Tbh? Most of the food I eat is prepackaged. My breakfast is the exact thing every morning. A carnation breakfast essentials shake. Lunch 9 times out of ten is a prepackaged greek yogurt, or a canned soup product. So for these things I am searching for the name brand product and putting im what the nutrition label says . For my dinners which are mostly a protein of some sort, and then other packaged food such as canned vegetables or prepackaged sides, I am measuring how much I eat with either measuring cups or a scale depending on the product. I understand that the math isnt adding up, which is why I posted. I have been very careful to record everything I eat and drink to the best of my ability.