Excess sugar adds many calories, without any beneficial nutrients, to an individual’s diet. The body either uses the sugar for energy or stores it in the form of adipose tissue (fat). This biological process leads to both physical and emotional problems.
Obesity, diabetes, heart disease and many more physical problems can be directly attributed to over eating sugar. The most commonly known disease caused by excess sugar is type 2 diabetes. Nearly 90-95% of the 26 million people with diabetes have type 2. Insulin, a hormone produced by the pancreas, enables sugar in the blood stream (also known as glucose) to enter and be used by the body’s cells. When sugar is eaten, the amount of glucose quickly rises in the blood stream. This causes the pancreas to rapidly produce more insulin. With too much sugar intake over a prolonged period of time, one of two problems that cause type 2 diabetes will occur: the body’s cells no longer respond to insulin, or the body’s over-worked pancreas stops producing insulin. This leads to many other health problems, such as kidney and nerve damage. 
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Excess sugar can also alter a person’s emotions by, similar to drugs, causing “highs and lows”. Quickly, after ingesting excess sugar, the combination of increased glucose and dopamine in the bloodstream leads to increased energy levels and happiness. As insulin is produced and the glucose and dopamine levels stabilize, many people feel wiped out, tired and irritable. This is known as a “sugar crash” or a “sugar low”. The sugar low leaves the body craving more sugar, in order to achieve the recent high in energy and happiness it experienced. This is why so many people that consume candy in the afternoon experience a craving for more candy later in the day. This often leads people to eat more sugar than their body needs. Lowering the amount of sugar one consumes can easily prevent these physical and emotional issues.
http://www.webmd.com/diet/ss/slideshow-sugar-addiction
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