A new study returns to link diets with too many fatty foods, for example ketogenic diets, to cardiovascular health problems according to a new hypothesis, that of the immune response to the diet.
According to a London study commissioned by the  British Heart Foundation and with the collaboration of Queen Mary University of London , too many fatty foods in the diet would be linked to a greater number of heart attack risks due to an inflammatory response that would increase T lymphocytes in the blood.

In fact, the study failed to find a causal linkbetween a diet that is too high in fat and an increase in T lymphocytes in humans, limiting instead to recording that people with more visceral body fat had more T lymphocytes than people of normal weight. And that in mice a diet too rich in fatty foods creates the same inflammatory response, triggering T lymphocytes ( source ).

Another study instead links the massive consumption of fatty foods, typical of ketogenic diets, to a worsening of glucose sensitivity in men especially: according to Dr.  Matthew Cocks of Liverpool John Moores University, in men a diet too rich in fatty foods can lead to a worsening of blood glucose, and in general a lower affinity for carbohydrate metabolism. This is despite the fact that carbohydrates are very low ( source ).