In addition to lowering insulin and increasing growth hormone levels, it increases the release of the fat burning hormone norepinephrine (noradrenaline).īecause of these changes in hormones, short-term fasting may increase your metabolic rate by 3.6–14% ( 14, 15).īy helping you eat fewer and burn more calories, intermittent fasting causes weight loss by changing both sides of the calorie equation. Weight loss is the most common reason for people to try intermittent fasting ( 13).īy making you eat fewer meals, intermittent fasting can lead to an automatic reduction in calorie intake.Īdditionally, intermittent fasting changes hormone levels to facilitate weight loss. Your body’s cells also change the expression of genes and initiate important cellular repair processes. When you fast, human growth hormone levels go up and insulin levels go down. These changes in hormone levels, cell function and gene expression are responsible for the health benefits of intermittent fasting. Gene expression: There are changes in the function of genes related to longevity and protection against disease ( 11, 12).This includes autophagy, where cells digest and remove old and dysfunctional proteins that build up inside cells ( 9, 10) Cellular repair: When fasted, your cells initiate cellular repair processes.Lower insulin levels make stored body fat more accessible ( 8). Insulin: Insulin sensitivity improves and levels of insulin drop dramatically.This has benefits for fat loss and muscle gain, to name a few ( 4, 5, 6, 7). Human Growth Hormone (HGH): The levels of growth hormone skyrocket, increasing as much as 5-fold.Here are some changes that occur in your body when you fast: Your cells also initiate important repair processes and change the expression of genes. When you fast, several things happen in your body on the cellular and molecular level.įor example, your body adjusts hormone levels to make stored body fat more accessible. All of them split the day or week into eating and fasting periods. There are several different ways to do intermittent fasting. Many people find the 16/8 method to be the simplest, most sustainable and easiest to stick to. The 5:2 diet: With this method, you consume only 500–600 calories on two nonconsecutive days of the week, but eat normally the other 5 days.īy reducing your calorie intake, all of these methods should cause weight loss as long as you don’t compensate by eating much more during the eating periods.Eat-Stop-Eat: This involves fasting for 24 hours, once or twice a week, for example by not eating from dinner one day until dinner the next day.The 16/8 method: Also called the Leangains protocol, it involves skipping breakfast and restricting your daily eating period to 8 hours, such as 1–9 p.m.There are several different ways of doing intermittent fasting - all of which involve splitting the day or week into eating and fasting periods.ĭuring the fasting periods, you eat either very little or nothing at all. It’s currently very popular in the health and fitness community. Intermittent fasting (IF) is an eating pattern that cycles between periods of fasting and eating. In fact, fasting from time to time is more natural than always eating 3–4 (or more) meals per day.įasting is also often done for religious or spiritual reasons, including in Islam, Christianity, Judaism and Buddhism. Sometimes they couldn’t find anything to eat.Īs a result, humans evolved to be able to function without food for extended periods of time. Ancient hunter-gatherers didn’t have supermarkets, refrigerators or food available year-round. In this respect, it’s not a diet in the conventional sense but more accurately described as an eating pattern.Ĭommon intermittent fasting methods involve daily 16-hour fasts or fasting for 24 hours, twice per week.įasting has been a practice throughout human evolution. It doesn’t specify which foods you should eat but rather when you should eat them.
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