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Is Intermittent Fasting Bad For You

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How To Do It

Is Intermittent Fasting Bad for You?

The easiest way to follow the 16:8 diet is to choose a 16-hour fasting window that includes the time that a person spends sleeping.

Some experts advise finishing food consumption in the early evening, as metabolism slows down after this time. However, this is not feasible for everyone.

Some people may not be able to consume their evening meal until 7 p.m. or later. Even so, it is best to avoid food for 23 hours before bed.

People may choose one of the following 8-hour eating windows:

  • 9 a.m. to 5 p.m.
  • 10 a.m. to 6 p.m.
  • noon to 8 p.m.

Within this timeframe, people can eat their meals and snacks at convenient times. Eating regularly is important to prevent blood sugar peaks and dips and to avoid excessive hunger.

Some people may need to experiment to find the best eating window and mealtimes for their lifestyle.

Your Brain Needs A Regular Supply Of Dietary Glucose

Some people claim that if you dont eat carbs every few hours, your brain will stop functioning.

This is based on the belief that your brain can only use glucose for fuel.

However, your body can easily produce the glucose it needs via a process called gluconeogenesis .

Even during long-term fasting, starvation, or very very-low-carb diets, your body can produce ketone bodies from dietary fats .

Ketone bodies can feed parts of your brain, reducing its glucose requirement significantly.

However, some people report feeling fatigued or shaky when they dont eat for a while. If this applies to you, you should consider keeping snacks on hand or eating more frequently.

SUMMARY Your body can produce glucose on its own to fuel your brain, meaning that you dont need a constant dietary glucose intake.

You Experience Fatigue Nausea Or Dizziness

If you start to feel tired all the time, nauseous, dizzy, or lightheaded, it could mean you’re not eating enough,;Apovian previously told Insider.

While it’s normal to have some adjustment period when trying a new diet,;experiencing these symptoms for more than a week or two can be a sign that your body isn’t adapting well to intermittent fasting and you should seek medical advice.

And if any of the symptoms are severe, you should stop fasting immediately. Riskier side effects such as fainting or ;changes in blood pressure sometimes occur with more extreme forms of fasting.

Also Check: What Does Intermitten Fasting Do

How Intermittent Fasting Works

The primary goal of intermittent fasting for weight loss is to get the insulin levels to decrease to a level where the body will begin to burn stored fat for energy.

Here is how it works. When the food we eat is metabolized , it ends up as molecules in the blood stream.;One such molecule is glucose .;Normally, when there is more circulating blood glucose than the body can use for energy, the excess is stored as fat for future use.;But, for glucose to be utilized by the cells, it requires insulin.;Between meals the body doesnt require insulin so insulin levels decline. When insulin levels are low, the fat cells release some of the stored glucose, resulting in weight loss.

Avoid Intermittent Fasting If You Are At Risk For An Eating Disorder

Intermittent Fasting: Good Or Bad For You?

Intermittent fasting has a high association with bulimia nervosa, and as a result, individuals who are susceptible to an eating disorder should not undergo any diet associated with fasting. Risk factors for an eating disorder include having a family member with an eating disorder, perfectionism, impulsivity and mood instability.

Recommended Reading: What Should Your Blood Sugar Be Fasting

The : 2 Intermittent Fasting Diet

Thee 5:2 intermittent fasting diet is one type of popular fasting diets, introduced in Dr. Jason Fungs best-selling book “The Obesity Code” in 2016. The 5:2 diet involves five days of eating the recommended daily caloric intake and two non-consecutive days of eating a reduced-calorie diet.;On fasting days, food is not eliminated altogether, rather, the number of calories is reduced.

If you have diabetes and want to try the 5:2 diet, speak to your healthcare provider or diabetic team and get a recommendation for a daily caloric intake guideline for fasting and non-fasting days.

Studies on the 5:2 Diet

Studies have shown that the 5:2 diet may help reduce insulin resistance and promote weight loss in people with type 2 diabetes or prediabetes.

