What we mean by processing level, and why it is not a safety score

Every ingredient report on this site carries a processing level. It is one of the first things people ask about, and one of the easiest to misread, so it is worth being explicit about what it does and does not claim.

What it measures

Processing level describes how much industrial transformation separates the ingredient from the thing it came from.

At the low end sit ingredients that are recognisably their source: an oil that was pressed, a flour that was ground. In the middle sit ingredients isolated from a food by physical or mild chemical means — a protein separated from milk, a fibre extracted from a root. At the high end sit ingredients built through substantial chemical modification, where the finished molecule does not occur in the starting material in any meaningful quantity.

That is a descriptive scale. It is about distance travelled, not about danger.

Why it is not a safety score

The two come apart constantly, in both directions.

Sucralose is heavily processed — a chlorinated derivative of sucrose that does not exist in nature — and is also one of the most thoroughly evaluated sweeteners in the food supply, with decades of toxicology behind its approvals. Palm oil is far less processed and carries its own well-documented concerns, some nutritional and some environmental.

Meanwhile sugar is minimally processed by any reasonable definition and remains the ingredient most implicated in the diseases people are actually trying to avoid.

If processing level were a safety score, those three would rank in an order that nobody would defend.

Why we still publish it

Because it answers a question people legitimately have, and because it correlates with things worth noticing. Heavily processed ingredients tend to be ones with no culinary tradition behind them — no centuries of ordinary human consumption to draw on, only the formal safety assessment. Some people weight that. That is a reasonable preference and it deserves data rather than vibes.

It also tracks, loosely, with the kind of product an ingredient tends to appear in. A long list of highly processed ingredients usually indicates a formulation solving many problems at once, and that is a fair signal about the product even when no individual ingredient is a concern.

Read it alongside the rest

Processing level sits next to regulatory status, the intake levels assessed, documented effects, and alternatives — because it only means something in that company. Any one of those numbers alone will mislead you.

Browse the reports and you will see the same four questions answered every time, in the same order.