Yes, that's why I also thought it could have to do with happiness, but:1 building lost per turn look like the city being razed, was it on unrest (likely from the negative happiness)?
- the icon on the right above the next turn button wasn't the unhappiness icon that comes up in the happiness crisis or the torch that comes up when something is pillaged. It was the food icon in red. It's tooltip said "famine in x."
- there was no red fist next to the hungry cities.