5. Dehydration
You may think of something like dehydration as a relatively harmless condition that is easily remedied by drinking more water. That may be true for mild cases, but the type of serious dehydration that can result from working out excessively without drinking enough liquid or using pills for “water weight” loss can be deadly. Dehydration causes the heart to work harder simply because of the lack of fluid lowers the available supply of blood it pumps throughout the body. As the heart works extra hard to make up for the deficit, it is more prone to failure, which is another way of saying you are at higher risk for heart attack.