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Fasting science, product updates, and tips to get the most from Atomic Fast.
Product · iOS · Android Atomic Fast Now Speaks 10 More Languages Atomic Fast 1.3.0 runs in Danish, Dutch, French, German, Italian, Norwegian, Portuguese, Russian, Spanish and Swedish — the app, your widgets, notifications and Watch. Read article -
Nutrition · Research Food Texture, Eating Speed and Feeling Full A new appetite study adds nuance to the ultra-processed food debate. What food texture changed, what fullness tests didn't show, and how to read the results. -
Fasting Science · Intermittent Fasting Alternate-Day Fasting: Do People Actually Stick to It? A year-long trial put alternate-day fasting against plain daily calorie cutting. Weight loss tied, but more people quit fasting every other day. What that means for your plan. -
Nutrition · Intermittent Fasting Bloating While Fasting: It's Usually the First Meal Why you feel bloated on intermittent fasting, the swallowed air, sugar-free gum and oversized first meal behind most of it, and the red flags that mean see a doctor. -
Metabolic Health · Blood Sugar Why You Feel Cold While Fasting (and When It's a Problem) Feeling chilly a few hours into a fast is usually normal. Here's why it happens, how to warm up without breaking your fast, and the signs that mean you should see a doctor. -
Intermittent Fasting · Metabolic Health Is a 10-Hour Eating Window Enough? Two UC San Diego and Salk trials put people with metabolic syndrome on a 10-hour eating window. The gains were real but modest, and they came mostly from eating less. -
Fasting Science · Meal Timing Is a Shorter Fasting Window Better? A 4-Hour vs 6-Hour Study A UIC trial pitted a strict 4-hour eating window against a looser 6-hour one for eight weeks. The stricter window didn't win. Here's what that means for the window you pick. -
Nutrition · Intermittent Fasting Constipation While Fasting: Why It Happens and How to Fix It Why intermittent fasting can back up your digestion, the water, fiber and movement fixes that actually work, and the red flags that mean it's time to see a doctor. -
Meal Timing · Intermittent Fasting Fasting During Ramadan vs. 16:8: How to Adapt Ramadan's dawn-to-sunset fast works differently from a daytime 16:8: no water, a night-time eating window, fixed hours. What changes and how to fast well and safely. -
Intermittent Fasting · Meal Timing 12:12 Fasting: The Gentlest Way to Start 12:12 fasting means a 12-hour eating window and a 12-hour fast. It's the smallest, easiest step into intermittent fasting and a realistic on-ramp before 16:8. -
Fasting Science · Intermittent Fasting Keto Breath While Fasting: Why It Happens and How to Fix It That fruity, nail-polish smell on your breath during a fast is acetone from burning fat. Why it shows up, how to tone it down, and the one case where it's a warning sign. -
Fasting Science · Weight Loss Does Time-Restricted Eating Do Anything Special? A Johns Hopkins feeding trial gave everyone the same food. A 10-hour eating window added no extra weight loss, and no edge on appetite hormones or inflammation either. -
Fasting Science · Metabolic Health What Really Changes After 3 Days of Fasting In a 7-day water fast, researchers tracked 3,000 blood proteins, and the body-wide changes only showed up after day three. What that means, and why it isn't your 16:8. -
Meal Timing · Intermittent Fasting How to Fast on a Shift-Work or Irregular Schedule Nurses, drivers and night-shift workers can still fast. The trick is treating your eating window as a body-clock schedule, not a fixed set of hours on the wall clock. -
Intermittent Fasting · Education Who Should Not Do Intermittent Fasting? Who should skip intermittent fasting and who should see a doctor first, from pregnancy and eating-disorder history to insulin, sulfonylureas and SGLT2 diabetes drugs. -
Intermittent Fasting · Blood Sugar Dizzy While Fasting: When It's Normal and When to Stop Why fasting can leave you dizzy or lightheaded, the simple fixes that usually work (water, salt, standing up slowly), and the red flags that mean eat now and call a doctor. -
Metabolic Health · Nutrition Do Small, Frequent Meals Boost Your Metabolism? Eating every few hours to stoke your metabolism is one of the stickiest food myths. What the research shows, and why a normal fasting window won't slow your metabolism. -
