My biggest problem with this study is that it is not a controlled study. It states in the abstract that it's an observational study, which means it's not testing any hypothesis. There are no controls, the people who follow this diet know they're doing it. Not only that but the way they go about it is placebo on steroids. In the methods it states that they gave people Halleluya Acres writings which is raw vegan propaganda of a religious nature. So they gave these people propaganda that says all health problems are caused by eating animal products and processed food and then they proceed to do the best they can to follow the recommended dietary regimen for a few weeks, and they say they subjectively feel better. I'm trying to think of a softer way to look at dietary intervention and I can't think of one.
The whole idea of an intervention study is to not induce a placebo effect, and this group turns that idea on it's head by giving to the subjects propaganda saying what they're about to do will cure them. I find it hard to believe that a group of scientists couldn't find the time or had the writing skills to cobble together a raw vegan dietary regimen for their subjects themselves and had to rely on a religious propaganda booklet. The more I think about it the more I find this study one of the worst I've ever read. I just checked where it was published, an alternative medicine journal. I bet they have some high standards for scientific rigor over there. I just realized now there's two studies, the Hallelejah Acres and the Hippocrates Health Institute.
So in the one study they give the subjects information that says if they follow this diet they will get better and lo and behold the subjects say they feel better after a few weeks. Then in the other one they find that people who went to a health resort had better mood after. Well that about proves it huh, who has ever heard of someone going to a resort for three weeks and having an improved mood afterwards? It must be the raw vegan diet, not the fact that they aren't at work, taking care of kids, making their own meals etc. Seriously both of those studies are beyond rubbish imo.