Hi there!
Yes, you can eat one meal a day if you like. I have had success with 2 – late breakfast/early lunch and then as early a dinner as I can (6-7pm).
Whilst away for work I have also done good breakfast and them loads of water through the day and no dinner. That probably wasn’t enough calories for 8 weeks though.
It is actually good to have as long a fessible gap between meals – also helps keep blood sugars level and that’s discussed in the book.
You do what feels best, and so long as you eat the right food, try and keep carbs down and feel full by eating full fats, keeping calories to target, then one meal should be fine.
Good luck! ๐