I've read Lustig's book, and my recollection is that he says that more than 10% of your daily calories from (all, both added sugar and naturally included sugar, if I remember correctly) sugar is too much. So if you're eating 2000 calories/day, then 200 calories from sugar, which means 200/4 = 50 grams total (including added sugar).
Separately, on the sugar science website they say:
> our scientific team recommends keeping all added sugars below the recommended limits of 6 teaspoons/day (25g) for women and 9 teaspoons (38g) for men.
I just watched a documentary where Lustig said sugar in fruit is fine because the fibre in the fruit means you absorb the sugar over a period of time, meaning the liver doesn't get one big hit.
Roughly 25 years ago when I was a kid, I remember drinking orange juice out of small 4" glasses with oranges on the side at diners and in homes. These glasses hold about 6 oz of juice, which is about 85 calories.
These glasses have been replaced by much larger ones. These days a 'small' juice is 12-16 oz, or 150-200 calories, which is just as bad as pop.
Portion sizes are growing with the collective waistline of America.
I thought the fiber was good because it made you feel fuller and you don't eat as much, not that you somehow interacted with sugar to "disable" it. What's the connection?
Separately, on the sugar science website they say:
> our scientific team recommends keeping all added sugars below the recommended limits of 6 teaspoons/day (25g) for women and 9 teaspoons (38g) for men.
http://sugarscience.ucsf.edu/sugar-faq.html