In the stomach, food tends to hang around for a little longer and this depends on a variety of factors including the amount of food you have consumed, how much fat it contains, and also the acidity of the stomach. However, all food should have left the stomach within 2 to 4 hours.
Many factors can affect body temperature. Illness, Disease and Trauma. Fever can be caused by infection or illness; this is the bodyâs way of fighting the infection. Certain diseases, such as arthritis, hyperthyroidism and leukemia may also cause elevated body temperature.
Cold or hot temperatures can slow down or increase your metabolism.  Cold decreases your metabolism but depending on the duration and  temperature of your core, can actually â¦ burn a lot of calories. Hot  temperatures cause you to sweat and increase your metabolism.