Weighing out Canned Veggies?

Hi there! I'm new to all this healthy eating stuff, and I'm a little lost on the subject of canned veggies.

I'm weighing my food to teach myself what a proper portion size looks like, and I'm not sure if I'm supposed to weigh the contents before or after draining? Not sure if they calculate the servings per container size with or without the 'juice'.

Thanks!

~A

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