{"id":117828,"date":"2023-11-14T21:50:57","date_gmt":"2023-11-15T01:50:57","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=117828"},"modified":"2025-09-12T15:26:48","modified_gmt":"2025-09-12T19:26:48","slug":"health-benefits-of-intermittent-fasting","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/health-benefits-of-intermittent-fasting\/","title":{"rendered":"The 5 Health Benefits of Intermittent Fasting, Explained"},"content":{"rendered":"\n<p>What are the health <a href=\"https:\/\/www.shortform.com\/blog\/what-are-the-benefits-of-intermittent-fasting\/\">benefits of intermittent fasting<\/a>? Can intermittent fasting solve existing health problems?<\/p>\n\n\n\n<p>The five <a href=\"https:\/\/www.shortform.com\/blog\/health-benefits-of-intermittent-fasting-2\/\">health benefits of intermittent fasting<\/a> are promoting weight loss, improving body function, elevating cognitive function, enhancing workouts, and encouraging better sleep. Understanding these benefits in detail can help your confidence in trying an intermittent fasting program.<\/p>\n\n\n\n<p>Learn what the health benefits of fasting are and how to make the most of an intermittent fasting routine.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p><em>Editor\u2019s note: This article is part of <a href=\"https:\/\/www.shortform.com\/blog\/hub\/personal-life\/health\/nutrition\/dieting-guide\/\" target=\"_blank\" rel=\"noreferrer noopener\">Shortform\u2019s guide to dieting<\/a>. If you like what you read here, there\u2019s plenty more to check out in the guide!<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-health-benefit-1-fasting-promotes-weight-loss\">Health Benefit #1: Fasting Promotes Weight Loss<\/h2>\n\n\n\n<p>The health benefits of intermittent fasting include promoting weight loss. <strong>Fasting helps you lose weight by switching your body\u2019s energy source from glucose to fat. <\/strong>When you fast, your body runs out of glucose from food, so it starts burning fat instead. It converts your fat into energy molecules called <em>ketones<\/em>, which also suppress your hunger. When your body burns fat as its primary energy source, you\u2019re in a state called <em>ketosis<\/em>.<\/p>\n\n\n\n<p>(Shortform note: When you stop consuming glucose, it takes some time before your body starts burning fat as its primary fuel source. In <a href=\"https:\/\/www.shortform.com\/app\/book\/the-obesity-code\" target=\"_blank\" rel=\"noreferrer noopener\"><em>The Obesity Code<\/em><\/a>, Jason Fung says <em>ketosis <\/em>kicks in after <a href=\"https:\/\/www.shortform.com\/app\/book\/the-obesity-code#change-when-you-eat\" target=\"_blank\" rel=\"noreferrer noopener\">two to three days<\/a> of fasting.)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-health-benefit-2-fasting-improves-your-body-function\">Health Benefit #2: Fasting Improves Your Body Function<\/h2>\n\n\n\n<p>Apart from promoting weight loss,<strong> fasting also helps your body function more cleanly and optimally.<\/strong> Here are several ways fasting improves your physical health:<\/p>\n\n\n\n<p><strong>1. Fasting triggers autophagy<\/strong>. This is your body\u2019s natural way of cleansing itself by getting rid of toxins and damaged cell parts. This helps your body function more effectively, slows aging, and reduces inflammation, which is your body\u2019s response to illness or injury. While inflammation helps heal an acute problem (like an ankle sprain), it can be harmful if the response lasts too long. He argues that many modern foods contain harmful toxins that keep your body in a constant state of inflammation. Fasting and autophagy help you clear out those toxins and soothe your inflammation.<\/p>\n\n\n\n<p>(Shortform note: Being able to stimulate autophagy might become increasingly important as we age. In <a href=\"https:\/\/shortform.com\/app\/book\/ageless\/1-page-summary\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Ageless<\/em><\/a>, Andrew Steele explains that as time passes, our bodies accumulate leftover protein fragments that can interfere with autophagy. He notes fasting as one method to trigger autophagy, but he also writes about a potential alternative: drugs called <a href=\"https:\/\/shortform.com\/app\/book\/ageless\/1-page-summary#aging-process-1-harmful-substances-accumulate\" target=\"_blank\" rel=\"noreferrer noopener\">dietary restriction mimetics<\/a>. These drugs mimic the effects of calorie restriction and help boost autophagy without requiring you to make dietary changes. According to other experts, you can also <a href=\"https:\/\/my.clevelandclinic.org\/health\/articles\/24058-autophagy\" target=\"_blank\" rel=\"noreferrer noopener\">trigger autophagy in simpler ways<\/a>\u2014such as by exercising, restricting your calories, or following a ketogenic diet.)<\/p>\n\n\n\n<p><strong>2. Fasting balances your insulin levels.