Take a break - No one can stay focused all day - so take time out, preferably a sensory rather than a cerebral break in some way. In reality most people can concentrate for 45-50 minutes maximum, before losing concentration or efficiency......... so take time out to be more efficient & reduce stress too.
One of the things I LOVE about the Beachbody programs is that most of them come with meal plans and recipes. Focus T25 comes with 25 recipes that have 5 ingredients and it takes just a few minutes to prepare. Check this delicious turkey chili