurprisingly, have been conducted on
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Intermittent fasting and keto for heart health
Intermittent fasting and keto are two of the most popular health trends. While both have solid research backing up their purported benefits, it is unclear whether combining the two is safe and effective. This article will explore the potential benefits of intermittent fasting and keto for heart health.
Intermittent Fasting
Intermittent fasting is an eating pattern that involves cycling between periods of fasting and normal eating. It restricts when or how much you eat. There are several variations of intermittent fasting, including time-restricted eating, alternate-day fasting, and whole-day fasting. Time-restricted eating involves eating only during an eight-hour window over a 24-hour period. Alternate-day and whole-day fasting involve choosing days during the week when you limit yourself to 400 to 600 calories.
Intermittent fasting has been shown to promote weight loss and may offer heart-related benefits. Short-term studies suggest that people adhere to intermittent fasting diets as well as or better than other diets. Additionally, a 2019 review article in the journal Nutrients found that intermittent fasting may reduce risk factors linked to heart disease, including diabetes, high blood pressure, unhealthy blood lipid levels, and inflammation.
Keto Diet
The keto diet, short for the ketogenic diet, is a high-fat, very low-carb way of eating. Typically, carbs are reduced to 20 to 50 grams per day, forcing the body to rely on fats instead of glucose for energy. This metabolic state is called ketosis. The keto diet was originally developed in the 1920s to help control seizures in children with epilepsy. Today, it is often used for weight loss and has been shown to have potential benefits for other neurological disorders, such as Alzheimer's disease.
The keto diet may also offer benefits for heart health. By reducing carbohydrate intake, the keto diet may lower heart disease risk factors like triglyceride levels. However, some nutrition experts express concern that the keto diet, which often includes large amounts of meat and eggs, may have negative effects on heart health.
Combining Intermittent Fasting and Keto
Some people choose to combine intermittent fasting and the keto diet to enhance weight loss and improve health. Combining the two approaches may help the body reach ketosis faster and promote greater fat loss. However, there is a lack of rigorous research on the combined approach, and it has not been proven effective for weight loss. Additionally, both intermittent fasting and the keto diet are very restrictive, and combining them may be challenging to stick to.
Before starting any new diet, it is important to consult with a healthcare professional. This is especially important for individuals with certain health conditions, such as diabetes or heart disease. While intermittent fasting and keto may offer potential benefits for heart health, more long-term research is needed to fully understand their effectiveness and safety.
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Frequently asked questions
Intermittent fasting is an eating method that cycles between periods of fasting and normal eating. It restricts when or how much you eat. One variation, time-restricted eating, involves eating only during an eight-hour window over a single day.
The keto diet is a high-fat, very low-carb way of eating. Carbs are typically reduced to 20-50 grams per day, forcing your body to rely on fats for energy instead of glucose.
Combining intermittent fasting with keto may help you reach ketosis faster and burn more fat. Intermittent fasting boosts metabolism and promotes feelings of fullness, which can aid weight loss.