What are the pros and cons of intermittent fasting?

Intermittent fasting involves restricting calories a few days a week or limiting eating to a shortened "eating window" each day.  In addition to weight loss, the body can experience numerous benefits from being in a fasted state. In a fully fasted state, your metabolism switches its primary source of fuel from glucose to ketones, which triggers a host of positive cellular responses. Repeated exposure to a fasted state induces cellular adaptations that, at least in the short term, improve markers of metabolic and cardiovascular health. On the downside, the risks are feeling unwell, rebound overeating, losing too much weight, and potentially dangerous if you are taking certain medications.
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