I hzve noticed twice now in about the last two weeks that my poop smells almost like metal. It's really soft and easy to poop and i haven't seen any trases of blood yet. the smell lingers for a few minutes and then goes away. I changed my diet about a month ago to a really strict carb cycling plan. i only consume fish oil pills, oats, womans vitamin, mrm, chicken, lots of veggies, almonds, eggs, flax seed, and whey protien. i also have an external pile.