You can eat a diet that involves a lot of fast food and still be shredded. When I'm arguing trials in circuit courts I can be stuck off in small towns for weeks at a time and circuit trials means all day in court and all night preparing for the next day in court, no time for meal prep. I eat a lot of fast food when I'm doing that. I add/change ingredients, combine different burgers, whatevs but you can make a perfectly healthy meal at mcdonalds. KFC is the best though. Ignore the sides and just eat the chicken. Ketosis awaits.