How low? A temperature slightly, up to 1 degree F, lower than the "normal" is okay if you have no symptoms. You may consult this site for more information on this topic: http://www.webmd.com/first-aid/body-temperature For 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.