<\/strong> When you eat, your body turns food into glucose that your cells can use for energy and releases a hormone called <em>insulin<\/em> to help your cells absorb the glucose. However, eating too much <a href=\"https:\/\/www.shortform.com\/blog\/why-is-food-processed\/\">processed food<\/a> overloads your body with more glucose than it can use, which can make your cells less responsive to insulin (a condition called <em><a href=\"https:\/\/www.shortform.com\/blog\/peter-attia-insulin-resistance\/\">insulin resistance<\/a><\/em>, which can result in type 2 diabetes). By depriving your body of calories when you fast, you make your body use its stored sugar and fat instead. This stabilizes your glucose levels and lowers your insulin production, which keeps your cells sensitive to insulin.<\/p>\n\n\n\n<p>(Shortform note: In addition to fasting from food, you can also pay attention to what you eat to prevent insulin resistance. Experts recommend you <a href=\"https:\/\/my.clevelandclinic.org\/health\/diseases\/22206-insulin-resistance#symptoms-and-causes\" target=\"_blank\" rel=\"noreferrer noopener\">eat foods with a low to medium glycemic index<\/a>\u2014a rating system that measures how different foods affect your blood sugar levels. Further, in addition to eating a diet of processed foods, other factors can put you at risk for insulin resistance, such as obesity, age, physical inactivity, certain medications, and hormonal or genetic conditions.)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-health-benefit-3-fasting-elevates-your-cognitive-functioning\">Health Benefit #3: Fasting Elevates Your Cognitive Functioning<\/h2>\n\n\n\n<p>Fasting has two important benefits for your brain\u2014it helps it function better and it improves your mental health:<\/p>\n\n\n\n<p><strong>1. Fasting enhances your focus, memory, and learning. <\/strong>When you fast, your senses become sharper. This is because evolutionarily, when in a fasted state, our ancestors needed heightened focus to find food. Fasting also helps you think more clearly by reducing inflammation in the brain, clearing out toxins in your bloodstream, and <a href=\"https:\/\/www.shortform.com\/blog\/how-to-direct-your-energy\/\">directing energy<\/a> your body normally uses for digestion to your brain instead.<\/p>\n\n\n\n<p><strong>2. Fasting lifts your mood. <\/strong>During a fast, your body produces chemicals such as dopamine and adrenaline that enhance your mood and energy. These chemicals allowed our ancestors to survive: They gave them energy when they were hungry and helped them <a href=\"https:\/\/www.shortform.com\/blog\/how-to-keep-yourself-motivated\/\">stay motivated<\/a> to hunt for food.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Harnessing the Benefits of BDNF Through Fasting<\/strong><br><br>In <a href=\"https:\/\/www.shortform.com\/app\/book\/fast-feast-repeat\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Fast. Feast. Repeat.<\/em><\/a>, Gin Stephens explains that fasting boosts your brain power and mood by boosting the levels of a compound called <a href=\"https:\/\/www.shortform.com\/app\/book\/fast-feast-repeat#health-benefits-of-fasting\" target=\"_blank\" rel=\"noreferrer noopener\">brain-derived neurotrophic factor (BDNF)<\/a>, which protects your neurons from wearing down. Fasting raises your BDNF levels, which helps you think better and lowers your risk of diseases like Alzheimer\u2019s and Parkinson\u2019s.&nbsp;<br><br>BDNF also regulates your mood: <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC6476855\/\" target=\"_blank\" rel=\"noreferrer noopener\">Lower levels of the compound are linked to depression<\/a>, and some research suggests that one reason antidepressants work is that they increase BDNF levels.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-health-benefit-4-fasting-enhances-your-workouts\">Health Benefit #4: Fasting Enhances Your Workouts<\/h2>\n\n\n\n<p>Another benefit of fasting is that it <strong>enhances your workouts by making your body more metabolically flexible and resilient.<\/strong> Asprey explains that normally when you work out, your body first turns to carbohydrates\u2014derived from food\u2014for energy. When you fast, however, you don\u2019t have a supply of carbohydrates to use as fuel, so your body burns fat instead. This has two advantages for your workouts: First, fats provide more energy than carbohydrates. Second, fats are anti-inflammatory, so they speed up your muscle healing with less ache and soreness.