Tomato juice (and other vegetable juices) do not cause sugar spikes followed by insulin spikes. So it is insulin-wise drink. It mean people should increase i… Video Rating: 0 / 5 Question by thursday915.2008: Is 8oz of tomato juice equivalent to one vegetable serving? (Such as a cup of Campbell’s tomato juice?) Best answer: Answer by Christian Ait’s actually multiple servings… one serving of vegetables is 4 oz… do the math, if you drink one glass that gives you 2 servings. What do you think? Answer below!