Intermittent fasting involves skipping meals or reducing how much food you eat at certain times of the day or on particular days of the week.
Popular fasting diets include the 5:2 diet, where you limit calories for 2 days every week, and alternate day fasting, where you restrict how much you eat every other day.
But is it good or bad for you? For now, the answer is unclear.
When you fast, your body uses up sugar (glucose) stored in your muscles and liver. Once these stores run out, your body switches to burning fat.
And some studies suggest that intermittent fasting can:
For example, studies show intermittent fasting may help with obesity and type 2 diabetes.
But we don't know much about the impact fasting may have if you do it for a long time. It can also cause side effects, such as hunger, fatigue and nausea.
There's also little evidence to show that fasting offers better results than other forms of dieting.
It's worth noting that fasting isn’t suitable for everyone, so speak to a doctor before you try it.
If you do fast, it’s important to eat a healthy and balanced diet and to avoid overeating when you’re not fasting.
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