how can i follow the MFP to be very accurate Calories

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hello wonderful people

how is everybody , if yo reading this or u will replay , would say thank you in advance


here we go , my problem is with the give calories form MFP , if i have been given 1500 calories , and i add all food that might be 1500 C or maybe less.

my question how can i know exactly the calories in the food ?>

second question , sometimes i drive or chat for 4 hours ?should i count them

thank u