Don’t forget loads of salt!

Like– every step of the way, fast food places have an opportunity to aim for ‘healthier’ or ‘more delicious’ choices, overwhelmingly with profit-making in mind. That’s the main thing to keep in mind.

IIRC, McD’s and various other chains even design venting and such to get the smell of the cooking food (chemically enhanced) in to the surrounding area. You know, so that more people can pay a fortune to get a food rush that doubles as a health disaster.