Beauty sleep and good face cleansing won't be enough to help you look younger.

Sugar breaks down the collagen on your skin, making you age faster. The over consumption of sugar has also been linked to skin problems like rosacea, eczema, and acne. Be mindful if your skin is very dry or too oily may be a reaction of too much sugar in the body.
Eating foods that are high in sugar do not satisfy your hunger.

for full info
http://www.lifebuzz.com/sugar/2/