A little direction goes a long way when buying groceries. Having a basic plan can ensure that you've stocked up your kitchen so that making balanced meals remains simple and convenient. When I write up my grocery list I like to partition the list into the subcategories of Proteins, Carbs and Fats. Here is my last receipt broken down as an example.
4 oz Ground beef Patties (Organic, 90% Fat Free) x6
Bonless Chicken Breast (Organic, Free Range) x4
Applegate Farms Kielbasa Sausage x2
Dozen Eggs (Organic, Omega 3, Free Range)
Fage Greek Yogurt x2
Red Delicious Apples x 4
Frozen Mixed Berries
Almond Butter (.5 Pint)
Try it out for yourself and see if your grocery list is as balanced as the meals you intend to make are.