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.
1 Fever is most often a symptom of an infection but can also be caused by inflammatory conditions, thyroid disease, cancer, vaccines and some drugs. 2  Temperature is regulated by a small gland located in the center of the brain, the hypothalamus. 3  The thyroid gland also plays a role in body temperature.