The longevity space is full of competing claims — Zone 2 vs. HIIT, fasting vs. caloric restriction, carnivore vs. Mediterranean. We compare each pair on outcomes measured in human studies, with the study behind every call.
The page compares popular longevity protocols item by item and gives each item an evidence call based on the cited human research, so you can see where well-known protocols agree with the evidence and where they go beyond it.
Calls summarise the evidence for typical adults and can change as new trials report. A protocol's popularity is not evidence: for example, fish oil supplements, a staple of many protocols, did not lower cardiovascular events or cancer in the large VITAL trial (VITAL).
Look at the items marked as well supported first, and treat items with weaker calls as optional or experimental. Use the comparison to question a protocol, not to copy one wholesale.
Each row compares one outcome measured in human studies and says which option the evidence favors, if either: "Favors", "Both help", "Similar" or "Not enough evidence", with the study behind it.
This page used to show a score from 1 to 10 for each side of every row, added up into totals. No study produces numbers like that, so we removed them. Randomized trials carry the most weight; cohort studies and surveys show associations, and each note says which kind of study it rests on. Supplement comparisons follow our Supplement Evidence Database.
Last reviewed October 2, 2026.
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