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According to the US National Soft Drink Association (NSDA), consumption of soft drinks is now over 600 12-fluid-ounce [355 mL] servings per person per year.
Apparently, soda consumption in the USA has tripled for boys and doubled for girls since 1978.

A serving size was defined as one bottle, can or glass of cola.

In fact, the CSPI has cited bigger serving sizes as a major reason for increased consumption. In the past 40 years, bottles and cans have ballooned from 61⁄2 fluid ounces (fl. oz.) [192 mL] to 12 fl. oz. [355 mL] and recently to 20 fl. oz [591 mL]. Interestingly, back in the
1950s, Coke's "family size" bottle was only 26 fl. oz. [0.769 L].

j'hésite sur la traduction de ce terme ici
portion ou part de soda me paraît un peu bizarre... dose peut-être ? merci !