The first long-term study of the 5:2 diet,;published in 2018, by the Journal of the American Medical Association , discovered that intermittent fasting could be effective for those with diabetes who have trouble sticking to a long-term, daily diet regime. The study observed 137 people with type 2 diabetes; half of the study participants followed the 5:2 diet and the other half adhered to a daily calorie-restricted diet .;The group that fasted for two non-consecutive days per weekconsumed 500 to 600 calories on the fasting days and ate normally on the other five days of the week.

Safety of the 5:2 Diet for People With Diabetes

Pros Of Intermittent Fasting For Women

“There is substantial research to support the therapeutic benefits of fasting,” says Jillian Greaves M.P.H., R.D., L.D.N. Integrative Functional Dietitian at Prevention Pantry Nutrition. “Some potential health benefits include improved cellular health, improved metabolic markers, and weight loss.”Studies show that intermittent fasting leads to weight loss in women, but doesn’t lead to any more weight loss than a calorie deficit overall. However, the structure of IF makes it easier for some to reduce caloric intake.

Intermittent fasting can boost fat burn too. When we eat, blood sugar rises and insulin is released to take glucose to our cells for energy. Extra glucose is stored as fast. If you don’t eat for 10-16 hours, your body will start to use its fat stores for energy.

A study in the New England Journal of Medicine found that in a fasted state, cellular repair occurs, which is linked to increased longevity, reduced risk of cancer, lower inflammation and improved metabolism. However, many of the studies are in animals and more studies in women are needed.

There’s also emerging research that eating in sync with circadian rhythm keeps chronic diseases at bay. In other words, eating during a 6-10 hour window during the day, when it’s light outside, and reducing nighttime eating.

Recommended Reading: What Are The Best Foods To Eat When Intermittent Fasting

Intermittent Fasting: What It Is And How I Do It

Here’s a simple definition of intermittent fasting: you eat your normal amount of food in a smaller time frame. It’s not a diet, it’s just a pattern of eating that reduces your eating window each day to about 8 hours.

For example, I usually eat my first meal around 12pm or 1pm and then I can continue eating until my final meal at 8pm. After that, I fast until the next day at 12pm. That breaks out to about 16 hours of fasting and 8 hours of eating each day. I do this almost every day.

I’m not going to dive into the details of intermittent fasting in this article. I have previously written a 3,000 word beginners guide to intermittent fasting and a lengthy question and answer guide on intermittent fasting. If you have questions about how it works and the science behind it, read those articles.

And if you want even more information, I was also interviewed on the Fat Burning Man podcast and the Jimmy Moores live show about intermittent fasting .

Ask The Rd Is Intermittent Fasting Bad Or Good

Is intermittent fasting bad for you?

Video taken from the channel: Goodbye Diabetes

Is Intermittent Fasting Safe For Eating Disorders?Today, I brought on therapist and youtuber Kati Morton to share her opinion on whether or not you should use Intermittent Fasting if you have an eating disorder. We also dive into my thoughts on nutrition considerations with eating disorders..Check out Katis Channel! ELLE NUTRITION FACEBOOK GROUP: This video is for general informational purposes only. It should not be used to self-diagnose and it is not a substitute for a medical exam, cure, treatment, diagnosis, and prescription or recommendation. It does not create a nutritionist-client relationship between Autumn Bates and you. You should not make any change in your health regimen or diet before first consulting a physician and obtaining a medical exam, diagnosis and recommendation. Always seek the advice of a physician, Nutritionist or other qualified health provider with any questions you may have regarding a medical condition. Autumn Elle Nutrition Inc. is not liable or responsible for any advice, course of treatment, diagnosis or any other information, services or product you obtain through this video or site.

Video taken from the channel: Autumn Bates

Video taken from the channel: Total Fitness Bodybuilding

Recommended Reading: Did Intermittent Fasting Work For You

What Does Research Say

The weight loss part, they say, comes from changes in metabolic processes and hormones related to fasting. As well later seein relationship to weight lossthese processes have all been shown to matter at a cellular or hormonal level. Or they have shown promise in rat studies.

