See if your favorites made the list.Credit: KucherAV / Getty ImagesKey TakeawaysFunctional foods—like berries, nuts, seeds, and avocado—offer extra health perks beyond basic nutrition, helping support heart health, digestion, and overall wellness.Gut-friendly options such as fermented foods, Greek yogurt, and pre- or probiotic sodas are especially popular for improving digestion and immune function.Adding a variety of these nutrient-dense foods …