From the original calculations, every 1000 people eat a unit of food per turn. Originally, units were "Tons" of a resource, which would be 2,200 lbs, or 2.2lbs per person. I think you got that.
If we use Pop Tarts as the staple of your people, a regular 2 Pop Tart package is 3.67 oz. That's about 400 calories per package. At 2.2 lbs of food per person, that's about 19 single pastries (9.5 packages) per person, per day, or 200*19 = 3,800 Calories per day.
3,800 Calories should be enough to keep your people from starving; in fact, if they're not out working in the fields they're probably overweight.