"We can lead a horse to water, but can't make it drink!" The same applies to other people. They are free to make these choices for themselves. I know that it hurts you to see this happen with them, but they must be responsible for their own actions - not you.
Perhaps they may agree to a suggestion from you that YOU cook their meals once or twice a week, and YOU make them healthy ones AND enjoyable. Perhaps in time they may come on board, but if they don't, at least you know that they are getting a couple healthy ones in a week.
As far as exercise is concerned, that again is totally up to them. I understand that you want support, but often we don't get it from family - we have to focus on US and OUR needs! Is there a walking group around you that you can join? If not, have you thought about putting a notice on a couple local notice boards stating a day of the week and time (that suits you best) for others to join in a walk. Make sure that you start it as 'novice walkers' or similar so that it encourages others to begin their journey, rather than be put off as 'too hard'
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