I've been vegan for 2.5+ years, with a good 1.5 of those years as a whole food, plant based vegan. I expected to see some minor health improvements when I switched to this way of eating. However, my modest expectations were significantly exceeded.
My osteoarthritis pain in my toe from a sports injury over 20 years ago has essentially disappeared and has not returned. I sleep great. I feel great. I am the lightest weight I have ever been in my adult life. My airways are clearer than ever before - I can breath through my nose at night. I don't need alcohol or caffeine to keep me happy and motivated, respectively (I've largely quit both and I don't miss it at all). I feel mentally content most of the time (some of which is attributed to supplementing with ashwagandha, an adaptogenic herbal supplement from Chinese Medicine). My blood test at each of my annual physical exams has provided empirical proof that the whole food, plant based diet is ideal for maximal, if not optimal, health.
The only physical issue I have is some pain in my left knee when I go on long bike rides. But this pain is mild and resides almost as soon as I am done with the exercise.
I can't speak highly enough of adopting a whole food, plant based diet for health and wellness. The experimental case study will continue for the foreseeable future and I will report back periodically. But, the evidence thus far is clear: A whole food, plant based diet can't hurt, and it might help.
Good day.