Summer is right around the corner, which means plenty of time spent outdoors soaking up the sun and warmer temperatures. Whether you’re having a picnic, sitting by the pool, or spending a day at the lake, it’s time to drink more water. If you aren’t careful, dehydration can occur quickly. Losing just 1% to 2% of your body’s water can affect your functioning and lead to life-threatening complications if you don’t act fast. Here are 5 subtle signs of dehydration to watch for to ensure nothing dampers your summer plans.