(1) Constant body temperature. When we have a cold and a fever, we often feel poor appetite and spirit. This is because the temperature rise affects the catalytic function of digestive enzymes and other enzymes, leading to the disorder of physiological activities such as indigestion.
(2) Blood sugar balance. When we don't eat for a long time, we often feel weak and dizzy, which is caused by insufficient glucose supply and brain energy.
(3) Osmotic pressure balance. When suffering from gastroenteritis, we often feel weak in our limbs. The reason is that we lose a lot of inorganic salts in our body, which destroys the balance of inorganic salts, so we need infusion to supplement them.