If you're on the go or forget to pack a keto-friendly lunch, don’t fret. Keto fast-food options are limited, but they exist. You’ll want to do your research on what’s out there (McDonald’s, Chipotle, and other chains have options), but if you’re short on time, a salad with grilled chicken, nonstarchy veggies, and olive-oil-based dressing is a good choice.