You have to eat to get out of starvation mode.

When you are in starvation mode your stomach will appear flatter and your ribs will show. You will also become weak and have headaches.

It would take a few days of not eating for your body to go into starvation mode. When the body goes into starvation mode, it begins to use fat reserves, muscle and tissue for fuel.

Eat

Starvation mode is not a medical term.

Starvation is not having sufficient to eat or a proper balanced diet to maintain life and good health.