Put a ketogenic diet, a Mediterranean diet, a carnivore diet and a whole-food plant pattern side by side and the arguments between their advocates are loud. Look at what each one removes and the arguments look considerably smaller.
The overlap
All of them remove refined flour. All of them remove sugar, particularly in liquid form. All of them remove industrial seed oil. All of them remove ultra-processed food, because none of these patterns has a version of it. And all of them, as a consequence, remove most of the constant snacking that comes with food engineered to be easy to keep eating.
That is four or five changes shared across patterns that disagree about almost everything else. When trials compare these diets head to head, the differences between them are usually modest and the difference between all of them and a standard modern diet is large. The common factor is the more likely explanation.
Most of what people credit to their chosen diet is the removal it has in common with the diets they argue against.
Why ultra-processed is the useful category
'Processed' is too broad to mean anything — cheese is processed, so is butter. The distinction that predicts outcomes in the literature is ultra-processing: food built from industrial ingredients that do not exist in a kitchen, engineered for shelf life and for a texture that does not signal fullness.
Controlled feeding work has shown people eating several hundred calories a day more on an ultra-processed diet than on a matched unprocessed one, without choosing to, and without reporting greater satisfaction. The food is designed to be easy to overeat and it succeeds.
What this means practically
- The kitchen matters more than the macros. Cooking from ingredients removes most of the problem regardless of which pattern you follow
- Read the ingredient list rather than the nutrition panel. The number of items you would not find in a domestic kitchen is the useful signal
- Liquid calories are the highest-return removal for the least effort
- A brand on the front is a reasonable proxy for the thing to avoid, and an unfair one often enough to be worth checking
The order of operations
If you are choosing where to start and the arguments between diets have left you stuck: start here. Remove the five categories, change nothing else, and give it a month. Most of the benefit described anywhere on this site is available at that step, and the question of which pattern suits you becomes much easier to answer once the noise is gone.
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