Get A Budget
Eating healthy can be difficult. Usually some of us tend to buy too much of the wrong thing and not enough of the right thing. Sometimes people that have had good dieting success, they will set a budget on how much they can spend on food. Now setting a budget may not help you to choose what foods you buy, but it can help you to make better choices and help to keep you from heading into convenience stores, fast food places or even restaurants too often.
Ultimately though no matter how much money you have, you are the one that has to make the choices. But this could be a good place to start.