Helping son to develop good habits/ values

Hi,

How can I get my 14 yr old son to value health and want to keep himself healthy? When I see him doing something that's not healthy for him and I tell him that its not good for him, he doesnt seem to care and just continues doing it. For example-he will put boiling water into a disposable plastic cup when making coffee, which leaches chemicals into his drink. He goes to a private school that orders lunch from different restaurants and gives them choices that they can select from and preorder. He always selects the most unhealthy choices on the menu, which I really resent paying for because its so unhealthy and I dont approve of it. But If I don't allow him to choose what he wants, then he says that he will not eat and it will effect his behavior at school in a negative way. He doesnt excercise, rarely plays outside and doesnt want to participate in school sports.(The weather here in south florida is really beautiful now so he doesn't have an excuse). He doesn't even want to go on our family outings, where we usually go to the beach on Sundays. He is the youngest and is the only one currently living at home.

He also is very unproductive with his time. He hates reading (he is dyslexic) so he wont ever read for fun or even for a school assignment (He just looks up a you tube video that summarizes the chapter).

I would love to add things like playing outside, getting excercise and reading to his chores that he is required to do in addition to homework before he gets screen time. But if I add anything new, he will become very explosive and tell me I cant add things, its not part of the deal etc… He also wastes alot of time on screens watching useless things..I would like him to use his time more wisely and be more selective about watching things that he can learn from..He doesnt think ahead about the effects of things and just lives in the moment.
How do I get him to value things such as healthy eating and excercise, fresh air, reading, using time wisely and doing other things that benefit him?