[Attummm]

The reason why that happened is quite simple. You are currently accustomed to being in a fed state, and it will take a while to adapt to a fasted state.

Additionally, during the initial period, you may experience issues such as sugar withdrawal, which can lower your performance.

Your body’s cells will need to switch from predominantly using glucose to using ketones and fatty acids. This process can take weeks to months.

The body is able to use both glucose and ketones; this is called being metabolically flexible. This flexibility can be achieved through intermittent fasting.

So give it time.