Truth: Experts used to coach people with diabetes to limit their sugar intake, but that advice has changed. “Sugar is nearly impossible to avoid, and it doesn’t cause diabetes or raise your blood sugar any more than other carbohydrates,” Campbell says. Today, nutritionists teach people with diabetes to fit sugar and sweets into a healthy diet. Whether or not you have diabetes, 10 percent of your calories can come from added sugar. That’s around six teaspoons of sugar per day for women and nine for men.