How can we help?
Find answers to common questions about Fast36 and 36-hour fasting.
Frequently Asked Questions
What is a 36-hour fast?
A 36-hour fast means going without food for 36 consecutive hours. For example, if you finish dinner at 7 PM on Monday, you would not eat again until 7 AM on Wednesday. This type of extended fast allows your body to progress through all six metabolic stages, including autophagy.
How do the fasting stages work?
Your body goes through six distinct metabolic stages during a 36-hour fast: Fed State (0-4h) where nutrients are absorbed, Early Fasting (4-8h) where blood sugar stabilizes, Glycogen Depletion (8-12h) where stored glucose is used, Fat Burning (12-18h) where ketone production begins, Deep Ketosis (18-24h) where fat burning accelerates, and Autophagy (24-36h) where cellular cleanup and renewal occurs.
Can I edit my start time?
Yes! If you forgot to start your fast at the right time, you can tap on the "Start" time shown on the active fast screen and adjust it to when you actually began fasting. This ensures your progress tracking remains accurate.
What notifications will I receive?
Fast36 sends you milestone notifications as you progress through each fasting stage. You'll be notified when you enter a new stage (like Fat Burning or Autophagy) and when you're close to completing your fast. You can customize these notifications in the Settings.
Is my data stored online?
No. All your fasting data is stored locally on your device only. Fast36 does not require an account, does not connect to any servers, and does not collect any personal information. Your fasting history and settings stay completely private on your iPhone.
Can I skip a week?
Yes! If you have a scheduled fast but can't do it this week, simply tap "Skip This Week" when you receive the reminder. The app will skip the current week and remind you again the following week at your scheduled time.
Is it safe to fast for 36 hours?
For most healthy adults, occasional 36-hour fasts are generally considered safe. However, fasting is not recommended for pregnant or breastfeeding women, people with eating disorders, those with certain medical conditions, or people taking medications that require food. Always consult with a healthcare professional before starting any fasting regimen.
What can I consume during the fast?
During your fast, you can have water, black coffee (no sugar or cream), and plain tea. Staying hydrated is important. Avoid any caloric beverages, sweeteners, or foods as they can break your fast and interrupt the metabolic benefits.
Getting Started
Download Fast36
Get the app from the App Store. No account or sign-up required.
Set Your Schedule
Go to Settings and choose your preferred fasting day and start time. The app will remind you each week.
Start Your Fast
When you're ready to begin, tap the "Start Fast" button. The timer begins and you'll see your progress through each stage.
Track Your Progress
Watch the circular progress indicator fill as you move through the six fasting stages. Each stage shows you what's happening in your body.
Complete and Celebrate
After 36 hours, you'll see a completion screen with your stats. Your fast is automatically saved to your history.
Tips for Successful Fasting
Stay Hydrated
Drink plenty of water throughout your fast. Herbal tea and black coffee are also acceptable.
Start After Dinner
Beginning your fast after dinner makes the first 8-10 hours easier since you'll be sleeping.
Stay Busy
Keep yourself occupied with activities. Light exercise, reading, or work can help distract from hunger.
Break Fast Gently
End your fast with easily digestible foods. Avoid large, heavy meals immediately after fasting.
Still need help?
Can't find what you're looking for? We're here to help.
Contact Supporthello@akshit.io