It'd be good to follow up on this for you then. Def. see the talk it mentions, and read around on the studies. I think the last number I heard was ~50g/day (keep consumption under this.)
It's also worth noting that it's not -only- a volume issue but a rate issue. This is why -refined- sugars are particularly bad, because they are immediately available (unlike say, eating a fruit, where it takes time for your body to tear apart the fibers to get at the sugar).
Fructose metabolism is not rate-regulated, and a cell metabolizing fructose quickly uses up all its energy (ATP) and slows down. So it's not really safe to consume -refined- fructose in general because it will shut down the liver while it is being metabolized, and this can allow compounds that should -not- be in the bloodstream (such as fructose itself) to get into the bloodstream because the liver is tied up and can't take them on.
It's also worth noting that it's not -only- a volume issue but a rate issue. This is why -refined- sugars are particularly bad, because they are immediately available (unlike say, eating a fruit, where it takes time for your body to tear apart the fibers to get at the sugar).
Fructose metabolism is not rate-regulated, and a cell metabolizing fructose quickly uses up all its energy (ATP) and slows down. So it's not really safe to consume -refined- fructose in general because it will shut down the liver while it is being metabolized, and this can allow compounds that should -not- be in the bloodstream (such as fructose itself) to get into the bloodstream because the liver is tied up and can't take them on.