How would you deal with your niece being obese?

So my niece is 4 years old and her doctor said she obese.She weighs like 66 pounds.Her mother is also obese,350 pounds and all I see my niece eating is candy.I know kids eat candy but she always cramming it her month and her parents don't care.Her doctor told the parents she would get made fun of in school(I know it sounds mean but its true)and I know if something don't change soon shes gonna be bigger then her mom.Plus diabetes runs high in are family and I'm concerned about her health.Her paren't's arent doing anything.What should I do to help her.How would you deal with your niece being obese?
I would be concerned too if it were a member of my family but unfortunately there really isn't anything you can do in this situation. She is not your child. If you have children of your own you can model proper eating habits in front of her parents and only provide healthy foods when she is at your home. In my home we don't even have candy unless it is Halloween or something so a child used to eating candy all the time would just be out of luck - we just don't have it. You'd eat an apple or a piece of cheese or you'd go hungry. And you can certainly talk about the diet you provide for your own children or mention some study you read about children and diet - but that is as far as you can go. I'm sure this child's parents are aware that eating healthy is better for them and they know they are obese and why their child is also obese. Knowledge isn't much of a factor in weight - if it were almost no one would be obese. We know what causes obesity and yet we still put junk food in our mouths right? So all you can do is model the behavior you think is right in your own home.

It is an unfortunate situation. How would you deal with your niece being obese?
Ask your neice if she would like to do things with you- take a walk, go swimming, etc.. even if it is mall walking. That will help. Take her to lunch every now and then, and go to Subway or a pita restaurant.
There's really nothing you can do. What she eats is entirely up to her parents. And intervening will probably only result in wounding your relationship with her parents.
Wow, my daughters are 4 1/2 and a little over 30lbs. Being obese can cause so much more than just diabetes. I feel bad for this little girl, but I mean it has gotten pretty bad it seems. I would myself introduce her to healthy foods and stuff, and teach her about being healthy. It is all what you teach and put in front of them. I would start with getting her to eat fruit, as it is sweet like candy. Also get her active, play outside with her, run around.
You could try talking to your niece about the dangers of being heavy and the benefits she will get from being in shape. Hopefully this will motivate her to change her diet and to get more exercise. Unfortunately, she is only 4, so the chances of the happening are very slight but it will probably have more of an affect on her as she gets older. For now, you can only watch what she eats and help her get more exercise when you are with her. You can't change how her parents raise her, unfortunately. Good luck.
there is very little you can do if the parents are not interested. Some people would class this as child abuse...

All you can do is offer her healthy food and encourage her to play at the park and take any exercise you can think of! And as she gets older encourage her to lead a healthy active life of her own choice but i am afraid she has no chance thanks to her mother.
There is nothing you can do actively everyday for the little girl. Fat parents produce fat kids. It's what the parents feed the child. Unless you can help feed her breakfast, lunch and dinner everyday and play with her outside for some exercise. You can't help her, but you can try to help the mother.
Invite your niece over for a few hours every day or a few full days a week, whatever works for you. When she is with you, feed her healthy foods like salads and vegetables in normal portion sizes. Also take walks with her, take her swimming, play at the park, play games that include running, etc. Also, try talking to her mom, but be very careful as to not offend her. Talk about good meal choices for her/her daughter, offer to go shopping with her to find healthy items, and help plan out a weekly menu of healthy choices. Each day, have one sweet treat to reduce cravings and indulgences. This could be a square of chocolate or a small cookie.