Iron can be deficient in both dogs and cats, causing anemia, fatigue, diarrhea, pale gums, and hair loss particularly in animals fed on low meat diets. (paw-rescue.org)
This positive effect of meat was in a population with relatively low meat consumption hence the idea of the threshold effect. (nutritionfacts.org)
Does low meat consumption increase life expectancy in humans? (masteringdiabetes.org)