This article needs to be interpreted caefully and critically. It is based on a very small sample number, it is retrospective, and it does NOT necessarily mean that dancing causes eating disorders. What it seems to suggest is that people that danced as a child are more focused on their body image.
I think the bigger question is are children who dance now more likely to be healthier as a adult. Health could encompass thigs such as hypertension, diabetes, coronary artery disease, osteoporosis, etc. My generally feeling is yes, they are, but I am unaware of any evidece to support that statement. There is however, fairly strong evidence that the amount of time watching TV in childhhod is proportionally related to problems with obesity.
I would suggest, that with todays current epidemic of obesity, any physical activity which gets kids away from the TV set is good!
How bad is the obesity epidemic? CDC 2000 states that 64% of US adults are either overweight or obese. More worrisome is the rise in obesity in children over the last 20 years. 15.3 % of children aged 6-12 are currently obese, compared to 6.5% in 1980 !
Intrestingly decreasing sedentary activity may be more important than excercise in childhood.