What is intermittent fasting?
Intermittent fasting involves cycling between periods of eating and fasting.
Most types of this dietary pattern focus on limiting your meals and snacks to a specific time window — typically between 6 and 8 hours of the day.
For example, 16/8 intermittent fasting involves restricting food intake to just 8 hours per day and abstaining from eating during the remaining 16 hours.
Other types involve fasting for 24 hours once or twice per week or significantly cutting calorie intake a few days per week but eating normally during the others.
Although most people practice intermittent fasting to enhance weight loss, it has been associated with many other health benefits as well. In fact, studies show that intermittent fasting may improve blood sugar levels, decrease cholesterol, and boost longevity (1Trusted Source, 2Trusted Source).
Does it work for weight loss?
Several studies show that intermittent fasting may boost weight loss via several mechanisms.
First, restricting your meals and snacks to a strict time window may naturally decrease your calorie intake, which can aid weight loss.
Intermittent fasting may also increase levels of norepinephrine, a hormone and neurotransmitter that can boost your metabolism to increase calorie burning throughout the day (3Trusted SourceTrusted Source).
Furthermore, this eating pattern may reduce levels of insulin, a hormone involved in blood sugar management. Decreased levels can bump up fat burning to promote weight loss (4Trusted Source, 5Trusted Source).
Some research even shows that intermittent fasting can help your body retain muscle mass more effectively than calorie restriction, which may increase its appeal (6Trusted Source).
According to one review, intermittent fasting may reduce body weight by up to 8% and decrease body fat by up to 16% over 3–12 weeks (6Trusted Source).
Synergy with keto
When paired with the ketogenic diet, intermittent fasting can speed up ketosis and amplify weight loss.
The keto diet, which is very high in fats but low in carbs, is designed to kick-start ketosis.
Ketosis is a metabolic state that forces your body to burn fat for fuel instead of carbs. This occurs when your body is deprived of glucose, which is its main source of energy (7Trusted SourceTrusted Source).
Combining intermittent fasting with the keto diet can help your body enter ketosis faster to maximize results. It can likewise mitigate some of the side effects that often occur when starting this diet, including the keto flu, which is characterized by nausea, headaches, and fatigue (8Trusted Source, 9Trusted Source).
Intermittent fasting has also been linked to several other health benefits. It may:
SUMMARY
Intermittent fasting is associated with numerous health benefits, including decreased inflammation, increased heart and brain health, and better blood sugar control.
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