Help with food diary

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HI there...I searched database for macaroni cheese.. which i had some of today. when i found it, i added it to my diary.. but it shows no fat/carb/protein count.. just calories... i then went back into database and based on info that i found online, i entered values to what i am only guessing to be most accurate... when i saved changes.. i went back to my diary, and it has changed the value of calories but stil 0 fat and 0 carbs...0 protein etc... can someone tell me how this all works?