When it comes to bread being bad, there are some pretty obvious signs. Visible signs of mold or white, black, blue, or green spots on the bread are a sure sign it has spoiled and you should discard it. If your store-bought bread smells sour (like vinegar), yeasty, or even like alcohol, get rid of it too
Acidity occurs when there is excess secretion of acids in the gastric glands of the stomach. When the secretion is more than usual, we feel, what is commonly known as heartburn, which is normally triggered off by consumption of spicy foods.