What happens if excess of calorie is taken?

Too many calories will cause you to gain body fat. You might want to take up a sport to help burn off calories and then you can eat whatever you wish.

Calories are not an actual physical compound of any sort, they are just a summarization of a food's energy value that is easy for us to understand. The number of calories is determined from fat, sugar, and carbohydrates; all are sources of energy.

All energy in the body is stored as fat (lipids), so when you have too many calories you're really having too much fat, sugar, AND carbohydrates. All off this excess energy not used by the body is stored as fat and so too many calories will cause you to gain fat.