My temperature is 39.5 is this dangerous?

Depends: The temperature of 39.5 is not dangerous per se. Why your temperature is elevated could be dangerous. If the fever has lasted more than three days, it would be prudent to see a doctor. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.