Cause: http://www.researchgate.net/publication/237823907_Anal_gas_evacuation_and_colonic_microbiota_in_patients_with_flatulence_effect_of_diet http://www.webconsultas.com/dieta-y-nutricion/nutricion-y-enfermedad/asocian-una-bacteria-con-el-aumento-de-las-flatulencias...