Saturday, May 18, 2024
HomeMust ReadWhat Makes Intermittent Fasting Work

What Makes Intermittent Fasting Work

- Advertisment -

What Kind Of Intermittent Fasting Should I Be Doing

How Does Intermittent Fasting Work for Weight Loss

There are so many different types of intermittent fasting, with fasts of different lengths each having their own benefits to offer. By fasting for only 18 hours, youll start to reduce your insulin levels. By 24 hours in, autophagy will begin. If you continue fasting for 48 hours, your body will start to secrete more growth hormone, and within 72 hours, stem cell production may start to be triggered. This isnt to say that longer fasts are inherently better, but each fasting protocol does have its own effects and benefits.

What The Science Says About Fasting

Research shows that after fasting for 60hrs, resting metabolic rate is reduced by only 8%.

Think about that, if after eating nothing for 60hrs your RMR is only decreased by 8% then missing a meal or fasting for a day will not put you anywhere near starvation mode or mess up your metabolism.

In fact, research shows that short-term fasting can even increase metabolic rate by 3.6% 10%.

As for breakfast research that supports the idea you NEED to have breakfast has been shown to lack probative value and involve biased research reporting. One study showed that the belief we need breakfast outweighs any scientific evidence pointing to the same conclusion.

Additionally, a review paper shows that existing evidence in favour of eating breakfast is weak and that studies show no cause and effect link between skipping breakfast and energy balance.

Ultimately it comes down to the fact that some people get hungry in the morning and function better with breakfast whereas others can forego breakfast to eat later in the day and function just as well.

The truth is for normal people, in normal circumstances fasting can be beneficial and at worst its just going to be a different style of eating with no negative effects. Lets look at how you could structure your day when using the 16:8 intermittent fasting protocol.

Related: Is Skipping Breakfast Bad For You?

How Do Intermittent Fasting Diets Work For Weight Loss

A diet that gives the best results for the least amount of effort has become the holy grail, and according to Dr Zac Turner it actually exists.

Welcome to Ask Doctor Zac, a weekly column from

This week Dr Zac Turner looks at whether intermittent fasting works for weight loss.

Question: Hi Dr Zac, I know Im getting old when each day there is a new thing young people do that makes me confused, and sometimes cross. One of my young co-workers has just started a fasting diet and it doesnt make any sense to me how can not eating for two days make up for normal eating the other five?

I hate to be that person but, back in my day, our diets didnt involve starving ourselves, we simply ate meals with less calories.

Is a fasting diet actually beneficial to losing weight or is it another sham in the long list of popular diets? Cheryl, Perth

Answer: Hi Cheryl, Thanks for your question. To put it simply, yes. Intermittent fasting, when done correctly, can be extremely beneficial to losing weight because it trains the body to not store fat.

The human body is a lazy machine, it is always trying its best to use the least amount of energy as possible. Intermittent fasting is all about changing our physiology from storing to utilising calories consumed, or in other words, increasing your metabolic rate.

RELATED: Doctor reveals one food to avoid spots

RELATED: Doctor on perfect hours of sleep

There are three popular methods for intermittent fasting:

Recommended Reading: How Much Intermittent Fasting For Weight Loss

/8you Skip Meals When You Should Be Eating

Intermittent fasting is all about fasting when you’re supposed to and eating during the allotted eating window. But if you continue to fast and skip meals even when you’re supposed to eat, then you’re sabotaging your own goals and plans. This will only make you weak and in time, will deprive you of the energy to continue.

Can I Exercise During Fasting

Does Intermittent Fasting Work? A Science

Yes. You can continue all your usual activities, including exercise, while fasting.37 You do not need to eat before exercising to provide energy.38 Instead, your body can burn stored energy for fuel.

However, for long-duration aerobic exercise, eating before exercise may increase performance.39 Its also important to drink fluids and replenish sodium around exercise when fasting. This is good to know if youre competing. Learn more

Recommended Reading: What Are Benefits Of Intermittent Fasting

Intermittent Fasting: What Are The Benefits

Fasting for 14 hours or more can also improve the quality of sleep, increase satiety, and improve energy levels. All of these factors can aid in weight loss. An old study suggests that eating only during a 10-hour window can reduce your total calorie intake by nearly 20 percent.

A systematic review of 40 studies published in Molecular and Cellular Endocrinology found intermittent fasting was effective for weight loss, with a typical loss of seven to eleven pounds over ten weeks. If you weigh roughly 200 pounds, that equals a five percent loss of your total body weight in just ten weeks.

How long does intermittent fasting take to work? Its a very common question asked by weight loss enthusiasts. In my opinion, intermittent fasting is hands down the best method of weight loss. Its efficacy when it comes to specifically targeting body fat and burning it for energy is unparalleled.

There are many different types of intermittent fasting such as the 5:2 diet, 16:8 plan, a 24-hour fast, or alternate-day fasting, etc. These plans vary in the number of fast days and the calorie allowances. Read The 12:12 intermittent fasting diet: Can it really boost weight loss and flatten your tummy?

