In the United States, Ancel Keys and his colleagues at the University of Minnesota first fed high-sugar diets to middle-aged men and also reported that their cholesterol levels rose. Keys then repeated the studies with college students and reported that the sugar-rich diets seemed benign to them, reaffirming to Keys that he was right and Yudkin was wrong. But it is possible, if not likely, that men in their forties and fifties respond differently to sugar than they would have in their late teens and early twenties.