1. Pizza used to be a lower-class food. Originally, pizza in Naples was just a cheap meal for working people. After Queen Margherita tasted it, pizza became famous and went global.
2. Tomatoes were once thought to be poisonous. In the 18th century, Europeans thought tomatoes were poisonous because their acidity reacted with pewter dishes , causing lead poisoning.
3. Coca-Cola used to contain cocaine. When it was first made in 1886, Coca-Cola used coca leaf extract before finally removing it in the early 1900s.
4. Ketchup was once sold as medicine. In the 1830s, ketchup was marketed as a remedy
for indigestion , and there was even a pill version sold in pharmacies.