To dictate what pocket money can be spent on?

[carolinelucaseshandbag]

My DC's are 8 and 10. Despite taking about it for the last couple of years, we haven't got around to giving them
weekly pocket money. I feel like it's something that we should start doing.
But, my youngest DC is a massive sugar / sweet fiend. At the moment I can limit this as I'm buying. So no fizzy drinks unless it's a special occasion. Chocolate rather than sweets when they get a treat etc.
Once he has his own money, I know he'll want to spend it all on sweets that he will then eat all in one go!
So, do I need to accepting this? Or can I tell him how he can / cannot spend his money? Help!

He's 8. He won't be in a shop alone, will he? So just say no. He can't have sweets.

Remind him that this isn't about the money, it's about his diet and your his mum so it's your job to make sure he eats the right things. He's 8; he will understand that mum is in charge of limiting foods.
The pocket money is his, but that's doesn't overrule your policy on sweets. Keep repeating.

I thought my daughter would do this, but she won't spend it! Just counts it. It's great as I can say no more easily, as that's what pocket money is for. In the first few weeks I did stop her buying overpriced sweets in plastic toy tat. She cried and I felt awful, but that seemed to put her on track for her saving habit.

I never considered this. We've recently stopped giving our 3 year old sweets and his behaviour at home and at nursery has improved a lot. He used to get a sweet for using the potty and then the toilet — I know you're supposed to do a sticker chart but he wouldn't have cared a fig about stickers. Now that he's toilet trained he just gets praise for going and I ate the remainder of the sweets while he was blinking.
I think we might have to set boundaries when he gets pocket money or he'll likely spend it all on sweets and fizzy drinks just like I did when I was a child. I was a massive sugar addict.
You're doing the right thing, I believe. All that sugar is very bad for them.

@Lulualla yes that exactly what I want by do (and will do). I suppose I just wanted some validation from others that this was ok!