Introducing Nova Fast: See What Fasting Actually Does to Your Body

Most fasting apps are countdown timers with a green circle. You start a fast, you watch the hours tick by, and you stop. That’s it.

Nova Fast is different. It shows you why you’re fasting — the actual biological changes happening inside your body at each stage of your fast.

7 Biological Phases, Tracked in Real-Time

As you fast, your body moves through distinct metabolic stages. Nova Fast tracks all seven:

Anabolic — Your body is still processing your last meal, using glucose for energy.
Glycogen Depletion — Liver glycogen stores are being used up. Your body is preparing to switch fuel sources.
Fat Burning — Glycogen is depleted. Your body shifts to burning stored fat for energy.
Ketosis — Fat breakdown produces ketone bodies, which become your brain’s primary fuel. Mental clarity often improves here.
Autophagy — Your cells begin recycling damaged components. This is the cellular “cleanup” phase that has driven much of the scientific interest in fasting.
Growth Hormone Boost — Human growth hormone levels increase significantly, supporting muscle preservation and fat metabolism.
Immune Regeneration — Extended fasting can trigger stem cell-based regeneration of the immune system.

Each phase is displayed in real-time as you fast, with clear explanations of what’s happening and why it matters.

Every Popular Fasting Protocol, Built In

Nova Fast ships with all the protocols people actually use:

16:8 — The most popular intermittent fasting schedule
18:6 — A step up for experienced fasters
20:4 — The warrior diet approach
OMAD (23:1) — One meal a day
14:10 and 12:12 — Gentler options for beginners

Don’t see your schedule? Create a fully custom protocol with any fasting and eating window.

Widgets That Keep You on Track

Nova Fast includes home screen and lock screen widgets showing your fasting timer, current biological phase, and streak — all at a glance without opening the app. When you’re 14 hours into a 16-hour fast, you want that information fast.

More Than a Timer

Beyond the core fasting tracker, Nova Fast includes:

Water Tracking — Log water intake with customizable daily goals and reminders. Hydration matters more during a fast.
Fasting Journal — Record how you feel, your energy levels, and what you ate during eating windows. Spot patterns over time.
Body Measurements & Weight — Track weight and body measurements with charts and trends. See how fasting correlates with physical changes.
XP Gamification — Earn experience points for every completed fast, level up through 30 ranks, and unlock 29 achievement badges. Build streaks that keep you coming back.

Built for Privacy

All your data stays on your device. Fasting sessions, journal entries, water logs, measurements, gamification progress — everything is stored locally using Apple’s SwiftData framework. Nothing is sent to external servers.

Get Started

Nova Fast is available now on the App Store. Download it and start your first fast — you might be surprised what your body is already doing.