How do I count my Calories, Fats and Carbs Post-op?

I am pre-op and am going to be honest, I need a nutrition for dummies course. I have no idea how many calories is in this, or how many carbs is in that. Is there a book that teaches you how to count these things. I am smart enough to know how to read nutrition labels, but what if they are not available. How many carbs, fats and calories is good for us? Again, thanks in advance for all the help. Only 19 days to go (Lap RNY 08-15-01)

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