The church still tells people to fast for 40 days. I’m in Greece right now visiting my partners family and they’ve just ended their 40 day fast. So not sure where you get that from, unless you’re referring to the Western churches, in which case yes, the fast has been abandoned. But in eastern churches all meat, fish, dairy, egg, alcohol, rich/fatty foods and olive oil (depends on the church that one), is banned and followers are expected to spend those days focusing on their faith, attending church and praying. The very religious restrict themselves to one meal a day after sundown, usually a bean soup of sorts or bread and water (my father in law does this). The faithful are also expected to abstain from things like video games, television etc and engage with family, volunteer and do something for nature and people, but that’s not really followed by many.