Chocolate is calorie-dense. A 1.55-ounce bar of milk chocolate contains 235 calories. This amount is more than many other snack foods provide. For example, a 1.55-ounce serving of beef jerky provides 124 calories. Consuming too many high-calorie foods can lead to obesity. While you can burn calories through exercise, doing so with chocolate would be time consuming. It would take 57 minutes of weightlifting or 43 minutes of water aerobics to burn 210 calories. The same serving of a dark chocolate bar contains 263 calories, but dark chocolate contains plant compounds that are beneficial to your health, according to a 2012 issue of the "International Journal of Hypertension." Even though dark chocolate contains healthy compounds, it is still high in calories and counts towards your overall calorie intake.