Methodology

Why answers are split by goal

"Does this break my fast?" has no single answer. It depends on what you are fasting for. A substance can be irrelevant to a calorie deficit, disqualifying for autophagy, and forbidden before a blood test, all at once. Collapsing that into one yes or no is the most common mistake made by pages answering this question, so every entry here is split by goal.

Evidence

Answers are grounded in primary research where it exists, cited inline. Where the evidence is thin, mixed, or drawn only from animal studies, the entry says so rather than choosing a confident answer.

Review

No clinician reviews this site. Entries are researched and source-checked by the author, who is not a doctor or a dietitian. When an entry is marked reviewed, that means its sources have been verified: every mechanism claim traced to a primary source that was checked to exist and to say what the entry says it says. It does not mean a clinician signed it off.

That is a weaker guarantee than clinical review and it is stated plainly rather than implied. Every entry carries a reviewer field that renders nothing while it is empty, which is today. The editorial and review policy sets out how a verdict is reached, what evidence counts, and what would change one.

How this site makes money

Fasting Index sells no supplements and takes no affiliate revenue from any product it writes about. This is a permanent constraint, not a current state of affairs. The reason is simple: nearly every page currently ranking for these questions is published by a company selling the product in question, and an independent answer is only worth something if it stays independent.

What this site is not

It is not medical advice. Fasting is not safe for everyone, and it is specifically not safe for some people who are pregnant, taking medication, or managing a medical condition. Where a question is medical, such as fasting before surgery or blood work, the honest answer is to follow your clinic.