When buying produce, buy what you eat, and eat what you buy. Splurging on fruits and vegetables that you don't like and won't eat will not make you healthy or save you money. Purchase fresh fruits and veggies in amounts that you know you can consume within several days.
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Watch for sales on frozen fruits and vegetables, which have a much longer lifespan than fresh produce. Frozen berries are a great addition to a homemade smoothie, and frozen veggies warm up quickly for a healthy side dish.