Food
Organic versus conventional, honestly
Organic reliably means fewer pesticide residues. Beyond that the evidence gets thinner than the marketing suggests, in both directions.
Last checked July 2026.
This is the question I get asked most about food, and it deserves a straighter answer than it usually gets. Here is what holds up, graded by how confident the evidence lets me be.
Pesticide residues, the strongest finding
Organic produce carries lower odds of detectable pesticide residues (Smith-Spangler 2012, across 237 studies), and switching to an organic diet drops measured pesticide metabolites in urine sharply within days (Vigar 2020, reviewing 35 studies). If you buy organic for one reason, this is the reason the evidence best supports.
Nutrition, genuinely contested
Barański 2014, pooling 343 papers, found higher antioxidant and polyphenol levels in organic crops. Smith-Spangler 2012, across 237 studies, found no strong evidence that organic food is more nutritious. Both are serious pieces of work and they disagree. I am not going to pretend one of them settled it.
Cadmium, real and modest
Barański 2014 also found substantially lower cadmium in organic crops. Cadmium is a heavy metal worth avoiding, and this is a real difference, though a small contribution to overall exposure for most people.
Health outcomes, promising rather than proven
Large observational cohorts have linked higher organic intake with lower rates of several conditions. Observational studies cannot separate the organic food from the people who buy it, who tend to differ in income, diet quality and exercise. Promising, and not proof.
The environment, mixed
Per unit of land, organic farming measures lower on pollution intensity and higher on soil health and biodiversity (Clark and Tilman 2017, comparing 742 agricultural systems). Per unit of food produced, lower yields can cancel that out and sometimes reverse it, because more land is needed. Anyone telling you this one is a clean win in either direction is skipping half the literature.
What I do with all that
An organic badge is worth noting and it does not jump a product up a grade on its own. What goes in the food matters more than the label on the front. And none of this is a reason to feel guilty in a supermarket aisle. Buying the vegetables is the win.
That is the general evidence, not advice about you. If you have a health condition, take medication, are pregnant, or something is worrying you, your GP is the right person to ask.
Where this comes from
- Barański et al. 2014, British Journal of Nutrition 112(5):794–811, meta-analysis of 343 papers
- Smith-Spangler et al. 2012, Annals of Internal Medicine 157(5):348–366, 237 studies
- Vigar et al. 2020, Nutrients 12(1):7, review of 35 studies
- Clark and Tilman 2017, via Our World in Data, comparison of 742 agricultural systems
- Life cycle assessment review, Communications Earth and Environment 2024, 100 LCA studies
I check labels like this one product at a time. If you want me to do it while you shop, the Chrome extension reads the page you are on and tells you what is actually in it.