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الخميس, 25 نيسان/أبريل 2019 09:53

8 Health Benefits of Fasting, Backed by Science

كتبه  By healthline.com
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8 Health Benefits of Fasting, Backed by Science

Despite its recent surge in popularity, fasting is a practice that dates back centuries and plays a central role in many cultures and religions.

Defined as the abstinence from all or some foods or drinks for a set period of time, there are many different ways of fasting.

In general, most types of fasts are performed over 24–72 hours.

Intermittent fasting, on the other hand, involves cycling between periods of eating and fasting, ranging from a few hours to a few days at a time.

Fasting has been shown to have many health benefits, from increased weight loss to better brain function.

Here are 8 health benefits of fasting — backed by science.

1. Promotes Blood Sugar Control by Reducing Insulin Resistance

Several studies have found that fasting may improve blood sugar control, which could be especially useful for those at risk of diabetes.

In fact, one study in 10 people with type 2 diabetes showed that short-term intermittent fasting significantly decreased blood sugar levels (1).

Meanwhile, another review found that both intermittent fasting and alternate-day fasting were as effective as limiting calorie intake at reducing insulin resistance (2).

Decreasing insulin resistance can increase your body’s sensitivity to insulin, allowing it to transport glucose from your bloodstream to your cells more efficiently.

Coupled with the potential blood sugar-lowering effects of fasting, this could help keep your blood sugar steady, preventing spikes and crashes in your blood sugar levels.

Keep in mind though that some studies have found that fasting may impact blood sugar levels differently for men and women.

For instance, one small, three-week study showed that practicing alternate-day fasting impaired blood sugar control in women but had no effect in men (3).

2. Promotes Better Health by Fighting Inflammation

While acute inflammation is a normal immune process used to help fight off infections, chronic inflammation can have serious consequences for your health.

Research shows that inflammation may be involved in the development of chronic conditions, such as heart disease, cancer and rheumatoid arthritis (4).

Some studies have found that fasting can help decrease levels of inflammation and help promote better health.

One study in 50 healthy adults showed that intermittent fasting for one month significantly decreased levels of inflammatory markers (5).

Another small study discovered the same effect when people fasted for 12 hours a day for one month (6).

What’s more, one animal study found that following a very low-calorie diet to mimic the effects of fasting reduced levels of inflammation and was beneficial in the treatment of multiple sclerosis, a chronic inflammatory condition (7).

3. May Enhance Heart Health by Improving Blood Pressure, Triglycerides and Cholesterol Levels

Heart disease is considered the leading cause of death around the world, accounting for an estimated 31.5% of deaths globally (8).

Switching up your diet and lifestyle is one of the most effective ways to reduce your risk of heart disease.

Some research has found that incorporating fasting into your routine may be especially beneficial when it comes to heart health.

One small study revealed that eight weeks of alternate-day fasting reduced levels of “bad” LDL cholesterol and blood triglycerides by 25% and 32% respectively (9).

Another study in 110 obese adults showed that fasting for three weeks under medical supervision significantly decreased blood pressure, as well as levels of blood triglycerides, total cholesterol and “bad” LDL cholesterol (10).

In addition, one study in 4,629 people associated fasting with a lower risk of coronary artery disease, as well as a significantly lower risk of diabetes, which is a major risk factor for heart disease (11).

4. May Boost Brain Function and Prevent Neurodegenerative Disorders

Though research is mostly limited to animal research, several studies have found that fasting could have a powerful effect on brain health.

One study in mice showed that practicing intermittent fasting for 11 months improved both brain function and brain structure (12).

Other animal studies have reported that fasting could protect brain health and increase the generation of nerve cells to help enhance cognitive function (1314).

Because fasting may also help relieve inflammation, it could also aid in preventing neurodegenerative disorders.

In particular, studies in animals suggest that fasting may protect against and improve outcomes for conditions such as Alzheimer’s disease and Parkinson’s (1516).

However, more studies are needed to evaluate the effects of fasting on brain function in humans.

5. Aids Weight Loss by Limiting Calorie Intake and Boosting Metabolism

Many dieters pick up fasting looking for a quick and easy way to drop a few pounds.

Theoretically, abstaining from all or certain foods and beverages should decrease your overall calorie intake, which could lead to increased weight loss over time.

Some research has also found that short-term fasting may boost metabolism by increasing levels of the neurotransmitter norepinephrine, which could enhance weight loss (17).

In fact, one review showed that whole-day fasting could reduce body weight by up to 9% and significantly decrease body fat over 12–24 weeks (18).

Another review found that intermittent fasting over 3–12 weeks was as effective in inducing weight loss as continuous calorie restriction and decreased body weight and fat mass by up to 8% and 16% respectively (19).

In addition, fasting was found to be more effective than calorie restriction at increasing fat loss while simultaneously preserving muscle tissue (19).

6. Increases Growth Hormone Secretion, Which Is Vital for Growth, Metabolism, Weight Loss and Muscle Strength

Human growth hormone (HGH) is a type of protein hormone that is central to many aspects of your health.

In fact, research shows that this key hormone is involved in growth, metabolism, weight loss and muscle strength (20212223).

Several studies have found that fasting could naturally increase HGH levels.

One study in 11 healthy adults showed that fasting for 24 hours significantly increased levels of HGH (24).

Another small study in nine men found that fasting for just two days led to a 5-fold increase in the HGH production rate (25).

Plus, fasting may help maintain steady blood sugar and insulin levels throughout the day, which may further optimize levels of HGH, as some research has found that sustaining increased levels of insulin may reduce HGH levels (26).

7. Could Delay Aging and Extend Longevity

Several animal studies have found promising results on the potential lifespan-extending effects of fasting.

In one study, rats that fasted every other day experienced a delayed rate of aging and lived 83% longer than rats that didn’t fast (27).

Other animal studies have had similar findings, reporting that fasting could be effective in increasing longevity and survival rates (282930).

However, current research is still limited to animal studies. Further studies are needed to understand how fasting may impact longevity and aging in humans.

8. May Aid in Cancer Prevention and Increase the Effectiveness of Chemotherapy

Animal and test-tube studies indicate that fasting may benefit the treatment and prevention of cancer.

In fact, one rat study found that alternate-day fasting helped block tumor formation (31).

Similarly, a test-tube study showed that exposing cancer cells to several cycles of fasting was as effective as chemotherapy in delaying tumor growth and increased the effectiveness of chemotherapy drugs on cancer formation (32).

Unfortunately, most research is limited to the effects of fasting on cancer formation in animals and cells.

Despite these promising findings, additional studies are needed to look at how fasting may influence cancer development and treatment in humans.

Link : https://www.healthline.com/nutrition/fasting-benefits#section10

قراءة 408 مرات آخر تعديل على الخميس, 02 أيار 2019 07:37

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