Sentence The phrase "most unhealthy" is correct and can be used in written English.
For example, "Despite my best efforts, I consumed the most unhealthy foods every day."
The most unhealthy country in Europe.
"Some say this is the most unhealthy town in America.
"We're the most unhealthy country in Europe," he said.
I do admit this, it is most unhealthy.
We want a strategy to stop Britain being the fifth most unhealthy country in the world.
Robin: "I'm the most unhealthy person in the whole wide world.
The big box of fried chicken is the most unhealthy thing present in the backstage area.
It's a bit of a cliché to assume that all students go for the cheapest, most unhealthy food.
It's probably the most unhealthy thing for the human brain to do, but that's the way it is.
We need also to stop price promotions in supermarkets, which are almost entirely on the most unhealthy foods and encourage greater consumption.
I was brought up to believe that frozen food was evil, and Iceland was the most unhealthy shop on the planet.
