A runner doesn't gain speed by running a once or twice in a week.
A person won't increase muscle or lose fat by working with a personal trainer once every couple weeks in an otherwise sedentary lifestyle.
An overweight person will not lose weight by adding in a couple salads a week to a diet that still includes a plenty of dinners out and lots of refined starchy and fatty foods.
The not-so-magical magic for achieving results is consistency.
It's consistency over a period of weeks and months that leads into years where real results are achieved and maintained. Success in achieving a goal is the sum of all the small efforts in support of your goals, repeated day after day after day.
The more often you practice the skills that support a healthy diet--planning your meals, shopping to stock a health-promoting pantry + fridge, and preparing simple + nutrient-packed meals--the easier it gets and the more consistent you become.
This is where a health coach like myself can be a tremendous asset, providing practical resources, but perhaps even more importantly accountability.
Got a goal? Be consistent in your efforts toward achieving it! And be in touch if you need support (which may or may not include a kick in the ass when your efforts don't support your goals).