Best Reddit comment:

This video is extremely important. Sugar in excess acts like an addictive drug. Of course sugar is delicious; it lights up the brain with dopamine just like heroin, but without the extreme withdrawal symptoms. It has become a substance that is closely correlated with addictive behaviors and negative health symptoms. Don't take my word for it. 

Here is some great research if you want to start learning more:

• Potential role of sugar (fructose) in the epidemic of hypertension, obesity and the metabolic syndrome, diabetes, kidney disease, and cardiovascular disease
• Consumption of high-fructose corn syrup in beverages may play a role in the epidemic of obesity
• Daily bingeing on sugar repeatedly releases dopamine in the accumbens shell
• Visualizing neuromodulation in vivo: TANGO-mapping of dopamine signaling reveals appetite control of sugar sensing
• Sugar and fat bingeing have notable differences in addictive-like behavior
• Opiate-like effects of sugar on gene expression in reward areas of the rat brain
• Evidence for sugar addiction: behavioral and neurochemical effects of intermittent, excessive sugar intake
• Sugar-sweetened beverages and cardio-metabolic disease risks

Source: http://reddit.com/r/videos/comments/31e253/sugar_is_killing_us/

Cancer loves sugar.

FED UP says sugar is toxic:

http://pandawhale.com/post/43726/fed-up-movie-sugar-is-addictive-poison-that-makes-people-sick-according-to-robert-lustig