Fasting that works with your keto phase.
A fasting timer that tracks your stages — fed, fat-burning, ketosis and autophagy — and adapts the window to the phase you are in, so fasting and keto pull in the same direction.
Less about what — more about when
Intermittent fasting is simply cycling between windows when you eat and windows when you do not. The most familiar pattern is 16:8 — a sixteen-hour fast wrapped around an eight-hour eating window — but the principle scales from a gentle twelve-hour overnight fast to longer protocols.
The point is not deprivation. It is giving your body uninterrupted stretches where insulin stays low, glycogen draws down, and stored fat becomes the obvious fuel. Where most calorie counting fixates on what you eat, fasting adds the lever of when — and the two together are more powerful than either alone.
What happens as the hours pass
Times are approximate and vary by person — but the sequence is the same, and Keto Club's timer shows you where you are.
Fed
0–4 hours
You are digesting and absorbing your last meal. Insulin is raised and the body is storing, not burning.
Fat-burning
~4–12 hours
Glycogen stores run down and the body starts reaching for fat as fuel. This is where a keto diet gives you a head start.
Ketosis
~12–18 hours
The liver produces ketones in earnest. Already keto-adapted? You arrive here faster and feel steadier doing it.
Autophagy
~18+ hours
Cellular housekeeping ramps up as the body recycles worn components. The longer-fast stage many people are chasing.
Keto makes fasting easier — and the reverse
If you have ever tried to fast on a high-carb diet, you know the problem: blood sugar swings leave you ravenous a few hours in, and the fast becomes a battle of willpower. Keto changes that. When your body is already adapted to running on fat, the dip never comes — you glide into the fat-burning and ketosis stages instead of crashing into them.
The relationship runs both ways. Fasting draws down glycogen faster, which speeds your path into ketosis and deepens it once you are there. That is why Keto Club treats fasting as a true pillar rather than a bolt-on: paired with keto-cycling, it compounds the result.
A timer that knows your phase
Stage-aware countdown
Rather than a blank clock, the timer marks your fed, fat-burning, ketosis and autophagy stages, so each hour means something.
Windows that adapt
Your suggested fasting window flexes with your keto phase — tighter through strict keto, gentler in maintenance — and you can always set your own.
One log, one picture
Fasting sits alongside your food log and COREFit sessions, so the whole plan lives in one place instead of three apps that never talk to each other.
Fasting is one of three pillars
Keto-cycling
Phase in and out of ketosis on purpose, so low-carb stays sustainable for the long run.
Explore keto-cycling →COREFit
No-gym training you can do in any space — and a fasted morning session can deepen the burn.
Explore COREFit →Set sensible starting targets with our free calculators.
Intermittent fasting — answered
What is intermittent fasting?
Intermittent fasting is cycling between periods of eating and not eating. A common pattern is 16:8 — a 16-hour fast and an 8-hour eating window — but the right window depends on your goals, your routine and, in Keto Club, the keto phase you are currently in.
Why pair intermittent fasting with keto?
Keto lowers your reliance on glucose, so when you fast your body slips into fat-burning and ketosis sooner and with less hunger. The two reinforce each other: keto smooths the fast, and fasting deepens the metabolic benefits of keto.
What are the fasting stages the timer tracks?
Keto Club's timer tracks four stages — fed, fat-burning, ketosis and autophagy — so you can see roughly where your body is as the hours pass, instead of staring at a plain countdown.
Does my fasting window change with my keto phase?
Yes. Keto Club adapts your suggested window to the phase you are in — tighter windows pair naturally with the strict keto phase to accelerate fat-burning, while gentler windows suit maintenance. You are always free to override the suggestion.
Is intermittent fasting safe for everyone?
Intermittent fasting suits many people but not all. If you are pregnant or breastfeeding, have a history of disordered eating, are diabetic, or take medication affecting blood sugar, speak to a qualified healthcare professional before starting. Keto Club is an educational and tracking tool, not medical advice.
Run your first fast
Start the timer, watch your stages, and let your window adapt to your keto phase — free.