> it is "spend considerable amount of time thinking about and planning your eating".
Nonsense. It doesn't take any more time. Just buy unprocessed, basic food, fruit and veg. When you open your cupboard, cook something tasty from what you have.
When you go to the supermarket, just don't walk into the aisles with snacks. Don't buy anything laden with sugar and fat.
Get into the habit of drinking black coffee instead of Starbucks' calorific drinks; it takes less than a week for your taste buds to adjust.
It's not rocket science. Just most people don't want to admit that every excess 100 calories they eat adds 11 grams of fat to their middle. Which adds up week by week, year by year.