You May Like: Is Keto Or Intermittent Fasting Better

If You Enjoyed This You May Also Like:


The information, including but not limited to, text, graphics, images and other content contained on this website are for informational purposes only. No material on this site is intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of your doctor with any questions you may have regarding a medical condition or treatment and before undertaking a new health care routine or product, and never disregard professional medical advice or delay in seeking it because of something you have read on this website.


Read Also: How To Curb Hunger When Fasting

/8you Have Chosen The Wrong If Plan

Choosing the right IF plan is extremely crucial. If you choose a method that does not sync well with your sleep time or your everyday routine, you may end up doing more harm than good. As mentioned before, beginners should start slow and do not straightaway jump to a 24 hours of fasting. If you cannot keep up with it, you may end up eating more calories than usual, leading to unhealthy weight gain.

/8intermittent Fasting Mistakes To Avoid

Does Intermittent Fasting Work

Whenever you think about losing weight or shedding a certain amount of kilos, you first list down the kind of diets you can follow and the exercises you can perform. Out of all the diet programmes, intermittent fasting is one of the most popular, which is more like a lifestyle rather than a diet.

Several researches have shown that intermittent fasting not only aids your weight loss goals, but also reduces your risk of different health conditions, which is absolutely fantastic! However, following an IF diet is not as simple as it seems. There are many ways it can backfire, which is why you must pay attention to the many mistakes you can make while following such a diet.

You May Like: Which Intermittent Fasting Schedule Is Best

Fats To Eat When Intermittent Fasting

Although its unjustly bad image persists, fat is the most critical macronutrient when doing intermittent fasting.

Pure natural fat, such as extra virgin olive oil, causes almost no insulin reaction. For this reason, fat not only supports weight loss but also other health benefits of fasting.

Also, animal and saturated fats reputation is far worse than the scientifically proven reality. According to recent studies, saturated fatty acids protect against heart attacks and strokes .

Due to the overwhelming burden of proof, even the most stubborn health authorities have now had to admit that saturated fatty acids are not causing cardiovascular disease .

Moreover, saturated fatty acids are more heat resistant than unsaturated ones. Therefore, they are best for frying. However, monounsaturated and polyunsaturated fats belong in any diet as well.

These natural fats supply your body with an ingenious balance of energy during intermittent fasting:

  • Saturated fats

What Happens Inside The Body

In seeking to understand exactly how weight loss and muscle gain work, it is essential to discuss the chemicals/hormones in the body that are responsible for these processes. It is the releasing of these different types of hormones that determine whether we are in burn mode or build mode, which is all determined by how much sugar we have in our blood at a certain time of the day.

Dont worry about trying to reason out exactly how these hormones interact, as scientists are still unraveling the complex way that they affect/trigger each other. The point is to understand that there is a very concrete reason that intermittent fasting works so well.

Also Check: How Does Water Fasting Work

Schedule #: 1: : 4 Omad And Other Types Of Time Restricted Feeding

Popularized and researched by Satchidananda Panda, PhD, time-restricted feeding combines a fasting window with a feeding window. During the fasting window, people either dont eat at all or eat much less than usual. During the feeding window, people may either eat normally or more than normal.

In theory, this protocol takes advantage of our natural circadian rhythm to optimize metabolic health.

What it involves

Three of the more popular types of time-restricted eating include:

  • 16:8, which calls for a 16-hour fast followed by an 8-hour eating window.
  • 20:4, which entails fasting for the first 20 hours of each day, and then eating only during a 4-hour overfeeding window. Generally, most people put their 4-hour overfeeding window at the end of the day, as its more convenient for family dinners and after-work training sessions.
  • OMAD, or one meal a day, which involves consuming all of your calories within 1 hour and nothing for the other 23 hours.

In each approach, some people focus on including highly-satiating foods such as colorful veggies and lean protein. These foods can help to dampen hunger during the fasting window.

For someone following 16:8, it might look like this:

Monday, 8pm: Finish your last meal of the day.

Tuesday, 11am: Work out.

Tuesday, 12pm: Eat your first meal, ideally the biggest one of the day.

Tuesday, 12-8pm: Feeding window during which you eat your daily energy intake.

Tuesday, 8pm: Last meal of the day ends, and the fasting period starts.

How Long Does It Take To Start Losing Weight When You’re Doing Intermittent Fasting

Intermittent Fasting: How Interval Fasting Works

There are a lot of factors that can contribute to how long it may take for the weight to start coming off. “Rate of weight loss will vary greatly from person to person depending on several factors, including: starting weight, the intermittent fasting approach used, the types of food consumed during the eating windows, and more,” says Martin.

If you end up reducing your overall caloric intake right away and you consistently eat fewer calories than you expend, then you should start losing weight immediately. “However, you likely wont notice any weight loss results for at least a couple of weeks,” notes Martin, adding that some weight loss in the beginning will “likely be water weight.”

Depending on the calorie amount you consume while intermittent fasting, you could experience an approximate one- to two- pound weight loss per week, which would mean it could take upwards of eight to 10 weeks to notice significant weight loss, says Kristen Smith, MS, RD, spokesperson for Academy of Nutrition and Dietetics.

