Comment by Yizahi

The problem is that to a European citizen this is a bit unexpected. In Europe, in all countries, you can find roughly the same level of "safeness" of food across all tiers of stores. Go to a cheapest one and the most expensive one, and the yogurt, tomatoes or meat would be approximately the same quality and have the same nutritional components. The only difference would be that expensive store would additionally carry some imported fancy tomatoes or some fancy steak cuts. But those steak cuts would be subject to the same standards as a cheap chicken meat in the cheap store.