Even when adjusted for income US citizens pay way more as a percentage of their earnings on food that most western nations, this is a known and demonstrable fact and has been for a long time
Having lived in Europe for three months, US prices for comparable quality are higher, but average food prices at cheaper grocery stores are quite low. Food production is heavily subsidized and regulated in Europe, while the US has higher distribution costs across a larger space and has problems with national and local monopolies like Cargill and a handful of national grocery chains.
U.S. residents spend 6-7% of disposable income on food. Lowest percentage in the world. Russians spend around 40%.