Firstable, I have to say that sugar is considered a drug but Why shouldn't we eat it?
Well, I think that I am going to explain two things before that we could get a answer.
The first thing is relationated with a healthy diet. We have to do a balance diet. It doesn't mean that you have to suffer eating only healthy food. I think if you get a good balance between your calories at day, you can eat sugar but it doesn't mean that you have to abuse.
The second thing is relationated with sports. You should find a sport that you like doing it because if you practise a sport but you don't like it, finally you will quit it( we can see the tipical example in the real life: Imagine that someone sign up in the gym but it is not his sport, probably in a couple of weeks, he will finish to quit the gym).
Despite sugar is dangerous for the health, I think that if you get a good balance between the quantity of sugar in your diet, probably sugar could be healthy even.
In conclusion, I think is not neccesary that you have to suffer with your diet like a professional athlete but you should eat healthy and sometimes you can eat sugar but also you need to practise any sport where you are comfortable.