How much lemon would count as a serving of fruit?

I never have much fruit in my house but I have a lemon tree...I was wondering how many juice squeezed from a lemon would be a serving of fruit. Would all the juice from one lemon count as a serving of fruit or more?
juice counts as fruit like orange juice. theres still some pulp in it. It wouldnt be devoid of any nutritional value yo your body just because it is the juice.

Also with 8 oz, if you were to juice a serving of carrots, it would make less than that much.

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