in the food market show demand instead of bonus.

i don;t care if the bonus to unity is.
however seeing the demand is greatly useful to know how much to make.

You can hover over each food and i gives you actual consupion rate. Be aware that consumption is distributed between categories and each food in each category present, so it will not help you with future consumption of food you do not alreadey have.
There is wiki and even several web calculators for food in COI though.