Here is a useful well-referenced article that lists the nightshades and explains a lot more about them for you. Consider it particularly if you suffer from chronic pain, especially muscle and joint pain as nightshades are very linked to arthritic-type conditions.:

The Link Between Nightshades, Chronic Pain and Inflammation

Here, for ease, is the full nightshade list with a few comments where relevant from me. Note specifically the info about GM soya; I was fascinated that it appears to be ‘cut’ with the petunia plant, a known nightshade. No-one is suggesting you have to get rid of all of these although it may be necessary if you are in chronic pain to trial off all of them, of course, to see if it lowers.

The nightshade list

• ­ tomatoes (all varieties, including tomatillos) 

• ­ potatoes (all varieties, NOT sweet potatoes or yams) these first two are the main avoiders, not least because they are lectins too.

• ­ eggplant (aubergine)

• ­ okra                                                      

• ­ peppers (all varieties such as bell pepper, wax pepper, green & red peppers, chili peppers, cayenne, paprika, etc.)

• ­ goji berries very good for you in antioxidant terms; I haven’t found a problem with them and use ‘em in my muffins.

• ­ tomarillos (a plum-like fruit from Peru)

• ­ sorrel

• ­ garden huckleberry & blueberries (contain the alkaloids that induce inflammation) 
  

• ­ gooseberries

• ­ ground cherries ground?? Wonder why..

• ­ pepino Melon

• ­ the homeopathic “Belladonna”   [note: this is highly precautionary as homeopathics contain virtually no measurable “active” chemical]                                                          

• ­ tobacco

• ­ paprika 

• ­ cayenne pepper

Soy sauce made in the U.S. is generally made with genetically modified (GMO) soy beans, which are cut with the nightshade plant Petunia.

The condiments black/white pepper and pepper corns are not nightshades