Dante Carrillo
Alternate-day fasting (ADF) is an intermittent fasting approach that involves eating normally one day and fasting the next, either by eating nothing at all or by consuming a significantly reduced number of calories, typically limited to 500. Studies have shown that ADF can lead to moderate weight loss, with participants losing 4% to 8% of their body weight in 6 to 12 weeks, and can also result in reduced belly fat, lower cholesterol levels, and improved metabolic health. However, it is considered an extreme intervention and may not be suitable for everyone due to the potential for extreme hunger during fasting periods.
| Characteristics | Values |
|---|---|
| Definition | Alternate-day fasting (ADF) is an intermittent fasting approach. |
| Description | ADF involves eating normally one day and fasting the next. |
| Calorie Intake | On fasting days, 500 calories are consumed. On non-fasting days, there is no calorie restriction. |
| Weight Loss | ADF causes moderate weight loss in a short amount of time. |
| Health Benefits | ADF may help lower risk factors related to heart disease and type 2 diabetes. It also decreases total cholesterol, low-density lipoprotein cholesterol, and triglycerides. |
| Hunger | ADF may reduce hunger hormones and increase satiety hormones. |
| Ease of Adherence | ADF may be easier to stick to than other diets. |
| Extreme Diet | ADF is considered an extreme intervention and may not be suitable for everyone. |
| Individual Variation | The effects of ADF on hunger vary by individual. |
| Combination with Exercise | Combining ADF with endurance exercise may lead to increased weight loss. |
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What You'll Learn
Alternate-day fasting can lead to weight loss
Alternate-day fasting (ADF) is an intermittent fasting approach that involves eating normally one day and fasting the next. It is purported to be a powerful weight-loss method that provides various health benefits and is easy to stick to.
On fasting days, you can either consume 25% of your daily calorie needs (around 500 calories) or abstain from food entirely. On non-fasting days, you can eat whatever you want, although some sources suggest eating 125% of your caloric needs to compensate for the previous day's fast. The most popular version of this diet is called "The Every Other Day Diet" by Dr. Krista Varady, who has conducted most of the studies on ADF.
Proponents of ADF claim that this approach will lead to weight loss, and studies have shown moderate weight loss in a relatively short amount of time, resulting in 3% to 8% reductions in body weight in 6 to 12 weeks. One study found that both diet groups (alternate-day fasting and daily calorie restriction) lost about 5.5% of their body weight (12 pounds) by month six, and both regained about 1.8% (four pounds) by month 12. However, the alternate fasting day group had a significant elevation in low-density lipoprotein (LDL), which is a risk factor for heart attacks and strokes.
Additionally, ADF may be more effective in reducing fasting insulin levels compared to daily calorie restriction, which can lead to a reduced risk of type 2 diabetes. Furthermore, when research subjects undergoing ADF engaged in endurance exercise, they lost more weight—up to twice as much—than ADF or exercise alone.
However, it is important to note that ADF may not be for everyone. Some people may find it difficult to stick to, and there is a risk of increased hunger and irritability on fasting days. Additionally, ADF may not be suitable for certain groups of people, and it is always a good idea to seek medical supervision before starting any new dietary regimen.
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It may reduce hunger hormones
Alternate-day fasting (ADF) is an intermittent fasting approach where you fast every other day but eat whatever you want on non-fasting days. The most common version of this diet involves modified fasting, where you can eat around 500 calories on fasting days.
ADF may be easier to stick to than other diets because it doesn't increase compensatory hunger. Compensatory hunger refers to increased levels of hunger in response to calorie restriction, which cause people to eat more than they need to when they finally eat. Studies have shown that ADF doesn't seem to increase compensatory hunger. In fact, many people who try modified ADF claim that their hunger diminishes after the first 2 weeks or so, and some find that the fasting days become nearly effortless.
