"unhealthy lifestyle" is correct and usable in written English. You can use it to refer to a lifestyle that promotes bad habits such as smoking, drinking alcohol, eating unhealthy foods, and avoiding physical activity. For example: "The consequences of an unhealthy lifestyle can be seen in the rise of obesity and chronic diseases".
Along with this is an unhealthy lifestyle.
"Dresses do not facilitate an unhealthy lifestyle," the post argues.
Nice clothes and not being shamed whilst finding said clothes do not cause unhealthy lifestyle choices.
"At the time I was living a very unhealthy lifestyle," he says.
Independent of reproductive hormones, unhealthy lifestyle contributes to IAAT gain.
There is evidence that unhealthy lifestyle habits are a trigger for childhood headaches [22, 26].
Could we decrease headache prevalence by eliminating some negative or unhealthy lifestyle habits?
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK