This video from TEDX featuring Dr. Terry Wahls made the rounds several months ago and is fascinating to watch. The good doctor suffered from multiple sclerosis, an auto-immune disorder that attacks the brain and spinal cord. The form Dr Wahls had was so virulent that it made her completely wheelchair bound.
In desperation, she re-hauled her diet after stumbling across paleo on the Internet. She started to fix her body at the cellular level using nutrient dense foods like grass-fed meats, vegetables, seaweed, fruits and organ meats (so nutritious yet so hated by Westerners).
NOT eating certain types of foods likely helped just as much as increasing her intake of nutrient dense food. She does not eat grains, sugars or dairy.
I really like this passage from her talk. It deserves to be quoted in full:
I am the canary in the coal mine, here as a warning to all of you. We have a choice. We can continue to eat that delicious, convenient, tasty processed food and watch ourselves and our children grow steadily more depressed, overweight and diabetic.
Or, we can continue to watch health care costs balloon out of control, bankrupting us individually and collectively as a country.
Or, we can eat for our mitochondria, eating vegetables and berries, organic grass fed meat, and seaweed, and have more vitality.
One person I know who was not moved by my entreaties, nor by the examples of people I helped, nor by the articles I sent him about achieving health via nutrient dense foods, nor by the books that influenced me, actually got convinced to jump on board and adopt this way of eating after watching this video.
It is that powerful.