No — during your fasting window in the Lasta Fasting Tracker, eating solid food is not allowed. The core principle of intermittent fasting (IF) is to abstain from consuming calories from food and most beverages to allow your body to enter a fasted state. This supports benefits like fat burning, improved insulin sensitivity, autophagy, and metabolic health.
However, certain zero- or very low-calorie beverages are generally permitted (and often encouraged) during fasting periods, as they don't significantly trigger insulin or end the fasted state for most people following standard IF protocols (like 16:8, 18:6, etc., available in Lasta).
What Is Allowed During Fasting Windows?
These options help with hydration, curb hunger, and maintain energy without breaking your fast:
- Plain water (still or sparkling) — Your #1 go-to; stay hydrated! Aim for at least 2–3 liters per day.
- Black coffee (no sugar, milk, cream, or sweeteners) — Provides a caffeine boost and may suppress appetite.
- Unsweetened tea (black, green, herbal, or plain) — Calorie-free and soothing; great for variety.
- Apple cider vinegar (in moderation, diluted in water) — Some users add 1–2 tsp to water; it's low-calorie and may support digestion/blood sugar, but don't overdo it.
- Bone broth (minimal calories, in very small amounts) — A gray area; it's nutrient-rich and helpful for longer fasts (>24 hours) to replenish electrolytes, but it contains some protein/calories (~30–50 per cup) and can technically break a strict fast. Use sparingly or only if your plan allows "dirty fasting" — check your specific fasting goals.
Key rule in Lasta and most IF approaches: Anything with meaningful calories (especially carbs, proteins, or fats) will break your fast by triggering a metabolic response (e.g., insulin release). Stick to zero-calorie options for the purest benefits.
What Should You Avoid During Fasting?
- Any solid food
- Caloric beverages (juices, sodas, milk, plant milks, alcohol)
- Sweetened drinks/coffee/tea (including artificial sweeteners in strict fasting, as some debate their impact)
- Bulletproof coffee, MCT oil, or added fats
- Supplements with calories/carbs/protein (check labels)
Lasta-specific notes: The app's fasting tracker focuses on time-restricted eating windows. It doesn't strictly police what you consume during the fast (no calorie input required), but following clean fasting guidelines maximizes the physiological effects the app helps you track (progress, streaks, body status insights, etc.).
Tips for Success
- Use Lasta's reminders to stay on track with your window.
- Log hydration, mood, or energy in the fasting section to monitor how your choices feel.
- If you're new, start with beginner plans (e.g., 12:12 or 14:10) where the fasting window is shorter and easier to manage with just water/coffee/tea.
- For longer fasts, prioritize electrolytes (via water or permitted options) to avoid fatigue/headaches.
Sticking to these guidelines keeps your fast effective and sustainable — enjoy the clarity and energy that come with it! ⏳💧
If you're unsure what counts as "breaking" your fast for your specific plan, want personalized advice, or notice differences in the app, check the Fasting tab for your current setup or contact Lasta support via the in-app menu. Keep going strong!
👉 Need more help?
Tap here to contact our support team — we’re happy to help! 😊