My biggest issue historically has been lack of consistency, most of which has been life-distraction related. I'll decide to take it serious, start doing the stuff, then we'll go on a trip and get out of routine, come back, and I'll completely forget. The good news is that over the last few years I've built up some approaches that don't feel super difficult to adhere to, which I can return to.
My daily meal types can be broken down into 3 categories. Here are the heuristics for each:
Snacking: Make sure we're stocked with the right groceries.
Eating Out: Order small low calorie meals - soup, sides etc. Eat dinner at home
Dinner: Eat Khan's Kitchen meals
150g protein
Little-to-no processed foods
Rough calorie calculation each day
No food after 5 (for better sleep)
Do groceries at start of week
Exercise 3x/week
Diet soda is allowed
Food idea catalog is here.