Question: what fast food restaurants serve keto food?
Answer: 6 fast food restaurants with low-carb and keto-friendly options. Here are some top keto-friendly and low-carb options at popular fast-food and fast-casual chains. ... 
McDONALDS. ... 
BURGER KING. ... 
WENDY'S. ... 
TACO BELL. ... 
CHIPOTLE. ... 
PANERA BREAD.