It's been a slow transition for me to nearly 100% raw, although I do eat some steamed veg in the winter. I went vegan nearly 5 years ago and noticed immediate differences in my health. For one, the intense seasonal allergies that I had always suffered since childhood diminished and that first year I didn't need to take my allergy meds for the first time since I was 5 years old.
I went raw in response to a different health problem. I'd had problems with iron deficiency anemia for years, and after one year being vegan (and not the healthiest vegan either), my iron levels were so low I had nearly no iron left in my body. My doctor suggested I begin drinking green smoothies - fruit blended with leafy greens such as spinach or kale - because vitamin C doubles the absorption of iron. By googling ideas for green smoothies I came across Victoria Boutenko and her book, "Green Smoothie Revolution". I learned about the raw food diet and decided to give it a go.
Three years later I have been sick a total of once, while traveling in Cambodia. The fever lasted 24 hours. I traveled in India and was the only person in my group not to get sick, while everyone assured me that if I didn't cook my food I would get sick.
I noticed the difference in my practice immediately, and especially in my flexibility. I am more focused, calmer, enjoy greater energy and mental clarity, and am happy, where BV (before vegan), I often felt depressed, angry, and powerless to create change in my life.
There are definitely ways to do the raw diet wrong. If you are interested in introducing more raw foods into your diet I would be happy to speak to you more about it in a private message.
Hope you're having a wonderful day!