I don't drink a lot so I haven't really tested my tolerance but so far it's very low (I'm slightly above average height for a woman and a BMI of around 20 last time I checked). I got tipsy from a margarita I had on my birthday (but I hadn't eaten yet). On my trip to my mom's native country the first thing my uncle gave us was a beer, couldn't even drink half of it before I got dizzy (hadn't eaten after a 3 hour flight). Went out with my friend and got really tipsy on a beer and a cocktail (apparently mixing them is a no-no). I figure I'm just a lightweight. I'm not much of a drinker anyway.