Grand daughter’s size

Is the weight gain as a result of an underlying problem?
You need to check out if she has any problems at school bullying et cetera, does she live in her sisters shadow? Is she the middle child?
All of these could be contributing factors.
You could try an activity with your granddaughter that is something her sisters do not engage in.
Lots you could do,iceskating,swimming horse riding, something that would be just for her ?
Good self-esteem can really help weight loss.

I still wonder if her hormones are beginning to make their presence felt.

Constant grazing could also be a sign of boredom, or it could be comfort eating and have become a Catch 22 situation.

Lots of great advice on here already. just wanted to add - make sure that you're giving her a good role model re snacking/eat healthy food. also, some children (as some adults) are very genetically prone to sugar addiction - and wow is it addictive (one clue is: is there diabetes in the family?) So it's imperative that you get all sugar out of the house (and that's includes hidden sugar in foods like baked beans, tomato ketchup, even some bread!)

I think it's not how she's eating but what she's eating that can be a problem. Get rid of the crisps and sweet stuff apart from a few bags - once they have gone, they have gone.
As someone else said, school holidays, get out and about with all of them. Doesn't have to cost anything, just a walk to the local park or around it if you have to bus/drive there. You may have some resistance but stick to your guns and if she just plonks herself down on the nearest seat, say you'll leave her - walk on but still keep her in sight. Maybe take one of her friends along as well and a small picnic.
Is there anything that she would like to do? A lot at her age want to do street dance so maybe there is a class or group she can join locally? How about joining the Guides/ Scouts?

I go along with comments thatGD is being given more calories than she needs. Encourage her to eat fruit and put lots of veg on her plate at meal times. Cut down on chips and encourage her to eat lean meat and fish. Keep her active. Summer holidays are coming so maybe go swimming or get her out cycling and walking. Please be positive. She doesn't need to hear from you or her mom that sheneeds to lose weight. Healthy eating and being sugar smart is a good way to be for all of us. Good luck. She is a lucky young girl to have some help now - she will thank you in the future.

Fruit kebabs are fun to make and eat. Baby cucumbers are a fun treat.
Solero ice cream bars are Delia IOU’s and under 100 cals. Sushi. Veggie skewers on the bbq.

Lots of good advice here...especially about making healthy snacks available. I’d also suggest moderating portion sizes at mealtimes to counterbalance the grazing.
My younger daughter grazed a lot at the same age and then started occasional binge eating. As her older sister was being treated for anorexia at the time we were pretty keen to do whatever we could. Cognitive Behavioural Therapy with CAMHS did help her to see how patterns grow and how easy it is to get into the habit of seeking a quick reward sensation through food. What’s more important is why she’s not getting any happy feelings from anything else.
Interestingly my daughter admitted years later that she was vaguely aware of wanting to deflect some of the attention her sister was getting back to her. Understandable.

My 7 year old GD is the same. It's a constant whine about being hungry. She's very active with gymnastics, trampoline, and dancing so maybe she needs the food. I have noticed an improvement lately, probably down to learning about good food at school. She would live on biscuits, crisps and sweets given the chance.

Inishowen Sometimes the body feels hungry when, really, it is dehydrated. Your GD lives a very active life. Is she drinking enough? Often a glass of water is all that is needed to assuage the hungry feeling.
That goes for adults, too, who often don’t drink enough liquids.

Between meals only allow health snacks - fruit, carrot sticks etc. Make sure there are not goodies lurking in the cupboard and treats for a Saturday. As as been said, drinking plenty of water helps too.

BradfordLass72 that is a very rude and incorrect response you made to SpringyChicken at 07.00 - I hesitate to think what your books say if you consider her advice is wrong (and for what it's worth, I'm currently doing research on diet at Oxford Uni).

My 7 yo GD too is the same, always hungry but only for junky food. Her 4 yo brother on the other hand is always hungry but for fruit or vegetables, he's like a stick insect. It has struck me reading these posts that it seems to be all girls that have this trait.........I wonder why that should be, there must be an explanation for this?

