There's also a reason why if this really worked and really cured everything or even cured some anxiety or depression, everyone would be doing it, let's face it, for some reason our body's got used to these foods that aren't nutritious, but taste really good, and made the necessary changes in our system to adjust to this type of consumption(instead of hunting or eating meat and vegetables like the olden days.) or maybe our body really is suited to eating meat and vegetables.

and another thing to note is, everyone is different every one's body is different, there's a reason why some people survive and do not develop life threatening symptoms or are in any way affected by some viruses that happen to be in their body. as quoted in the road less traveled:

"An increasing number of thinkers are beginning to suggest that almost all health disorders are psychosomatic...there is a force, a mechanism of which we don't fully understand, that seems to operate routinely in most people to protect and encourage physical health even in adverse conditions."