These two paragraphs are very confusing:<p>> <i>In the early 20th Century, Arctic explorer Vilhjalmur Stefansson spent a collective five years eating just meat. This meant that his diet consisted of around 80% fat and 20% protein. Twenty years later, he did the same as part of a year-long experiment at the New York City’s Bellevue Hospital in 1928.</i><p>> <i>Stefansson wanted to disprove those who argued that humans cannot survive if they only eat meat. But unfortunately for him, in both settings he very quickly became ill when he was eating lean meats without any fat. He developed "protein poisoning”, nicknamed “rabbit starvation”. His symptoms disappeared after he lowered his protein intake and he raised his fat intake. In fact, after returning to New York City and to a typical US diet with more normal levels of protein, he reportedly found his health deteriorating and returned to a low-carb, high fat, and high protein diet until his death aged 83.</i><p>This doesn't seem like an anecdote about <i>too much protein</i>, it seems like an anecdote about <i>too little fat</i>. Wikipedia's article <a href="https://en.wikipedia.org/wiki/Protein_poisoning" rel="nofollow">https://en.wikipedia.org/wiki/Protein_poisoning</a> confirms that this is the right interpretation, and mentions (as this article does, later) that there is no point at which you can get poisoned by too much protein consumption, as long as you are also consuming enough fat.<p>Wikipedia goes into more detail about the experiment at Bellevue. The two types of diets he was on were a) all meat, with fat and b) all lean meat (analogous to eating solely rabbits, which are naturally lean and have little fat, hence the name). Diet A was fine; diet B was not.<p>The article's phrasing "a typical US diet with more normal levels of protein" implies that the levels were <i>higher</i> than his previous diet, which caused him problems again. It seems pretty implausible for the standard US diet of the '20s and '30s to be higher-protein than either of these all-meat diets! And the article does mention he returned to a "high protein" diet. It seems like the more reasonable reading is that the important part was that his diet was "low-carb, high fat," which the typical US diet was and is not.