Potatoes Contain Lectins
Lectins serve as a primitive pest-resisting strategy in potatoes. However, the structure of lectins, makes them almost impossible for humans to digest. Lectins in potatoes are powerful toxins found in many genetically engineered crops that causes “Leaky Gut” and increased inflammation in the gut, which can lead to many autoimmune diseases and other health ailments, according to sources.
Sources:
http://thepaleodiet.com/are-potatoes-paleo/
http://www.livestrong.com/article/463973-the-effects-of-too-much-starch-in-a-diet/