2.Dark-colored foods --sometimes dark-colored foods turn your poop black. These include: chocolate sandwich cookies, blueberries, grape juice, beets, spinach etc. The dark color should go away once you stop eating the food that caused it.
3.Bleeding ulcer- a bleeding ulcer is the most common cause of dark stools. An ulcer is a sore on the inside of your stomach or small intestine. Sometimes these sores bleed. This can make your poop dark.
4.Esophageal and gastric cancers
you can do stool exam from some lab to confirm
in the meanwhile follow this 1. Take your breakfast every day. Don't skip it. U should eat whatever your mother or grandparent eat in bfast. I mean to say whatever is your traditional food. If punjabi eat paratha, if belongs to south then take idli/ dosa etc. (preferably within 10 mins of waking up). No only biscuits or rusk will not do. 2. Don't overeat 3. Don't take tea empty stomach. Eat something like a banana (if you are not diabetic) or any seasonal fruit or soaked almonds and a glass of plain water first thing in the morning
4. Have light meals every 2 hours (in addition to your breakfast, lunch n dinner) e.g. Nariyal paani, chaach, a handful of dry fruits, a handful of peanuts, any fresh n seasonal fruit (eat whole fruit not juice), a cup of curd/milk etc
5. Take simple food like rice n dal in dinner. Finish your dinner at least 2 hours before going to sleep.
6. Maintain active life style7. Avoid fast foods, spicy n fried foods, carbonated beverages
8. Take a lot of green vegetables n fruit. 9. Drink lot of water.10. Everyday preferably sleep on same time
exercise in the form of yoga, cycling, swimming, gym etc.
Homeopathy is a very effective for this problem n has very encouraging results. And homeopathic medicines are safe and do not have any side effects at all.