Can it be that a sugar donut is healthier than a plain muffin? The calorie count is much higher on a plain muffin than a sugar donut. TwoFoods: Food Comparison is a nifty tool to compare two foods side by side to see exactly how they stand up to each other. A plain generic muffin has a whopping 1909 calories, while a sugar raised donut from Dunkin’ Donuts has an average of 230 calories. Very surprising. So it’s time to go do battle and let your body win when you compare foods side by side.