Soft/Energy Drinks?

I know these drinks are bad for you but is it fine to enjoy a couple a week?Soft/Energy Drinks?
It won't kill you efficiently. One problem is the caffeine. If you don't get it everyday you start to cancel from it. Headaches are a symptom. High sugar content is another problem. Better to drink freshly squeezed juices or marine.
They have "diet" and they are better for you calorie and sugar clever.