16:8
Fasting Guide 10 min read
Beginner's Guide to 16:8 Intermittent Fasting
Everything you need to know to start the most popular fasting protocol. Tips, schedules, and what to expect.
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Smart Fasting.
Stay Hydrated.
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Packed with Features
Everything you need to transform your health
FastFlow AI combines intelligent fasting tracking, hydration management, and AI-powered coaching into one seamless experience.
Smart Fasting Timer
Track your fasting windows with a beautiful timer. Support for 16:8, 18:6, 20:4, 23:1 (OMAD), and 14:10.
AI Fasting Coach
Get personalized advice from your AI coach. Ask about nutrition, hydration, and get instant expert guidance.
Hydration Tracking
Never forget to drink water. Smart reminders, daily goals, and intuitive logging keep you hydrated.
AI Food Scanner
Snap a photo of your meal and let AI analyze the calories instantly. No manual entry needed.
Weight Tracking
Log your weight, set goals, and visualize progress with beautiful charts. See trends and milestones.
Fasting Zones
See exactly which metabolic zone you are in — from anabolic to fat burning to deep ketosis.
Streaks & Scores
Build fasting streaks, earn daily health scores, and stay motivated with achievements.
5 Languages
Available in English, German, French, Italian, and Spanish. Your health journey, in your language.
5 Protocols
Choose your fasting protocol
From gentle 14:10 to intense OMAD. Find the schedule that fits your lifestyle.
14:10
Beginner
14h fasting10h eating
Gentle and easy to maintain. Perfect starting point.
Premium
Most Popular
16:8
Popular
16h fasting8h eating
Most popular protocol. Great balance of results and ease.
Free
18:6
Moderate
18h fasting6h eating
Enhanced fat burning. Good for experienced fasters.
Free
20:4
Advanced
20h fasting4h eating
Warrior Diet. Intense results for dedicated fasters.
Premium
23:1
Expert
23h fasting1h eating
OMAD — One Meal a Day. Maximum fasting benefits.
Premium
Quick Setup
Start in 4 simple steps
Getting started with intermittent fasting has never been easier.
01
Download the App
Get FastFlow AI free from Google Play or App Store. No sign-up required to start.
02
Set Your Protocol
Choose your fasting protocol — 16:8 for beginners or go advanced with OMAD.
03
Start Fasting
Tap to begin your fast. Track your zones, hydration, and get AI coaching in real-time.
04
See Results
Watch your streaks grow, weight drop, and health score improve day by day.
User Reviews
Loved by thousands
Join the community transforming their health with FastFlow AI.
4.8from 2,500+ reviews
“FastFlow AI made intermittent fasting so simple. The AI coach kept me motivated, and the hydration reminders were a game-changer. Best fasting app I have tried!”
S
Sarah M.
Lost 12kg in 3 months
“The fasting zones feature is brilliant. Knowing exactly when I'm in fat burn or ketosis keeps me going. The food scanner saves me so much time logging meals.”
J
James T.
Fasting for 6 months
“Love that it's available in Spanish! The streak system is so motivating. I have never been this consistent with any health app before. Highly recommend.”
M
Maria L.
Health enthusiast
“The daily health score gives me something to aim for every day. Water tracking with reminders has improved my skin and energy levels dramatically.”
D
David K.
Lost 8kg in 2 months
“Finally an app that supports the 23:1 protocol properly! The AI coach understands advanced fasting and gives great advice. Worth every penny of premium.”
A
Anna P.
OMAD practitioner
“I recommend FastFlow AI to all my clients. The combination of fasting, hydration, and calorie tracking in one app is exactly what people need.”
M
Michael R.
Fitness trainer
Expert Guides
Learn about fasting
Expert guides to help you on your fasting journey.
IF
Guide 10 min read
Best Intermittent Fasting Schedule
Compare all fasting schedules — 14:10, 16:8, 18:6, 20:4, and OMAD. Find your perfect protocol.
Read article
EAT
Nutrition 9 min read
Intermittent Fasting Diet: What to Eat
Complete diet guide — best foods, what to avoid, and sample meal plans for maximum weight loss.
Read article
5Z
Science 7 min read
5 Fasting Zones Explained: Fed to Ketosis
Understanding the metabolic zones your body goes through during fasting. Know when fat burning kicks in.
Read article
18:6
Guide 8 min read
18:6 Intermittent Fasting: Full Guide
How 18:6 fasting works, benefits for weight loss and ketosis, meal planning, and getting started.
Read article
H2O
Hydration 6 min read
How Much Water While Fasting?
The science behind hydration during fasting. Daily water goals and tips for better results.
Read article
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Ready to transform
your health?
Join thousands already using FastFlow AI to lose weight, stay hydrated, and build healthy fasting habits. Download free and start your first fast today.