In an article 'Bitter truth about sugar' (:-)) in The Hindu today, a nutritionist from Fortis Hospital says that daily recommended intake of sugar is 9 teaspoons (7 if you are a woman). 1 teaspoon is about 5 ml.
A can of cold drink contains 7 teaspoons of sugar. So, if you have a can of cold drink, your sugar requirement is done for the day. You can't have tea, sweets, and all those processed foods.
If you cross the limit, you are increasing your chance of dying from heart disease. Excess sugar accumulates to develop obesity, diabetes, impaired immune system, tooth decay, etc.