Lectins are proteins in plants that potentially cause inflammation and weight gain A California cardiologist first promoted the idea of cutting out lectin foods for weight loss and better health But lectins are found in lots of otherwise-healthy foods, including vegetables, beans, grains, nuts, and seeds. Experts agree that most people might miss crucial nutrients if they try a lectin-free dietKeto, paleo, gluten-free. There's always an "it" diet...