New Delhi, Jan. 26 -- There are health risks associated with every season, and winter is no exception. As the temperature drops, people tend to focus more on common illnesses like cold, fevers, and allergies. However, doctors warn heart patients to take extra caution because cold weather increases the risk of heart attacks more than other seasons do. One of the causes of heart attacks in winter is dehydration caused by a lack of water intake. In addition to increasing the risk of heart attacks, dehydration can affect your immune system, digestion, bone and joint health. If you tend to avoid drinking water during winter, you should know that it can cause headaches, constipation and even a decline in cognitive function. Here's how to increa...