It's definitely a trend, and the handwriting is on the wall for anyone using chimpanzees in research. Public sentiment has also turned against using chimpanzees, especially in invasive studies, after decades of studies on the apes revealed their intelligent, emotional natures to be similar to our own.
Best Answer: CONCLUSION: Weight gain and elevated body weight are frequently associated with prolactinomas regardless of a mass effect on the hypothalamus or pituitary function. In this series, weight loss was recorded in 70% of prolactinomas patients and in 90% of male patients who normalized their prolactin levels. We propose the inclusion of hyperprolactinaemia in the differential diagnosis of endocrine obesity and weight gain.
1 Breast stimulation can modestly increase the amount of prolactin in the blood. 2  Chest wall trauma (for example, an injury from a car steering wheel after an accident) can lead to increased levels of prolactin.  Marijuana use is also a well documented cause of elevated levels of prolactin.