> Regarding the mechanisms underlying the correlation between low carbohydrate diets and death, Professor Banach noted that animal protein, specifically red and processed meat, has already been linked with an increased risk of cancer. He said: “The reduced intake of fibre and fruits and increased intake of animal protein, cholesterol, and saturated fat with these diets may play a role. Differences in minerals, vitamins and phytochemicals might also be involved.”

I wouldn't be surprised if most people doing keto have way, way less fiber than they should.