I appreciate the challenges of travel, but trying to wring fresh food out of a chain restaurant is like blood from a stone unfortunately. The model of a chain restaurant is to transport and sell dehydrated non-perishable items that will absolutely malnourish and toxify you no matter how "clean" it looks. I promise you they get their meat and produce from the least scrupulous suppliers they can find.
I don't know if this advice applies to where you travel but my first choice is always grocery store salad/deli bars. The quality varies but you can take your time inspecting it before you buy it. As a last resort I'll check a convenience store refrigerator for boiled eggs, cheese, carrot sticks, and fruit.
Lots of: urban hiking, cycling, sprinting
Lots of: fresh meat, seafood, eggs, organs, tubers, starch fruits, vegetables, meat fat, dairy fat, oil fruits
Some: cured meat, dairy protein, sweet fruits, rice, pulses, tree nuts, oil seeds
Minimal: soy, refined proteins, sugar, liquid carbohydrate, grains, refined oils, peanuts