The difference is that food is (uncountable) any substance that can be consumed by living organisms, especially by eating, in order to sustain life while groceries are all commodities that are sold by a grocery store.
As Infobwana, we are going to give you a few tips on how to make a well-planned grocery list. One that will get you in and out of the store quickly and help you stick to your healthy eating plan. When you use these tips, you'll have a blueprint for a cart full of groceries that won't bust your budget or diet.
Breakfast & Cereals
Canned, Jarred, & Pouched Foods
Grains, Pasta & Sides
Baking & Cooking Supplies
Condiments & Salad Dressings
In the Refrigerator
In the Freezer