they are basically the ekwifl ebt. the problem is they're both bad. they're both equally toxic. >> since the 1970s sugar consumption has gone down nearly 40%, but high fructose corn syrup has made up the difference. they're both toxic because they both contain fructose. that's what makes them sweet and irresistible. >> we love it. we go out of our way to find it. i think one of the reasons revolutionarily is because there is no stroout prut stuff on the planet that has fructose that is poisonous to you. it is all good. so when you taste something that's sweet, it's an evolutionary darwinian signal that this is a safe food. >> we were born this way. >> we were born this way. >> reporter: central to his theory is that we used to get our fructose mostly in small amounts of fruit, that came loaded with fiber that slows absorption and consumption. after all, who can eaten oranges at a time? as sugar and high fructose corn syrup became cheaper to produce, we began georging. 130 pounds per year. that's one-third of a pound every day. dr. lustig believes thos