The Precautionary Principle for Novel Foods
Treat new foods and supplements as guilty until proven innocent
- Difficulty
- Easy
- Time to result
- ~ongoing to results
- Steps
- 4
- Confidence
- 72%
The Precautionary Principle inverts the legal default of innocent-until-proven-guilty when applied to what you put in or on your body. Because nutrition science leans on weak observational data and long-term randomized trials are rarely feasible, harm is often confirmed only after decades of exposure, as with man-made trans fats, leaded gasoline, and benzene in sunscreen. Rather than adopting a novel food or compound on the assumption it is safe, you treat it as guilty until proven innocent: you ask how long it has been in the human diet, whether it is whole-food derived or industrially processed, and whether long-term safety data exists. Where a proven ancestral alternative exists, you default to it. The principle converts scientific uncertainty into a conservative, actionable choice rather than paralysis.
Origin
Lugavere frames it as the rational response to a food industry that has repeatedly introduced ingredients later found harmful. He cites partially hydrogenated trans fats, once sold as the heart-healthy alternative to butter and lard, as the archetypal case of a novel food adopted before its danger was known.
Core principles
- 01When data is incomplete, default to caution rather than adoption
- 02The food industry has repeatedly foisted harmful ingredients on the public before recall
- 03Novelty in the food supply is itself a risk signal, not a neutral fact
- 04A justice-system standard (innocent until proven guilty) is wrong for what you ingest
- 05Ancestral, minimally-processed foods carry a longer safety track record
How to run it
- 1
Establish the food's history in the human diet
Ask whether the item has been eaten for millennia or only entered the food supply in the last several decades. Novelty is a risk flag.
Pro tip Extra virgin olive oil and sesame oil pass; refined, bleached, deodorized seed oils from soy or corn do not.
- 2
Classify it as whole-food or industrially processed
Determine whether the food is made by simple pressing or extraction, or by high-heat chemistry and refining. Ultra-processing is a defining feature of the modern chronic-disease crisis.
Watch out A product can be marketed as healthy while being ultra-processed, so read past the front-of-pack claim.
- 3
Check for long-term human safety data
Look for whether randomized long-term human trials exist, not just short-term or animal studies. Absence of evidence of harm is not evidence of safety.
Watch out Much nutrition evidence is observational and easily confounded, so weak data should not be read as reassurance.
- 4
Default to the cautious, proven alternative
When data is missing and a well-established option exists, choose the option with the longer track record. There is little downside to waiting.
Pro tip You lose nothing by using olive oil instead of an unproven seed oil while the evidence matures.
In the wild
Partially hydrogenated fats were engineered from vegetable oil to behave like saturated fat at room temperature and sold for decades as the heart-healthy replacement for butter, ghee, and lard. Only after generations of near-daily human exposure were they found to be poisonous to the brain and cardiovascular system, and ultimately outlawed by the FDA. A precautionary stance would have avoided them precisely because they were novel and unproven.
→ Decades of avoidable harm that a guilty-until-proven-innocent default would have prevented.
Faced with a shelf of refined seed oils marketed as heart-healthy, a shopper applies the principle: the seed oils are roughly 60-70 years old in the diet and heavily processed, while extra virgin olive oil is millennia old and made by pressing olives. With a proven alternative available and no long-term seed-oil safety data, they default to olive oil.
→ A low-risk everyday choice made without needing to resolve the scientific debate.
Common mistakes
Reading weak data as reassurance
Absence of proof of harm gets treated as proof of safety, which is exactly the inversion the principle warns against.
Applying it to well-established foods
Turning a caution rule into blanket fear of all foods ignores that millennia-old whole foods have already earned their safety record.
Is it for you?
Best for
Anyone deciding whether to adopt a newly popular food, oil, or supplement without waiting decades for confirmation of harm.
Not ideal for
Situations where a food has millennia of safe human use and the risk framing would only create needless anxiety.
From the transcript
“the approach should instead be guilty until proven innocent and that's sort of what the precautionary principle sort of implies”
“when we don't have enough data to act on something or to make a fully informed decision then we take the more cautious approach”
From the episode
How To Optimise Human Nutrition - Max Lugavere - #560
Max Lugavere