There are many different intermittent fasting plans. 
For example, reducing the caloric intake to 500-700 calories at two days a week while eating normally at the others is a popular plan.
Another intermittent fasting plan can be to eating only in a specific interval on a daily basis.
Therefore, there is no general answer whether intermittent fasting two times a month creates any side effects or not.
However, research indicate that intermittent fasting can have positive influences on the metabolism.
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