Up to a point i agree with springychicken everyone i know who is overweight has overweight children
A teacher whose children i use to childmind after school was always cooking and big meals too, very nutricious, but a lot of it, bother her son and daughter were overweight even at 10 and 11 years old,
I think it is rare that it is herditary,

I gather that it is recommended that children have no more than two snacks a day, of not more than 100 calories. The BBC site has some nice suggestions of interesting snacks. Some of them would be too time consuming to make all the time, but personally I find that things like carrot sticks or vegetable fingers are boring and not at all filling. Perhaps the OP's GD might like to get involved in choosing and making some for herself?
www.bbcgoodfood.com/howto/guide/10-snacks-are-under-100-calories

Who does the food shopping? If she's living with you then can't you control what she is grazing on e.g. fruit, carrot sticks. If there are crisps/cakes/biscuits there then that's usually what kids like but if they're not here they can't.

As a HV / school nurse, back in the day when height & weight were recorded regularly, I would say that growing goes in fits and spurts. So most (not all) children will go through a 'taller / skinnier' stage and a 'shorter /dumpier' stage. Looking though family photos you can often see this.
So whilst it's a good idea to follow a lot of the sensible advice on here, I would also say that this may even out.

One of my happiest (rainy) summer holidays was spent learning to cook, and I wonder if that would help?
Otherwise, leaving her quietly alone, whilst keep an eye on her may be helpful - sometimes kids this age can feel a bit overwhelmed by caring families!

I don't see why the rest of the family, 4 adults and 2 children, have to do without treats or cake simply because of one child.
Yes...if all are overweight but to deny treats to all because a minority of one constantly snacks is, IMV, wrong.
I think mum ought to sort it out.
Perhaps you are all living in each others pockets too much, you've done your mothering now leave your daughter to do hers.

I think it is rare that it is hereditary
It has been proved fairly recently that a tendency to being over-weight can be genetic.

Otherwise, leaving her quietly alone, whilst keep an eye on her may be helpful - sometimes kids this age can feel a bit overwhelmed by caring families!
I agree Nannarose, don't make an issue of it as this could possibly lead to problems later on. Cooking and discussing healthy options is fine but not specifically related to weight.

Added to the food issues may be the possibility that this child is coming up for puberty and may be about to start periods at this 10-11 age. She may therefore be hormonally up and down.
Also, whoever suggested low-fat foods, I hope they didn't mean anything other than fruit. Manufactured low-fat foods tend to be overloaded with sugar. Just look at the content of any low-fat yoghurt pot compared with a full-fat one. Though of course, as others have said, there is no call to be snacking all day at all. It's not the healthiest habit to have.

Yes, full-fat yogurts are better, perhaps plain mixed with some fruit.

Comfort eating can be a sign of anxiety; pointing out her weight and wanting to let out her school uniform is going to make her more anxious.

I think body shape is hereditary and although it's not ok to say it I have inherited my father and grandmother's family chunky bones but alas not their height.. I e always had problem with fitted coats, I need a broad cut otherwise they don't fit my back. Wide shoes have always been a necessity.Many bracelets do not fit me, bangles in general I can't get over my big hands, I have to have a longer than average chain otherwise I get strangled/break it, and even rings are a problem. Earrings I'm pleased to report always do fit lol. I'm carrying too much weight ATM which I hope to shed, but exercise can be difficult because of the hip problem. But I have those fitting problems even when I'm not carrying too much weight. My son has inherited the bones and shape. Fortunately my daughter has inherited my mum's basic build which is much daintier, although she has developed muscles with sport and work.
So even when I'm it overweight I never really look slim
With a child I think the key is exercising, and not mentioning dieting as others have said. They are s growing so need sufficient nutritious food. Look at rolly poly babies when they start crawling and running around. There are growth charts in the royal college of paediatrics and child health website so you can see how things look against properly researched charts. But a problem will be getting her weight without making an issue if it, not sure how to do that but someone will have an idea. Interestingly using the usual way to estimate how tall a child will be based in parental height is wrong with my children, I'm average height for a woman, their father was short. They are both quite a bit taller than me, daughter is about her father's height, sin us not quite 6 foot but much taller than his father

Eating more than usual, miserable and very emotional - puberty is hitting girls earlier and earlier, at ten years old I'd be thinking she may well be starting puberty.

BlueBelle...afraid grapes are loaded with sugar and a poor choice for snacking. Most fruit is full of fructose and little else, though citrus has vitamin C. Better choices for snacks are celery, carrots, cucumber, broccoli, tomatoes. Avoid foods labelled low fat, they are full of sugar. Eating yoghurts go for plain ones and add own berries.

Gardening? ballet? riding bikes together. Swimming, soccer, gymnastics. Going to the library and then making dinner together.

Try not to overthink it all. If you can help her just doing things, even housework! it keeps our minds and bodies busy.