Probably not, they’d sub in a standby if the launch window allowed for the time to do it. There’s a prelaunch diet plan but it’s hard to find information on it because the space diet gets all the attention. It’s not too exciting though, it’s mostly just a subset of whatever each astronaut considers comfort food with extra attention to nutrition and food safety.

The Apollo 11 astronauts had steak and eggs for breakfast before the launch.