digest
Short Summary
Main recommendation: During a fast, stick to black coffee, black or green tea, plain water with a small amount of lemon or lime juice, apple cider vinegar, spices, minerals/electrolyte packets, and salt, while avoiding creamers, sugar, almond milk, broth, BCAAs, most pre-workouts, and energy drinks. The video's core rule is that liquids are not automatically harmless to a fast, so each one should be checked for calories and insulin-triggering ingredients. Diet soda is treated as a gray area.
Key Points
- Black coffee and black or green tea are fasting safe because they contribute only a few calories and their polyphenols are said to support autophagy, the cell recycling process of fasting.
- Creamers, sugar, almond milk, half-and-half, and bulletproof coffee break a fast; bulletproof coffee is described as suited to keto rather than fasting, with roughly 300 to 400 calories per cup.
- Branched chain amino acids (BCAAs) break a fast mainly because of leucine, which spikes insulin without contributing to gluconeogenesis, per the speaker's reasoning, though the speaker notes limited scholarly research on this.
- Sucralose can trigger an insulin response, while aspartame technically does not; stevia or monk fruit sweeteners are preferred over sucralose-based options.
- Exogenous ketones and many pre-workouts or energy drinks break a fast depending on their ingredients, so the label determines the answer.
Details Worth Noting
- Concrete instructions:
- Drink black coffee or black/green tea with no sugar, creamer, or fat-based additions; stevia is acceptable if sweetening is needed.
- Add only a small amount of lemon or lime juice to water; the speaker says this promotes gastric emptying and motility, which is treated as an advantage.
- Apple cider vinegar is fasting safe and is commonly taken at the start of the day.
- Use mineral and electrolyte packets containing sodium, magnesium, or potassium (not sports drinks such as Gatorade), which the speaker highly recommends.
- Add spices such as ginger to tea or cayenne to apple cider vinegar; avoid oils such as peppermint oil because they add calories.
- Salt, such as pink Himalayan salt, can be added to tea or coffee for taste and support.
- Check pre-workout labels: skip products containing BCAAs, carbohydrates, multi-dextran, fillers, emulsifiers, or exogenous ketones; simpler formulas with only beta-alanine or citrulline malate are generally fine.
- If using almond milk after a fast, wait until food is in your system if you notice bloating, because it contains phytates.
- Peak Tea Crystals (from Dr. Jason Fung) are presented as a convenient fasting-safe option: small packets of tea crystals with herbs like green ginger that dissolve in hot or cold water. The speaker says the company sent them and that a link is in the video description.
- Diet soda is a gray area: sodas with sucralose can trigger insulin, while aspartame-sweetened diet soda is considered probably fine, though the speaker is reluctant to give it a green checkmark.
- Bone broth breaks a fast because of its calories and collagen, though it can be used in a dedicated bone broth fast under different criteria.
Bottom Line
Most fast-breaking liquids are the ones with added calories, sugar substitutes that affect insulin, or BCAAs, so reading labels is essential before assuming a drink is safe.
