The sugar high is all fun and games until the resulting sugar crash affects the quality of your day. You may experience a crash after indulging in high amounts of carbohydrates, especially simple sugars such as cake and ice cream. Although the human body needs sugar, it also needs the amount of sugar to remain at a consistent level. Sugar crashes generally cause us to be incredibly distracted throughout the day, which leads to a lack of productivity and concentration.Confusion, abnormal behaviour, the inability to complete routine tasks and blurred vision are also common symptoms.