Sometimes something works at one level of analysis, and doesnt work for actual humans in real life. Or, sometimes something works for rats or mice, but doesnt work for humans.

Look, I think rat studies are cool! But rats dont care about weight loss.

IF just isnt something weve seen make a big difference with humans, unfortunately. Studies show that it works exactly the same as everything else.

Is Intermittent Fasting Safe

Some people try intermitting fasting for weight management, and others use the method to address chronic conditions such as irritable bowel syndrome, high cholesterol or arthritis. But intermittent fasting isnt for everyone.

Williams stresses that before you try intermittent fasting , you should check in with your primary care practitioner first. Some people should steer clear of trying intermittent fasting:

  • Children and teens under age 18.
  • Women who are pregnant or breastfeeding.
  • People with diabetes or blood sugar problems.
  • Those with a history of eating disorders.

But, Williams says, people not in these categories who can do intermittent fasting safely can continue the regimen indefinitely. It can be a lifestyle change, she says, and one with benefits.

Keep in mind that intermittent fasting may have different effects on different people. Talk to your doctor if you start experiencing unusual anxiety, headaches, nausea or other symptoms after you start intermittent fasting.

Don’t Miss: How To Lose Weight From Intermittent Fasting

What To Do If Fasting Isnt For You

How can you get in shape and lose weight if you find intermittent fasting isnt a good fit?

Learn the essentials of good nutrition.

Fasting or not, you cant go wrong focusing on meal quality: Prioritize lean proteins, colorful veggies and fruits, healthy fats, quality carbohydrates. Crowd out treats, caloric beverages, and processed foods. Cook and eat whole foods. Exercise regularly. Stay consistent.

These basic fundamentals are by far the best things you can do for your health and fitness.

Sure, intermittent fasting may be popular. And maybe your brother or your boyfriend or your husband or even your dad finds it an excellent aid to fitness and health.

But women are different than men, and our bodies have different needs.

Listen to your body. And do what works best for you.

About Author: Ken Harris

Why Intermittent Fasting Can Be Bad For You

Ken Harris is the proudest father and a writing coordinator for the Marketing & Communications division of OSF HealthCare.He has a bachelor’s in journalism from the University of Wisconsin-Madison and worked as a daily newspaper reporter for four years before leaving the field and eventually finding his way to OSF HealthCare.In his free time, Ken likes reading, fly fishing, hanging out with his dog and generally pestering his lovely, patient wife.

Also Check: Why Should I Do Intermittent Fasting

Intermittent Fasting Reduces Protein Synthesis

In the same study linked above, the rates non-collagen protein synthesis was also observed. After 24 hours of fasting, the rate of protein synthesis of the fasted group was 75% of the control groups rate. After 96 hours, it drops down to 54% . Protein synthesis bounces back to normal rates after 72 hours of refeeding.

Dat der protein molecule, next to its RNA buddy.

Interestingly enough, collagen synthesis reduces much more quickly than regular protein synthesis does during intermittent fasting.

What Is Intermittent Fasting

All diets achieve weight loss through the same equation you take in less food energy each day than your body burns for normal activity. Intermittent fasting achieves this goal by severely limiting calories during certain days of the week or during specified hours during the day. The theory is that intermittent fasting will help decrease appetite by slowing the body’s metabolism.

“One pattern that has become a bit popular is the so-called 5:2 diet,” says Dr. Frank Hu, chair of the department of nutrition at the Harvard T.H. Chan School of Public Health. With this system, you eat normally for five days of the week, but restrict food intake to just 500 to 600 calories on the two fasting days. Another variation of intermittent fasting calls for alternating “fast” days, in which you consume a quarter or less of your basic calorie requirement, with “feast” days, during which you eat whatever you choose.

Don’t Miss: Do You Lose Weight Faster With Intermittent Fasting

Youre Eating Too Much During The Eating Window

This is the most common trap people fall into with IF. If youve chosen a particularly restrictive regimen that leaves you hangry AF for hours of the day, youre likely to go a wee bit overboard the moment the clock says Its time to eat.