<\/p>\n\n\n\n<p>(Shortform note: Working out while in <em>ketosis<\/em> can not only help you burn more fat and recover post-workout, but it can also improve your body composition by <a href=\"https:\/\/www.prospectmedical.com\/resources\/wellness-center\/working-out-while-intermittent-fasting\" target=\"_blank\" rel=\"noreferrer noopener\">optimizing your hormones<\/a>: In particular, fasting while sprint-training raises human growth hormone (HGH) production and insulin sensitivity, which gives you a more youthful and lean body. However, experts caution that your performance may dip at first until your body gets used to burning fat and not carbohydrates for fuel. It could take up to six months before you become metabolically flexible and have adapted to using fat as a fuel source.)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-health-benefit-5-fasting-improves-sleep\">Health Benefit #5: Fasting Improves Sleep<\/h2>\n\n\n\n<p>Fasting can improve the quality of your sleep, which can have a number of benefits for your health: Sleep reduces stress and inflammation, accelerates healing, increases your sex drive, helps with weight loss, and improves your memory and thinking.&nbsp;<\/p>\n\n\n\n<p>(Shortform note: In <a href=\"https:\/\/www.shortform.com\/app\/book\/why-we-sleep\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Why We Sleep<\/em><\/a>, Matthew Walker agrees that there\u2019s a long list of benefits quality sleep can bring. Walker notes, further, that <a href=\"https:\/\/www.shortform.com\/app\/book\/why-we-sleep#how-sleep-deprivation-harms-you\" target=\"_blank\" rel=\"noreferrer noopener\">sleep <em>deprivation<\/em> can lead to a host of negative health outcomes<\/a>, including not only the opposites of sleep\u2019s benefits but also decreased emotional control and an increase of many diseases not typically associated with sleep, such as cancer and heart disease.)<\/p>\n\n\n\n<p>Improper eating habits can interfere with your body\u2019s sleep patterns. If you eat close to your bedtime, your stomach will signal to your body that it\u2019s still time to be awake, and you\u2019ll have trouble sleeping soundly. This is not only because your digestive tract is actively consuming energy but also because your blood sugar and insulin levels are increasing, which can cause you to awaken during the night.<\/p>\n\n\n\n<p>Experts recommend that you stop eating at least three hours before going to bed. This gap of time allows for enough digestion that your blood sugar won\u2019t be overly elevated as you settle down for the night.&nbsp;&nbsp;<\/p>\n\n\n\n<p>(Shortform note: Most experts agree with the recommendation to refrain from eating a large meal before bedtime and to allow around three hours to pass after eating before you go to sleep. However, some caution there are <a href=\"https:\/\/www.sleepfoundation.org\/nutrition\/is-it-bad-to-eat-before-bed\" target=\"_blank\" rel=\"noreferrer noopener\">exceptions to this advice<\/a>. If you struggle to maintain a stable blood sugar level, eating a small, nutrient-dense snack before bedtime may help you sleep better as it can prevent your blood sugar from either rising or falling sharply during the night. In addition, some nutritionists contend that an <a href=\"https:\/\/www.sleep.com\/sleep-health\/foods-that-help-you-sleep\" target=\"_blank\" rel=\"noreferrer noopener\">evening snack<\/a> of foods rich in melatonin (such as cherry juice), magnesium (like almonds), or anti-inflammatory antioxidants (like kiwi fruit) can improve your sleep.)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What are the health benefits of intermittent fasting? Can intermittent fasting solve existing health problems? The five health benefits of intermittent fasting are promoting weight loss, improving body function, elevating cognitive function, enhancing workouts, and encouraging better sleep. Understanding these benefits in detail can help your confidence in trying an intermittent fasting program. Learn what the health benefits of fasting are and how to make the most of an intermittent fasting routine.<\/p>\n","protected":false},"author":24,"featured_media":117846,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[17,16,7],"tags":[1330],"class_list":["post-117828","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-food","category-health","category-lifestyle","tag-fast-this-way","","tg-column-two"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v24.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The 5 Health Benefits of Intermittent Fasting, Explained - Shortform Books<\/title>\n<meta name=\"description\" content=\"The health benefits of intermittent fasting include improved sleep, better cognitive functioning, and more. Learn more about these benefits.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.shortform.com\/blog\/health-benefits-of-intermittent-fasting\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The 5 Health Benefits of Intermittent Fasting, Explained\" \/>\n<meta property=\"og:description\" content=\"The health benefits of intermittent fasting include improved sleep, better cognitive functioning, and more. 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