I started my journey with diet with the 4 Hour Body, and did the slow carb diet for 2 years. It removed all joy in food and was very difficult to maintain, however a few months into it I noticed health improvements - less asthma (turned out it was linked to dairy for me), and less runny nose. My weight normalised from 85kg to 75kg.
After doing that, I ended up doing veganism, and have done it ever since 2013. My weight normalised from 75kg to 65kg. It has been the best diet ever for me. I can eat whatever I want, and not have to worry. My partner however, is a more strict wholefood vegan diet, as she has an issue with gluten. As it turns out, right at the very end of 4 Hour Body, there is a single page to say, if you are doing veganism then you probably don’t need this book. Which was annoying.
I’ve never been a fan of fruit, but it turns out that after doing an elimination diet, it turned out that it seems I have fructose intolerance, as things with fructose in them cause me gas and the runs.
For veganism, diet, and nutrition, this book seems the best one on the matter:
That said, it would be worth getting a blood test every 6 months to make sure your diet is hitting your needs. And with a vegan diet, like any diet, there are many ways to do it properly and to do it terribly. So doing blood tests is a good way forward. If you’d like to defer the research to someone else, then perhaps consult a nutritionist (as nutrition is their job).
My wife recommends this nutritionist highly: