not early in the game... by the time your cities start to starve, you should have discovered refrigeration and give them farmland 
and then, just transform a plain to grassland if necessary, to give them an even number of food produced... it's that simple to avoid starving in big cities

and then, just transform a plain to grassland if necessary, to give them an even number of food produced... it's that simple to avoid starving in big cities

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