10 Most Unhealthy Fast Foods (6) 6. M&M McFlurry® Image Source: Tumblr User Milkshakes are usually very sugary and high in calories, and the colourful M&M McFlurry is no exception. 930 calories in just one shake makes up more than a third of an average person’s daily allowance! < Previous 1 2 3 4 5 6 7 8 9 10 Next > Tweet Pin It