Too much fat especially animal fat will not cause problems immediately. If you continue to take such diet then the fat starts to deposit in the abdominal area and there will be increase in the bad cholesterol levels which can speed up the process of atherosclerosis. This process can block arteries of heart causing coronary artery disease, arteries of brain causing carotid arteries disease and arteries of kidneys causing peripheral artery disease. All these conditions are life threatening.