6. Trans fats
Trans fats are the least healthy fats you can eat. These solid fats originated as healthier, liquid vegetable oils but were hydrogenated to form a solid fat that can cause many health problems. Avoid these completely. Trans fats can raise your triglyceride level and low-density lipoprotein level (LDL) (otherwise known as your bad cholesterol), increasing your risk for a heart attack. Trans fats are linked to prostate cancer, heart disease, diabetes, and Alzheimer’s disease.