During the scorching summer, you sweat a lot. So it would be wise for you to have some vinegar to improve the density of your hydrochloric acid (a strong acid that can assist with the digestion of protein and kill bacteria) to sharpen your appetite. Otherwise, vinegar results to peeling off dead skin cells. As it inhibits germs,it can also kill pyococcus (a germ that may cause human or animals' organs to fester), and prevent intestinal diseases, such as typhoid fever (a serious infectious disease that is caused by dirty food or drink) and dysentery (a serious disease of one's bowels that makes them bleed and pass much more waste than usual). During the summer, when you easily get tired or feel sleepy, it is advisable to have a little vinegar to refresh yourself. It also can relieve summer-heat.