Fasting timer
Start a fast, watch the ring fill and see what is generally happening hour by hour.
I started earlier…
What’s happening
General timelines based on common physiology. Everyone is different, and these are not predictions for you.
You are digesting your last meal. Blood sugar and insulin are higher.
Digestion finishes and insulin levels begin to fall.
Your body draws on stored glycogen for energy.
Many people begin relying more on fat; ketone levels start to rise.
Ketone production typically increases further. Stay hydrated.
Fasts longer than a day should be discussed with your doctor.
Your fasting history
Meals worth breaking a fast for
Rich, satisfying low-carb dinners with the macros on every recipe.
Free: The Keto Dress Code
Fasting questions
What is intermittent fasting?
Intermittent fasting means cycling between periods of eating and not eating. Common patterns include 16:8 (fast 16 hours, eat within 8) and 18:6. It is not a diet in itself, just a schedule for when you eat.
Is intermittent fasting the same as keto?
No. They are separate approaches, though many people combine them because eating low-carb can make longer gaps between meals feel easier.
Can I drink anything while fasting?
Water, plain sparkling water, black coffee and unsweetened tea are generally considered fine. Anything with calories, such as cream or sweetener-sweetened drinks with calories, may break a strict fast.
Who should not fast?
Fasting is not appropriate for everyone, including people who are pregnant or nursing, under 18, have a history of eating disorders, have type 1 diabetes or take medication for diabetes or blood pressure. Please speak with your doctor first.