The Sun - Nutritionist comment on chocolate and how it could be good for you

The Sun needs a nutritionist to comment on chocolate and how it could be good for you.

1. Is chocolate ever really good for you?
2. How much chocolate can you eat a day for it not to impact your weight?
3. What are some healthy alternatives other than fruit for those who have a sweet tooth?
4. Roughly how much exercise do you have to do (running on treadmill for example) to burn off a slab of chocolate?

The deadline is tight on this one - so can you respond asap