• The main problems arise for several possible reasons.a) High glycaemic index.b) Common cause of problems associated with allergy such as fatigue, IBS, migraine, depression, skin disorders, asthma and candida.c) They contain lectins - see Lectins - Natural Toxins found in some grains and some vegetablesd) They contain endogenous opiate mimics which may be a problem in susceptibles eg autistics.e)