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Stick to your list.
Avoid impulse buys. They are almost always bad, and even if it’s just a couple dollars, they will add up to $50-100 for a trip. Over the course of a year, that can mean thousands. Tell yourself you will not buy anything that’s not on your list unless it’s an absolute necessity.

Go for whole foods.
The processed kind is lacking in nutrition and will make you fat. Look for things in their least processed form whole grain instead of white or wheat bread, fresh fruit instead of canned or juice, whole grain cereal or oatmeal instead of all other kinds of cereal. You get the idea.