Animal studies have shown that ADF results in decreased amounts of hunger hormones and increased amounts of satiety hormones compared to other diets. For example, ghrelin, often referred to as the "hunger hormone," is produced in the stomach and stimulates appetite. On the other hand, leptin, known as the "satiety hormone," is produced by fat cells and signals to the brain that you are full. Studies have shown that ADF can lead to a decrease in ghrelin levels and an increase in leptin sensitivity, which means your body can better respond to the signals of satiety.
However, the effects of ADF on hunger are inconsistent, and it's important to note that the impact of fasting on hunger hormones may vary from person to person. Some individuals may experience a more significant decrease in ghrelin levels and an increase in leptin sensitivity, while others may not see much change. Additionally, some people who try ADF report feeling uncomfortably hungry and irritable on fasting days, and they don't get accustomed to these discomforts.
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It can be combined with endurance exercise for more weight loss
Alternate-day fasting (ADF) is an intermittent fasting approach. On this diet, you fast every other day but eat whatever you want on the non-fasting days. The most common version of this diet involves "modified" fasting, where you can eat around 500 calories on fasting days.
ADF may be helpful for promoting weight loss, and studies have shown that it can result in moderate weight loss in a short period of time. It can also lead to a reduction in total cholesterol, low-density lipoprotein cholesterol (LDL-C), triglycerides, and systolic and diastolic blood pressure.
However, it's important to note that research has shown that ADF is likely no more effective for promoting weight loss than traditional daily calorie restriction. The effects of ADF on hunger are also inconsistent, with some studies showing that hunger ultimately goes down on fasting days, while others state that hunger remains unchanged.
Nevertheless, ADF can be an effective tool for weight loss, especially when combined with endurance exercise. Research has shown that when subjects undergoing ADF engaged in endurance exercise, they lost more weight—up to twice as much—than with ADF or exercise alone. This combination also resulted in favourable changes in body composition and plasma lipid levels, indicating a potential reduction in the risk of heart disease.
Therefore, if you are considering ADF as a weight-loss strategy, combining it with endurance exercise may enhance your results and provide additional health benefits. However, as with any dietary change, it is recommended to seek medical supervision before starting an ADF regimen.
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It may lower cholesterol and improve metabolic health
Alternate-day fasting (ADF) is an intermittent fasting approach. It involves eating whatever you want on non-fasting days and fasting on alternate days. The most common version of this diet involves "modified" fasting, where you can eat around 500 calories on fasting days.
ADF may be helpful for promoting weight loss, but studies have shown that it is likely no more effective than traditional daily calorie restriction. However, it may be easier to stick to than other diets, and it can be combined with a low-carbohydrate diet for more effective weight loss.
ADF may also have benefits for metabolic health. Studies have shown that it can decrease total cholesterol, low-density lipoprotein cholesterol (LDL-C), and triglycerides. This can lead to a reduced risk of coronary heart disease. ADF has also been shown to positively impact blood pressure, blood sugar, insulin, and inflammatory proteins.
Additionally, ADF can increase levels of brain-derived neurotrophic factor (BDNF), which plays a role in energy balance and body weight maintenance. This may promote improved weight loss maintenance. Research has also shown that ADF does not increase compensatory hunger, which is a common issue with traditional daily calorie restriction.
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It may be easier to stick to than other diets
The alternate-day fasting diet may be easier to stick to than other diets for several reasons. Firstly, it offers a structured and straightforward approach, alternating between fasting and non-fasting days, which can be easier to follow than diets that require constant calorie restriction or complex meal plans. This simplicity makes it easier for individuals to understand and adhere to the diet without feeling overwhelmed.
Another advantage is the
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Frequently asked questions
Alternate-day fasting (ADF) is an intermittent fasting approach. It involves eating normally one day and eating little to nothing the next. The most common version of this diet involves “modified” fasting, where you can eat around 500 calories on fasting days.
Alternate-day fasting may help promote weight loss and may help lower risk factors related to heart disease and type 2 diabetes. It may also help decrease belly fat, body weight, cholesterol levels, and the risk of cardiovascular disease.
Some people may find it hard to stick to due to extreme hunger during fasting periods. A yearlong study found that adherence to alternate-day fasting was not superior to everyday calorie restriction.
