White peaches and nectarines have several characteristics that set them apart from their yellow counterparts. They have a delicate white flesh and an incredibly sweet taste due to their low acid levels. Acid is what gives yellow peaches and nectarines their slightly tangy flavor. As yellow varieties ripen, some of this acid dissipates, leaving a nice balance of sugar and acid. Because white peaches and nectarines have very low acid, they have the same sweet flavor whether you eat them crisp like an apple or wait for them to become soft and juicy.