Hi.... Welcome to healthcare magic. According to your complain you have problem of green stool that may be because of more iron rich food intake or other reasons. Giardia protozoa infection may cause this type of symptoms. Viral gastritis may ruled out. Gluten food intolerance problem also cause this type of symptoms. Consult a gastroenterologist for further diagnosis. Stool examination test is helpful for further diagnosis. I hope my guidance helpful to you.. Take care. Thank you.