What changed in 2023
For 12 years Canada operated on a “low-risk drinking guidelines” framework: up to 10 standard drinks per week for women, 15 for men. In January 2023 the Canadian Centre on Substance Use and Addiction (CCSA), under contract to Health Canada, formally replaced that with a four-tier continuum reflecting two decades of new evidence on alcohol and cancer.
The four tiers
- 0 drinks/week — best for health.
- 1–2 drinks/week — likely to avoid alcohol-related consequences.
- 3–6 drinks/week — increasing risk of breast and colon cancer.
- ≥7 drinks/week — substantially increased risk of heart disease, stroke, and seven types of cancer. Each additional drink raises risk further.
Why ethanol, not the beverage
The 2023 guidance is explicit: risk scales with grams of ethanol, not with whether the alcohol came from beer, wine or spirits. Earlier claims about resveratrol in red wine being protective have not survived systematic review — observational studies suggesting benefit turned out to confound moderate drinking with higher socioeconomic status, fewer chronic diseases at baseline, and “sick quitter” bias (former drinkers reclassified as abstainers).
How serving sizes have drifted
A 2018 Public Health Agency of Canada study found Canadians consistently underestimate how many standard drinks are in a typical pour. Restaurant wine pours average 6 oz (1.2 standard drinks). Modern craft beers run 6–9% ABV (1.2–1.8 standard drinks per 12 oz can). At-home spirit pours from a free hand average 2 oz (1.3 standard drinks). The arithmetic adds up faster than the count suggests.