Hi... Welcome to healthcare magic. According to your complain you have problem of foul smell stool and loose stool that may be because of infection or other reasons. Mention other problems like pain at particular site or other abdominal problems. Do a complete blood cell count and stool examination test to check any infection present or not.. Consult a gastroenterologist for further diagnosis. Low fiber foods take also lead to this type of symptoms. Detail history and investigation give exact idea about problems. Take care. Thank you.