Causes inflammation in lots of people.
Nightshades represent a large family of plants grown in the shade of night called Solanaceae. These vegetables and fruits contain a special substance, called alkaloids, which may be responsible for some health problems including muscle pain, morning stiffness, poor healing, acid reflux, insomnia, gallbladder problems, arthritis and other inflammatory problems. These alkaloids are produced by the plants to protect them from harmful insects. However, these substances can act like chemical substances and have strong physiological effects in humans.
Read more:
http://www.livestrong.com/article/367949-list-of-nightshade-vegetables-fruits/#ixzz2G6Zv1J00