Best food to bring to school thats still good when you bring it there and wont be spoiled and also nutritious?

nowadays, school food has been so unhealthy, it turned some of my friends overweight (I'm serious) Even I'm starting to pack on some pounds. Does anyone know a good lunch I can bring to school everyday that would be Very low fat, sodium, and carbs, won't be bad cold, and can be a replacement for cold tuna that I... show more nowadays, school food has been so unhealthy, it turned some of my friends overweight (I'm serious) Even I'm starting to pack on some pounds. Does anyone know a good lunch I can bring to school everyday that would be Very low fat, sodium, and carbs, won't be bad cold, and can be a replacement for cold tuna that I bring to school everyday?

P.S NO TRUKEY, its so wierd =X
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