It looks like when the largest serving size of wine by the glass was unavailable, people shifted towards the smaller options, but didn't then drink the equivalent amount of wine. People tend to consume a specific number of units in this case glasses regardless of portion size. So someone might decide at the outset they'll limit themselves to a couple of glasses of wine, and with less alcohol in each glass they drink less overall.
Alcohol consumption is the fifth-largest contributor to premature death and disease worldwide. According to the World Health Organisation, the harmful use of alcohol led to around three million deaths worldwide in 2016.
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