Intermittent Fasting · Nutrition How to Break a Long Fast Without Wrecking Your Stomach After a 24-hour or multi-day fast, the first meal is where people go wrong. The order to eat in, what to skip, and when refeeding needs a doctor rather than a recipe. -
Blood Sugar · Intermittent Fasting Why Fasting Makes You Hangry (and How to Handle It) Getting short-tempered during a fast is real, not a lack of willpower. Here's what research says about hunger and irritability, and the simple moves that calm it down. -
Intermittent Fasting · Education What to Expect in Your First Week of Intermittent Fasting A realistic look at your first week of 16:8: the hunger, the headaches, the short temper, the metabolic switch, and how long it usually takes before fasting feels normal. -
Autophagy · Fasting Science Does Fasting Clean Out Your Cells? The Autophagy Evidence Fasting reliably switches on autophagy in animals, but the popular 16-hour claim runs well ahead of the human evidence. Here's what research shows, and what it doesn't. -
Meal Timing · Intermittent Fasting How to Fast While Traveling and Across Time Zones Keeping a fasting routine on the road: what to do on the plane, how to move your eating window across time zones, and whether a fast can really help reset your body clock. -
Meal Timing · Intermittent Fasting Fasting and Sleep: Why You Wake at 3 A.M. and What Helps Whether a fasting window helps or hurts your sleep comes down mostly to when you eat. Here's what the trials show, and how to time your last meal so it doesn't cost you sleep. -
Intermittent Fasting · Meal Timing Intermittent Fasting Glossary: 16:8, OMAD, TRE and More 16:8, OMAD, TRE, 5:2, autophagy, ketosis, clean fast: what the intermittent fasting terms actually mean, which claims are oversold, and the three you need to start. -
Fasting Science · Research Is an 8-Hour Eating Window Bad for Your Heart? A 2024 headline tied 8-hour eating to a 91% higher risk of heart death. The study is now peer reviewed. Here's what it measured, what it can't show, and what to do. -
Feature · Meal Timing When to Start Your Next Fast After a Meal Does your fast start at the last bite or once digestion is done? How Atomic Fast's digestion estimate and its three start options keep the next fast in your hands. -
Meal Timing · Intermittent Fasting Fasted Workouts: When They Help and When to Skip Them Fasted workouts are fine for easy, shorter sessions and burn a little more fat in the moment, but eat first for long or heavy efforts, and stop if you feel dizzy. -
Intermittent Fasting · Fasting Science How to Deal With Hunger While Fasting (It Comes in Waves) Hunger during a fast rises and falls in waves tied to your usual meal times. Here's why it passes on its own, and the simple tactics that get you through the worst of it. -
Intermittent Fasting · Education Free Fasting Timer Apps: What to Actually Look For Most fasting timers are free to download and then hit you with a paywall. Here's how to tell a truly useful free fasting app from a trial in disguise. -
Meal Timing · Fasting Science Is Breakfast Really the Most Important Meal of the Day? Randomized trials have tested the 'most important meal of the day.' Here's what they found about breakfast, weight, and metabolism — and why skipping it is fine on 16:8. -
Intermittent Fasting · Meal Timing 8 Beginner Fasting Mistakes (and the Easy Fix for Each) The eight most common intermittent fasting mistakes new fasters make, and the simple fix for each one — so your first two weeks feel manageable and the habit sticks. -
Intermittent Fasting · Meal Timing Why a Fasting Timer Needs a Food Log A fasting timer only tracks half the day. What you eat in your window decides whether the fast was worth anything — here's why we built both into one app. -
Intermittent Fasting · Meal Timing How to Pick a Fasting Window You'll Actually Keep How to choose an intermittent fasting window that fits your real day — your hunger, your meals with people, and your workouts — so you actually stick with it. -
Intermittent Fasting · Weight Loss I'm Fasting but Not Losing Weight: The Usual Culprits You're sticking to your window and the scale won't move. Here are the six things that quietly stall intermittent fasting weight loss, and how to fix each one. -
Intermittent Fasting · Weight Loss 16:8 vs OMAD vs 5:2: Which Fasting Schedule Fits Your Life? 16:8, OMAD, and 5:2 all work by helping you eat less — so the real question isn't which is strongest, it's which one you'll actually keep. Here's how to pick. -
