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Dear Mrs principal,

Thanks for spending time reading this, I just want to say that the school should stop selling fast food at the canteen. Fast food contains too many calories and fats, which is certainly bad for children. Instead, the school should sell vegetables and organic foods, as it's much better and healthier than fast food. Eating fast food is linked to a higher risk of obesity, depression, digestive issues, heart disease and stroke, type 2 diabetes, cancer, and early death. So it's not good for children to eat fast food, it can influence the future of the children. 

Again, thanks for reading and best regards,

(Your name)