Many small shops, even pharmacies, close for lunch. Plan errands around the 2-hour midday break.
Restaurants serve lunch 12:00–14:30, then close until dinner service at 19:00 or later. Don't expect food in between.
Brasseries serve continuously and are a safe bet for late lunches. Cafes serve light food (croque-monsieur, salade, omelette) all day.