A liquidated damages clause sets an amount in a contract in the event of a breach. A liquidated damages clause isn't a penalty, though it may sound like one. A penalty is usually disproportionate to the actual harm, and is meant to punish or deter breaching a contract.
Acidic stools can be caused from absorption problems from the diet and foods you eat. Some people have acidic stools as a result of a lactose intolerance.
Contrary to popular belief, eating acidic foods will not cause one's stomach, blood, or entire body to become more acidic. In fact, during the process of digestion, the stomach secretes hydrochloric acid (HCl), a super-duper acidic substance that causes its contents to become acidic.