Recent research suggests that restrictive diets often dont work because we tend to become so emotionally starved that when we do allow ourselves to eat, we go hog wild and overeat in a fit of deprivation. Benton D, et al. . Reducing calorie intake may not help you lose body weight. DOI: 10.1177/1745691617690878

Any diet that has you preoccupied with your next meal is a recipe for a binge. Make sure youre not allowing yourself to feel unnecessarily hungry for long periods of time.

You can achieve this by choosing the right foods to chow down on during your eating hours.

You’re Trying To Gain Or Maintain Muscle

Is water bad for you when intermittent fasting?

While intermittent fasting is often used to boost weight loss, it could backfire for athletes and exercise enthusiasts, particularly those trying to get stronger.;

Research has shown intermittent fasting may make you more likely to lose muscle mass, compared to other types of weight loss diets.;

Skipping meals can also make it hard to stay in a calorie surplus which is necessary for building muscle, particularly if you’re also exercising intensely and often.;

Also Check: Can You Have Coffee While Intermittent Fasting

Why Its Hard For Women To Get A Six

We know low-energy diets can reduce fertility in women. So can being super lean. 3 4 5

When you think about it, it makes good evolutionary sense that the body might want a little emergency padding on the abdomen.

Human females are unique in the mammalian world. Get this: Nearly all other mammals can terminate or pause a pregnancy when conditions arent right.

If it doesnt seem like a good time to raise young, embryonic development is paused until conditions improve .6

Youve known this since middle school health class: Female humans cant pause pregnancies.

In humans, the placenta breaches the maternal blood vessels, and the fetus is in complete control.

The baby can block the action of insulin in order to hoard more glucose for itself. It can even make the mothers blood vessels dilate, adjusting blood pressure to get more nutrients.

That baby is determined to survive no matter what the cost to the mother. This phenomenon, which scientists actually compare to the host-virus relationship, is whats known as maternal-fetal conflict.7 8

Once a woman becomes pregnant, she cant sweet-talk the fetus to stop growing. The result: Fertility at the wrong timelike, during a famine could be fatal.

Hence, a little calorie-storage pooch is reproductively protective in case times get tough.

What Is Intermittent Fasting And Why Would You Do It

Intermittent fasting is not a diet, it’s a pattern of eating. It’s a way of scheduling your meals so that you get the most out of them. Intermittent fasting doesnt change what you eat, it changes when you eat.

Why is it worthwhile to change when youre eating?

Well, most notably, its a great way to get lean without going on a crazy diet or cutting your calories down to nothing. In fact, most of the time you’ll try to keep your calories the same when you start intermittent fasting. Additionally, intermittent fasting is a good way to keep muscle mass on while getting lean.

With all that said, the main reason people try intermittent fasting is to lose fat. We’ll talk about how intermittent fasting leads to fat loss in a moment.

Perhaps most importantly, intermittent fasting is one of the simplest strategies we have for taking bad weight off while keeping good weight on because it requires very little behavior change. This is a very good thing because it means intermittent fasting falls into the category of simple enough that you’ll actually do it, but meaningful enough that it will actually make a difference.

Also Check: How Long Do You Fast With Intermittent Fasting

Youre Ignoring The *what* In Favor Of The *when*

IF is a time-centered diet, and most plans dont give any explicit rules about the types of food to eat during your eating window. But thats not an open invitation to subsist on french fries, milkshakes, and beer alone.

Fasting isnt magic. In addition to some small metabolic advantages, its primary impact on weight loss is largely that you limit your eating hours and thus the amount of calories you consume. Stockman M-C, et al. . Intermittent fasting: Is the wait worth the weight?

Unfortunately, you can quickly undo that effect by choosing the wrong kinds of foods. Shift your perspective from a treating yourself mentality during your eating hours to one that revolves around eating the most nutrient-dense, nourishing foods you can get your hands on.

We recommend trying to make sure every meal or snack has a combination of fiber, protein, and healthy fats to help fill you up and carry you through your fasting phase.

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