Intermittent Fasting & Mindful Eating
Track your fasts, log your meals, and see how they affect each other — all in one place.
From digesting your last meal to burning fat to deep cellular repair, Atomic Fast shows the phase you’re in, timed from what you actually ate.
Works for iOS & Android
0–4 hours
Your body is still processing your last meal. Insulin is
elevated as nutrients are converted into energy.
4–8 hours
Blood sugar is settling and insulin is dropping. Your
body is starting to shift away from using food as its
main fuel.
8–12 hours
Your stored energy reserves are running low. Your body
is getting ready to switch to burning fat — the
crossover point.
12–16 hours
Lipolysis is now dominant. Your body is actively
breaking down stored fat into ketones, and growth
hormone spikes to preserve lean tissue.
16–24 hours
Ketone levels are high, fueling your brain and body. You
may notice sharper focus and steady energy as cellular
repair kicks in.
24+ hours
Peak cellular recycling. Damaged proteins and
organelles are being broken down and recycled. This is
the deepest level of cellular rejuvenation.
AI-First Smart Meal Logging
No searching. No scrolling. No guessing — six ways in, one tap out.
Point your camera at any plate. AI
identifies every item and its full
nutrition — in seconds.
Just type what you ate in your own
words. AI figures out the portions,
nutrition, and everything else.
Scan any barcode to pull nutrition
from 2.5M+ products — imported
instantly.
Forgot to log? Pick a meal photo
from your gallery and AI breaks it
down, just like a live snap.
No barcode? Snap the nutrition
label and AI reads every value for
you — no typing.
Tap to log a glass. Track daily
water intake right alongside your
meals and fasting window.
Fasting + Food
No other app connects both sides. Your meals make your fasts smarter. Your fasts make your meals smarter.
Weekly calorie rings, daily macro breakdown, water intake, nutrient tracking, and AI-powered metabolic insights on every meal you log.
22 hours deep in ketosis? The app knows. Log a meal right from the fasting view — it adjusts your timeline, goals, and recommendations automatically.
How long until you’re back to burning fat? When will digestion finish? Atomic Fast shows you.
Smart Insights
Atomic Fast finds patterns across your meals, fasts, sleep, and activity — then tells you what’s actually making a difference.
You consume 256 more calories on fasting days — your body is overcompensating. Splitting your eating window into 2 meals instead of 1 large one could help.
Your sleep quality holds steady at 95% on fasting days. 16:8 isn't disrupting your recovery — you're in a sustainable rhythm.
Your time to fat burn jumped from 4.9h to 6.1h this week. Heavier carbs at dinner are delaying ketosis — try shifting carbs to your first meal.
Your resting heart rate spikes 8 bpm higher on nights you eat after 9 PM. Late meals are keeping your metabolism elevated when it should be winding down.
You eat 1.3 fewer meals on fasting days but maintain similar calorie intake. Your meals are more nutrient-dense — quality over quantity.
You hit your eating window 4 out of 8 days — but on the days you did, your avg fast was 17.2h. Consistency is the missing piece.
Your intake swings ±818 cal day-to-day (avg 2086). This kind of variance can stall progress — even when your average is on target.
Your health data from Apple Health or Health Connect — sleep, heart rate, activity, and more — becomes fasting intelligence.
7 engines that analyze your data
Fasting Patterns
Meal Impact
Break-Fast Score
Readiness
Health Patterns
Fasting × Nutrition
Nutrition TrendsSmart Nudges
"Fat burning activated" — right when it happens
Electrolyte tips that adapt to your fast
Nudges based on what you ate, not just the clock
Your fasts, meals and health data are analyzed on your device. Only AI meal scans leave it: the photo or text goes to Google Gemini and isn’t stored by us. With Atomic+, backups go to your own iCloud or Google Drive.
Your own iCloud or Google Drive, with Atomic+
Your data is processed locally
Insights built from your
patterns
Download free on iOS and Android.
Works for iOS & Android
