It’s that happy time of year when peaches, nectarines, plums, plumcots, cherries, and apricots are at their peak. There are plenty of sweet reasons to take a bite: All these fruits are filled with fiber, vitamin C, and the antioxidants lutein and zeaxanthin. But each variety is a nutritional standout in its own way too. Cherries are particularly high in potassium, an electrolyte that helps regulate fluid balance and muscle and nerve function, and cherries and plums get their bright hues from anthocyanins, powerful antioxidants. Plumcots (also called pluots) and apricots are rich in vitamin A, which is crucial to good eye health. And nectarines and peaches contain folate, a key player in energy production, as well as beta-carotene, another type of antioxidant, which gives their juicy flesh a yellow-orange…