Just as a heads up, it only takes 24-36 hours to get into ketosis. :-) That said, congrats on successfully fasting! Were you getting electrolytes in during that time as well?
Lexde - It actually takes 2 - 10 days to enter ketosis depending on the person and how many carbs they are eating, preferably under 20 carbs a day.
Wingfold2001 - Congrats on completing the fast by the way !
The body can only store a two-day supply of glucose in the form of glycogen, so after two days of consuming no more than 20 grams of carbohydrates, most people go into lipolysis/ketosis.
On just water, it’s going to be between 24-36 hours.
Stage 1 — The glycogen depletion phase — 6 to 24 hours
During this phase, most energy is provided by glycogen. At this point, hormone levels are shifting, causing increases in gluconeogenesis and fat burning, but ketone production is not active yet.
Stage 2 — The gluconeogenic phase — 2 to 10 days
During this phase, glycogen is fully depleted, and gluconeogenesis takes over to provide the body with energy. Ketones are starting to be produced, but at lower levels. The window of time for this phase is so broad (two to ten days) because it depends on who is fasting. For example, healthy males and obese individuals tend to stay in the gluconeogenic phase for more extended periods of time than healthy women.
Stage 3 — The ketogenic phase — after 2 to 10 days
This phase is characterized by a decrease in protein breakdown for energy and an increase in fat and ketone use. At this point, you will definitely be in ketosis. Each person will enter this stage at different rates depending on genetic and lifestyle factors, activity levels, and if they have fasted/restricted carbs before.