The pancreas is a long flattened gland located deep in the belly (abdomen). It secretes hormone called Insulin. This hormone regulates sugar level in our body. Hypo secretion of this hormone increases sugar level in our body and a disease called Diabetes is caused. Diabetic patients are advised not to consume more sugar. Pineal gland is a small gland which is situated in our brain. Pineal gland secretes hormone called Melatonin. This hormones regulates our sleep cycle and other such processes. It also regulates secretion of sex hormones.