How to find the right info for certain foods?

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I look on my fitness pal and see pork chops listed at 75 calories for a slice, 256 calories for 100 grams, 185 calories for 10 oz, 165 calories for 3 ounces. I look online and they all have different calories per ounce for baked pork chops.

What do you guys do for food that doesn't come with a nutrition label and researching it comes up with a very diverse answer.

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