Would your great-great-grandmother recognize this as food? Would she have had access to it daily?
The Short Answer
If the answer to either question is no, you may be eating something your body isn’t adapted to eat regularly. This isn’t about romanticizing the past: it’s a quick heuristic for identifying modern foods that exploit your biology. Your great-great-grandmother’s diet wasn’t perfect, but it didn’t include engineered products designed to override your satiety signals.
Something to Sit With
Hold up the last packaged food you ate. Would your great-great-grandmother recognize it? Would she have had access to it daily?
If the answer is no, you’re eating something that didn’t exist in the environment your body evolved for. That doesn’t make it forbidden, but it does mean your biology might not handle it the way you expect.
Learn More
The Logic of the Test.
The ancestor test isn’t about historical accuracy. Your great-great-grandmother might have eaten plenty of questionable things, and she certainly lacked knowledge we have now. The test works because it filters out two categories of problem foods:
Novel substances: Things that didn’t exist until industrial food processing. Your body has no evolutionary experience with high-fructose corn syrup, hydrogenated oils, or synthetic flavorings. They are among the markers the NOVA classification uses to flag ultra-processed food, a category that in one controlled trial led people to eat more than a nutrient-matched diet did.[1]
Engineered hyperpalatability: Modern processed foods combine sugar, salt, and fat in ratios that no fresh or raw fruit, meat, or fish met in one paper’s database.[2] And across 38 foods tested at matched calories, the better-liked a food, the less it filled.[3]
The question “Would she recognize this as food?” eliminates products that look like food but are really industrial creations. The question “Would she have access to it daily?” eliminates even recognizable foods that were once rare treats but are now constant temptations.
What Passes the Test.
Clear passes:
- Meat, fish, eggs
- Vegetables and fruits
- Nuts and seeds
- Legumes and whole grains
- Dairy (in most traditions)
- Simple preparations of the above
Clear failures:
- Packaged snack foods
- Sugary cereals
- Soda and sweetened beverages
- Fast food
- Most things with ingredient lists you can’t pronounce
Gray areas:
- Bread (depends on the bread)
- Cheese (depends on the cheese)
- Preserved foods (traditional preservation versus industrial processing)
The gray areas require judgment. Traditional sourdough bread passes; Wonder Bread doesn’t. Aged cheddar passes; processed cheese product doesn’t. The question isn’t whether the category existed, but whether the specific item would be recognizable.
The Daily Access Question.
Sugar is recognizable. Honey is ancient. But your great-great-grandmother didn’t have a bag of sugar in her pantry that she accessed multiple times daily. The scarcity was part of the context.
Many foods that pass the recognition test fail the daily access test, as this page reckons it:
- Fruit (seasonal, not year-round)
- Honey and sweeteners (rare, expensive)
- Fatty meats (feast food, not daily)
- Alcohol (occasional, not constant)
When rare treats become daily staples, they meet a drive that evolved under scarcity: the brain’s pull toward calorie-dense food, which modern foods exploit.[4]
The Evolutionary Mismatch.
This test is really a proxy for the evolutionary mismatch discussed in Ancient Mismatch. Your brain evolved to seek calorie-dense food where it was scarce, and more than 10,000 years of cultural evolution have not changed the genome to match.[4]
The modern environment (abundant, engineered, zero-effort) is not the one those drives evolved in. The ancestor test is a quick way to ask: “Is this a signal my body knows how to handle?”
What This Doesn’t Mean.
The ancestor test isn’t about:
- Eating exactly like ancestors (who often died young from other causes)
- Avoiding all modern food technology (refrigeration is fine)
- Historical purity (your ancestors had plenty of problems)
- Never eating anything processed (this is a heuristic, not a religion)
It’s a decision-support tool. When you’re uncertain about a food, the ancestor test provides quick guidance. When you’re rationalizing something you know isn’t serving you, the test cuts through the noise.
Further reading:
- Guyenet SJ, The Hungry Brain[5] (2017)
- Pollan M, In Defense of Food[6] (2008) — “Eat food, not too much, mostly plants”
- Lieberman DE, The Story of the Human Body[7] (2013)
- Eaton SB & Konner M, “Paleolithic nutrition: A consideration of its nature and current implications”[8] — New England Journal of Medicine, 1985
Written by AI, directed and approved by me. How this is made →