If youre losing more than that? It could be a red flag. If you notice yourself losing a noticeable amount of weight during the first few weeks of following an intermittent fasting plan, you should likely re-evaluate your calorie intake to ensure you are consuming adequate nutrition to meet your bodys needs, says Smith.

Recommended Reading: How To Lose Weight Quickly Fasting

It May Increase Human Growth Hormone

Intermittent fasting can encourage fat burn and protect lean muscle in an alternative wayby raising your levels of human growth hormone .

Levels start to decline in our twenties or thirties, leading to dry skin, thinning hair, increased belly fat and wrinkles, says Kellyann Petrucci, M.S., a naturopathic doctor and author of Dr. Kellyanns Bone Broth Diet. Research shows that HGH may help decrease body fat and improve lean muscle mass.

She points to 2011 research from the Intermountain Medical Center Heart Institute, which found that HGH increased an average of 1,300% in women and nearly 2,000% in men during a 24-hour fastRoutine periodic fasting is good for your health, and your heart, study suggests. Intermountain Medical Center. Accessed 6/21/2021. . When fasting causes hunger or stress, the body responds by releasing more cholesterolthe researchers notedencouraging it to burn fat instead of glucose as fuel and decreasing the number of fat cells in the body.

Types Of Intermittent Fasting

The most common form of IF is the 16/8 fasting method, where you eat all of your calories during a predetermined 8-hour window and eat nothing for the remaining 16 hours of the day. Alternate day fasting is another type of fasting method, where you eat at normal times one day and then either eat no calories the next day, or no more than 25 percent of your typical calorie intake for a day .

An actual 100 percent fast every other day is uncommon, and could cause some loss in muscle mass over time. The 16/8 fast seems to fit our normal work schedules pretty nicely, and has all of the benefits of fasting without getting to the point of muscle loss. People who have done IF before may see benefits from longer fasts as their bodies adjust to the routine. In the end, pick a window that works with your schedule and lifestyle.

Read Also: How To Succeed With Intermittent Fasting

Best Intermittent Fasting Foods To Eat

The great thing about intermittent fasting is there are no specifications or restrictions about what type or how much food to eat. That said, fast food and junk food will not help. A well-balanced diet is key to succeeding when you adopt an intermittent fasting dietary regime and this will ensure that you stick to it long term. Like anything there are no quick easy fixes when it comes to health.

For women over 50 intermittent fasting is both a great way to reduce calories, increase healthy foods, allow the body to rest for long periods of time and rejuvenate itself as well as burn fat and lose weight. If losing weight is your goal, especially belly fat, you should focus on nutrient-dense foods like green veggies, whole grains, legumes, beans, nuts and seeds, as well as high proteins. Adding high fibre, unprocessed foods will increase feelings of satiety faster and for longer.

We detail below some of the very best foods to choose to add to your diet to help your fasting efforts. This list of foods is also super helpful for naturally boosting collagen in the body which is also essential for women over 50 to ensure the structure and integrity of their skin remains. Read our full article about foods to naturally boost collagen right here!

Helps Improve Heart Health

How Long Does Intermittent Fasting Take To Work? [2021]

With heart disease being the number one cause of death worldwide, it is important to find ways to reduce the numbers and ultimately lower the risk of heart conditions.

Intermittent fasting has been studied for various heart health benefits. Fasting has been shown to lower blood sugar levels and reduce inflammation, as mentioned previously. Yet, there are many other factors fasting can improve.

Studies display that intermittent fasting methods can lower blood pressure, triglycerides, cholesterol and LDL. All of which are key drivers of heart conditions such as strokes, heart attacks, cardiovascular disease and cholesterol. Reducing these factors can lower the risk of heart disease and improve heart health.

Don’t Miss: Is Fasting Or Keto Better

Why Intermittent Fasting Can Lead To Weight Loss

The most common intermittent fasting plan is the 16:8 diet, which requires people to fast for 16 hours then eat only within a specified 8-hour window.

Intermittent fasting has become increasingly popular in recent years, but the research has been mixed on whether intermittent fasting can cause meaningful weight loss.

Dr. Artur Viana, the clinical director of Yale Medicines Metabolic Health and Weight Loss Program and an associate professor of digestive diseases at Yale University, said weight loss likely happens since people practicing time-restricted eating tend to consume fewer calories overall.

It is unlikely that someone will overcome the calories skipped during the 16 hours of fasting in those 8 hours theyre allowed to eat, Viana said.

Dr. John Morton, a bariatric surgeon at Yale Medicine and vice chair of surgical quality for Yale School of Medicine, said intermittent fasting also reduces nighttime eating.

One thing that we are sure of is that when you eat late at night, it does increase your risk of gaining weight, Morton said.

Because the metabolism slows down at night, its harder to burn calories, Morton said.

Some research suggests intermittent fasting can also enhance metabolism.

Dr. Mitchell Roslin, the chief of obesity surgery at Lenox Hill Hospital in New York City, said evidence shows fasting causes insulin levels to drop.

- Advertisment -

Most Popular

- Advertisment -