Is there any way to convince your friends to eat healthier, especially

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Is there any way to convince your friends to eat healthier, especially if you don't live with them?

Friend A
>eats a lot of fast food because they don't know how to cook well
>barely eats fruit and vegetables, except what comes in their cheeseburgers
>basically a diet of carbs, meat and dairy (mostly in the form of cheese)
>their roommate encourages them to eat better when they make shared meals, but when A is making food for themselves, it's back to normal
>not overweight, actually probably closer to being underweight than anything, because they're very active

Friend B
>eats more fresh produce than Friend A but diet isn't very varied
>diet is also high in fat, sodium and sugar
>is busy stressed quite a lot so buys themselves junk food 'because they deserve a treat'
>lives with their mother and brother; they're both picky eaters which limits B's diet even more
>overweight, probably obese in that "no one realises you're obese because fat people are the norm these days"

I'm not saying I'm perfect or anything, but I'm getting concerned for both of them. They're both often sick. Friend A also has vitamin/mineral deficiencies and Friend B takes ages to heal when they get an injury, which they often do because they're rather clumsy. We're all in our mid-20s, so they're not going to be able to eat they way they do much longer.

Any advice?