Hi Simon, good to hear from you. I do have some thoughts.

Morning: For many, I like the 16:8 intermittent fasting routine. The complete lack of breakfast, except maybe a black coffee, frees up a lot of time and reduces decision fatigue. I've written about it here. https://medium.com/beingwell/3-simple-steps-to-make-intermittent-fasting-an-effortless-part-of-your-life-942247ded96a

Evening: Being prepared is the way to stick to a healthy diet that will power your productivity. Slow cooking is ideal. It's cooked, piping hot and ready for your return from work regardless of how delayed you may be. Putting a recipe together is simple.

Making sure you have ingredients ready to go in the fridge, so putting supper together has as little friction as possible. Friction = snacking = junk food.

Food prep when you've got the time, energy. The weekend is a good time. I like to listen to Audible or podcasts whilst I food prep. Actually, I'm learning German during these times too! If you have a good book to listen to you'll be making batches of fermented vegetables before you can say 'sauerkraut!'.

Get the junk out of the cupboards etc. If it's not in the house you can't eat it. If you're tired, ripping open a packed of crisps is frictionless vs cooking chicken legs and rustling up a salad...