Certain foods really are healing foods and contain powerful medicinal properties. Below are just a few examples.
Sweet potatoes are a great source of several anti-inflammatory compounds.
Turmeric has been used in herbal practices for centuries as an anti-inflammatory. In clinical trials it has been shown to be comparable with some powerful anti-inflammatory drugs,
Ginger contains gingerols, which are also anti-inflammatories.
For Arthritis: pineapple, celery, chilli, garlic, ginger, shiitake mushroom, sweet potato, turmeric, walnuts.
Heart disease: apples, celery, chilli, garlic, ginger, onions, chickpeas, kidney beans and all other pulses.
Skin conditions: onions, artichokes, butternut squash, celery, avocado, sweet potatoes, leafy green vegetables.
Immune system: chilli, garlic, ginger, goji berries, manuka honey, pumpkin seeds, shiitake mushrooms, blueberries, mango.
Nervous system: Bananas, onions, potatoes, green vegetables, wholegrains, strawberries.
Source - Dale Pinnock
One book that was recommended reading whilst I was studying Holistic Therapy was "HEALING FOODS" which is still in print and available in good bookshops and online.