Search 50+ drinks, coffees, teas, sodas, waters, sweeteners, and supplements to get instant verdicts on calories, insulin impact, and autophagy status.
Get real-time beverage guidelines and live autophagy stage tracking inside the free Fasting Tracker app.
Get Free Fasting Tracker App →A central rule of intermittent fasting is maintaining metabolic fasting state by preventing spikes in blood glucose and insulin. When caloric energy (carbohydrates or amino acids) enters the digestive system, the pancreas secretes insulin, which shifts cells from nutrient breakdown (catabolism / lipolysis) to nutrient storage (anabolism / lipogenesis).
Moreover, cellular autophagy is regulated by nutrient sensors such as mTOR (mammalian target of rapamycin) and AMPK. Even small amounts of amino acids (such as leucine in BCAAs or whey) or carbohydrates can trigger mTOR signaling and temporarily pause cellular autophagy, even if the total caloric intake is under 20 calories.
| Beverage Category | 🟢 Safe (Clean Fast) | 🟡 Caution (Dirty Fast) | 🔴 Breaks Fast Completely |
|---|---|---|---|
| Coffee & Espresso | Plain Black Coffee, Espresso, Cold Brew (no milk or sugar). | Black Coffee + 1 tbsp Heavy Cream (50 kcal). | Lattes, Cappuccinos, Bulletproof Coffee, Sweetened Creamers. |
| Teas & Herbal Infusions | Green Tea, Black Tea, Matcha, Peppermint, Chamomile, Hibiscus. | Flavored Fruit Teas with natural dried fruit pieces. | Chai Tea Latte, Sweetened Iced Tea, Honey Lemon Tea. |
| Waters & Liquids | Filtered Water, Mineral Water, Unflavored Sparkling Water, Lemon slice water. | Diet Sodas (Diet Coke, Coke Zero), Zevia, Kombucha (under 10 kcal). | Coconut Water, Fruit Juices, Vitamin Water (Sugar), Energy Drinks. |
| Sweeteners & Drops | 100% Pure Stevia Extract, Liquid Monk Fruit, Erythritol (Zero insulin). | Sucralose (Splenda), Aspartame, Acesulfame Potassium. | Raw Honey, Maple Syrup, Agave Nectar, Table Sugar, Coconut Sugar. |
| Supplements | Unflavored Creatine, Salt / Electrolyte Drops, Apple Cider Vinegar. | Unflavored Collagen Peptides (under 20 kcal), Fish Oil capsules. | BCAAs / EAAs, Whey Protein Shakes, Gummy Vitamins. |
The impact of non-nutritive sweeteners on fasting depends on the compound:
No! Plain black coffee contains under 2 calories per cup and zero carbohydrates or protein. The caffeine and chlorogenic acid in black coffee actually enhance fat oxidation and stimulate autophagy.
Squeezing a fresh lemon slice (approx. 1-2 tbsp of juice) into water adds under 3 calories and negligible fructose. It does not break a fast and helps support kidney health during fasting.
Bone broth contains approximately 35-45 calories and 6-9g of protein per cup. Drinking bone broth WILL technically break a clean fast and pause autophagy. However, it is widely used in 'dirty fasting' protocols and extended fasts to supply sodium and electrolytes.
