Learning about diets and food is also terribly difficult because the internet and books are so full of people who are so dead certain about their pseudo science. There is so much emotion attached to food that getting an objective rational opinion on anything food related is next to impossible. Personally I like the Soylent creators take on it. He seems extremely focused on figuring out the objective truths and ignore all the wishy washy emotional bullshit.
And also with so many eating exclusively the soylent mixture which is easy to control what goes into, they got an excellent opportunity to study many hypothesis about food. E.g. how important is it to eat "live fresh food" vs just getting the micro nutrients in the right mix.