Tannins in pomegranate, walnuts and berries. Gut bacteria convert them to urolithins, and only some people carry the microbes that do it efficiently.
6 foods, grouped by presence band. Bands are used instead of amounts because compound content swings widely with cultivar, soil, storage and preparation — a single number per food would look more precise than the measurements justify.
One of the compounds this food is characterised by in the literature.
Punica granatum
A thick-skinned fruit filled with hundreds of juice-filled arils, each containing a seed. Commercial juice is usually pressed…
Rubus idaeus
A hollow aggregate fruit made up of many small drupelets, harvested from thorny Rubus canes. Fragile enough that most of the crop…
Consistently reported in this food in amounts researchers treat as meaningful.
Rubus fruticosus
Dark aggregate fruit of bramble canes, distinguished from raspberries by keeping the central core when picked. Sold fresh in…
Fragaria x ananassa
The aggregate fruit of a low-growing Rosaceae plant, with the seeds carried on the outside. Sold fresh year-round and frozen,…
Juglans regia
The wrinkled kernel of the walnut tree, unusual among common nuts for being dominated by polyunsaturated rather than…
Recorded in this food without a dependable quantity attached to it.