I dont know how kids can eat so much sweets!
My OH's 5 year old tonight, was determined he never wanted his dinner (Spag bol). So i said he gets no sweets unless it is eaten. He fair scoffed it then and is now tucking into a sweet which he bought with his own pocket money!
We have rules in our house which are easy to follow.
1. Eat all your breakfast - Lunch - Dinner
2. Keep your room clean
3. Go straight to sleep at night with no messing around.
I dare say very easy to follow to get a sweetie! Plus they are only here a few days a week!