Two Brave Men Who Ate Nothing But Meat for an Entire Year

According to that website, they did a study where 2 people were fed solely meat for a year and they came out healthier than they came in. They report no health issues at all, no worse, physically and mentally. All they ate was meat during that year, no fish. This is very intriguing to me. But how can it be? Afaik not even paleo/primal people argue for this as a healthy way of life. Shouldn't they have all kinds of issues from lack of vitamins and minerals from veggies? They did eat a large variety of meat.

What do you think? Is it a hoax or possible?