Fasting Science · Intermittent Fasting Does Intermittent Fasting Actually Work? What 22 Trials Say A Cochrane review pooled 22 trials and found fasting doesn't beat plain calorie cutting for weight loss. Here's what that really means, from an app that won't spin it. -
Fasting Science · Intermittent Fasting How the Atomic Fast Timer Shows Your Metabolic Phase How the Atomic Fast timer counts your fast and shows the metabolic phase you're moving through by the clock, plus how logging a meal suggests when to start your next fast. -
Intermittent Fasting · Meal Timing Your First 16:8 Day: A Realistic Hour-by-Hour Walk-Through What a first day of 16:8 fasting actually feels like, hour by hour — from your last bite, through the hunger waves, to your first meal the next day. -
Fasting Science · Intermittent Fasting Does Fasting Burn Muscle? What the 16:8 Lifting Study Found The fear that fasting eats your muscle is real, but a controlled 16:8 trial in trained lifters tells a more specific story about what protects muscle and what doesn't. -
Intermittent Fasting · Fasting Science Coffee, Tea, and What Actually Breaks a Fast Black coffee, tea, diet soda, a splash of milk, bulletproof coffee — here's what keeps you fasted, what quietly ends it, and why the answer depends on your goal. -
Intermittent Fasting · Fasting Science Fasting Headache: Why It Happens and How to Stop It That dull ache around hour 14 is common and usually harmless. Here's what's likely behind a fasting headache, how to shut one down fast, and how to stop them coming back. -
Fasting Science · Metabolic Health How Long Does It Take to Get Into Ketosis While Fasting? Most fasting charts promise ketosis at hour 12. The real timeline is slower and more personal. Here's what actually happens, and how to tell where you are. -
Fasting Science · Meal Timing Early vs. Late Eating Window: Does When You Fast Really Matter? A new one-year study followed people who did 8-hour time-restricted eating early, late, or on their own schedule. Here's what it found about meal timing, keeping weight off, and protecting muscle. -
Metabolic Health · Blood Sugar Does 16:8 Fasting Actually Lower Blood Sugar? What 23 Trials Show A December 2025 review pooled 23 trials on 16:8 time-restricted eating. Here's what it found for fasting glucose, insulin resistance, and cholesterol — and what it didn't settle. -
Fasting Science · Weight Loss Intermittent Fasting vs. Calorie Counting: Which Actually Works Better? A large 18-month trial put intermittent fasting head-to-head with calorie counting. The weight loss was nearly identical — but one was far easier to stick to. Here's what that means for you. -
Autophagy · Fasting Science When Does Autophagy Actually Start During a Fast? The honest, evidence-based answer to how long you need to fast for autophagy — what the research really shows, why the popular hour-counts are shaky, and how to think about it. -
Nutrition · Fasting What to Eat When You Break Your Fast (and What to Skip) The best foods to break a fast for steady energy and blood sugar — plus what to avoid — and why the meal that ends your fast matters as much as the fast itself. -
Fasting Science · Metabolic Health The Metabolic Phases of a Fast, Hour by Hour A clear, science-backed timeline of what happens in your body during a fast — from digestion to fat-burning, ketosis, and autophagy — and how to know which phase you're in. -
Feature · iOS iCloud Backup, Google Drive Sync, and Data Export Are Here Your fasting data is now protected. Back up to iCloud or Google Drive, restore on any device, and export your data in CSV or JSON. -
Engineering · iOS Why Atomic Fast is the Smallest Fasting and Calorie Tracking App on the App Store Most fasting and calorie tracking apps are 100–300 MB. Atomic Fast ships under 20 MB on both platforms with more features. Here's the engineering philosophy behind the difference. -
Launch · Android Atomic Fast is Now on Android Three days after our iOS launch, Atomic Fast lands on Google Play. Full feature parity, native Material Design, and everything you need to connect fasting with nutrition. -
Launch · iOS Atomic Fast is Live on the App Store After months of development, Atomic Fast is officially available on iOS. Here's what we built, why we built it, and what's coming next.