Yes. Random ideas to follow.
Cut down on the salt. (everyone)
Cut the extraneous sugar out of the buns; cut down the burger bun size to the size of the small patty. Add fiber. (McDs)
Make the hamburger the default, not the cheeseburger. Also, there has to be a healthier catsup available than that HFCS with a tomato waved over it. Have malt vinegar an option for fries.
It’s possible to microwave an unbreaded fish square to order. Portillo’s can do this well (Chicago and some southern states). Ditto for a salmon burger. And the amount of tartar sauce on Filet-o-Fish, although the nectar of Olympus, could easily be cut back.
If White Castle can deliver a veggie slider, and Burger King a veggie burger, why can’t McD’s?
Beef-a-Roo is a regional fast food chain that has dishes of broccoli just ready to steam upon ordering, alone or to top a healthy stuffed baked potato. I’m certain that green beans or sweet corn could be other healthy options. (Well, perhaps not on a potato.) There are cole slaw recipes which aren’t too heavy on mayo or on sugar. Hard to eat with fingers, but a great option instead of fries. Some chains do it: all should.
Wendy’s used to have flatbread/pita sandwiches in the 1990s which were delicious. I’m not a vegetarian, but I loved their vegetable wrap. A lot of Mediterranean food could be served quickly: falafel and hummus, various wrap options. Brown rice seems to be going over well for Chipotle.
Sugar-free AND caffeine free options as drinks. Why in the hell are both Diet Coke and Coke Zero the only options without sugar? Would it kill McD to serve caffeine free Diet Coke? Or sugar free lemonade? Culver’s has this thought through: diet and regular root beer; diet and decaf diet Pepsi. Wendy’s has diet lemonade.
The trend of sweet iced tea must die. Seriously, fast food moguls. Drop it. Then you can go all virtuous about it.
Finally, I don’t think fast food breakfasts are fixable, except by substituting turkey variants for ham and sausage. A person is pretty far gone if they don’t have time to eat a Clif bar, or similar. Bagels should be shrunk, just like buns should.