I think the article is referring to this study. In turn, another study Dr Longo was involved in has a lengthy summary here that goes into a little more detail about the human fasting mimicking diet program, which I'd assume is the same one as described in this article. But aside from some rough percentages, the "proprietary vegetable-based soups, energy bars, energy drinks, chip snacks, chamomile flower tea, and a vegetable supplement formula tablet" seems oddly vague. Seems shorthand for "low calorie and here's a multivit".